jquery2.0.3 全部源码

/*!
 * Includes Sizzle.js    选择器，独立的库
 * http://sizzlejs.com/
 */
(function( window, undefined ) {
//"use strict";
var
	// rootjQuery = jQuery(document) = $();压缩有用
	rootjQuery,

	// dom是否加载完
	readyList,

	// core_strundefined == 'undefined'
	core_strundefined = typeof undefined,

	// Use the correct document accordingly with window argument (sandbox)
	location = window.location,
	document = window.document,
	docElem = document.documentElement,

	// 接受外部对jQuery，$的改变，报讯在_jQuery，_$中，
	_jQuery = window.jQuery,
	_$ = window.$,

	//class2type = { '[Object String]' : 'string' , '[Object Array]' : 'array' }
	class2type = {},

	// 没有用处
	core_deletedIds = [],

	core_version = "2.0.3",

	// 将对象方法的地址保存在变量中，后面用call调用。
	/*
	var	core_deletedIds = [],
	 core_version = "2.0.3",
	 core_push = core_deletedIds.push,
	 core_trim = core_version.trim;
	 alert(core_push);
	function F(){
		this.pu = core_push;
		this.tr = core_trim;
		this.ar = new Array();
		this.df = function(){}
	}
	var f1 = new F();
	core_push.call(f1.ar,1,2,3,4);
	f1.pu.call(f1.ar,1,2,3,4)
	//f.ar.core_push(1,2,3,4);  //f.ar没有core_push方法
	alert(f1.ar.toString());

	var f2 = new F();
	alert(f2.pu === f1.pu);//TRUE
	alert(f2.df === f1.df);//false
	alert(f2.tr === f1.tr);//TRUE
	alert(f2.ar === f1.ar);//false

	function F(){
		this.a = 1;
		this.f = function(){alert(2);}
	}
	var f1 = new F();
	var f2 = new F();
	alert(f1.f == f2.f);//false
	var f1f = f1.f;

	function N(){
		this.f = f1f;
	}
	var n1 = new N();
	var n2 = new N();
	alert(n1.f == n2.f);//true
	alert(n1.f === n2.f);//true
	*/
	core_concat = core_deletedIds.concat,
	core_push = core_deletedIds.push,
	core_slice = core_deletedIds.slice,
	core_indexOf = core_deletedIds.indexOf,
	core_toString = class2type.toString,
	core_hasOwn = class2type.hasOwnProperty,
	core_trim = core_version.trim,

	// []表示任意一个，？表示0、1个，\d表示数字，*表示任意多个，.单个非回车换行的字符，\.字符点，|是或者，\d*\.| 数字加小数点或者什么都没有，[eE]科学计数法
	core_pnum = /[+-]?(?:\d*\.|)\d+(?:[eE][+-]?\d+|)/.source,

	// \S是空格，按照空格分割成数组
	core_rnotwhite = /\S+/g,

	// 正则中不加g的时候，会把整体匹配到还会匹配整项，?:表示外层的括号不是子项，小括号是2个子项，
	//match = ['#div1',null,'div1'];  //$('#div1')
	rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]* | #([\w-]*))$/,

	// 匹配空标签<p></p>
	rsingleTag = /^<(\w+)\s*\/?>(?:<\/\1>|)$/,

	// Matches dashed string for camelizing
	rmsPrefix = /^-ms-/,
	rdashAlpha = /-([\da-z])/gi,

	// Used by jQuery.camelCase as callback to replace()
	fcamelCase = function( all, letter ) {
		return letter.toUpperCase();
	},

	//匿名函数全局作用域，dom加载完成执行的方法
	completed = function() {
		document.removeEventListener( "DOMContentLoaded", completed, false );
		window.removeEventListener( "load", completed, false );
		jQuery.ready();
	};

	/*
	function Aaa(){
	}
	Aaa.prototype.init = function(){
	};
	Aaa.prototype.css = function(){
	};
	var a1 = new Aaa();
	a1.init();//prototype里的方法一般用对象调用
	a1.css();

	function jQuery(){
		return new jQuery.prototype.init();//返回init类的对象
	}
	jQuery.prototype.init = function(){
	};
	jQuery.prototype.css = function(){
	};
	jQuery.prototype.init.prototype = jQuery.prototype;//init类的原型等于jQuery的原型，init对象就可以使用jQuery原型里的方法
	//外部使用
	jQuery().css();

	*/

// $() == jQuery(),这个函数返回对象，
jQuery = function( selector, context ) {
	//jQuery.fn=jQuery.prototype={init:function(){}},fn就指向prototype,init就是prototype里面的方法，一般用类的对象来调用。
	//jQuery()、$()返回的是init()类的对象，并且执行了init函数里面的方法，执行初始化。
	//$(),jQuery()传的参数都是传给了init()方法里面去了
	return new jQuery.fn.init( selector, context, rootjQuery );
	},
jQuery.fn.init.prototype = jQuery.fn;//init类的原型等于jQuery的原型，init对象就可以使用jQuery原型里的方法

jQuery.fn = jQuery.prototype = {			//给类jQuery增加静态属性fn,修改函数的prototype并增加属性和方法
	jquery: core_version,

	constructor: jQuery,//不回指就是object
	//$("a,b,c")都是调用的是init方法，new init(a,b,c),
	//$('li','ul')//选择ul下面的li,
	//return new jQuery.fn.init()，init函数执行，如果有return就返回return里面的东西（return的要是引用对象，否则返回init类的实例对象）。
	init: function( selector, context, rootjQuery ) {
		var match, elem;

		// $(""), $(null), $(undefined), $(false) 判空
		if ( !selector ) {
			return this;//返回init函数类的对象
		}

		// $('#div1') $('.box') $('div')  $('#div1 div.box') $('<li>')  $('<li>1</li><li>2</li>')//创建字符串标签，$('li','ul')//选择ul下面的li, 都是strings类型。
		if ( typeof selector === "string" ) {
			if ( selector.charAt(0) === "<" && selector.charAt( selector.length - 1 ) === ">" && selector.length >= 3 ) {
				// 标签<p>，match是进来的时候定义的，拼接数组，
				//$('<li>')   $('<li>1</li><li>2</li>')
				//match = [ null, '<li>', null ];
				//match = [ null, '<li>1</li><li>2</li>', null ];
				match = [ null, selector, null ];

			} else {
				/*不是标签，$('#div1') $('.box') $('div')  $('#div1 div.box') $('<li>hello')
				rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]* | #([\w-]*))$/,
				match = null;  //$('.box') $('div')  $('#div1 div.box')
				match = ['#div1',null,'div1'];  //$('#div1')
				match = ['<li>hello','<li>',null];  //$('<li>hello')
				*/
				match = rquickExpr.exec( selector );
			}

			// 创建标签或者根据id查找，$('<li>')  $('#div1')
			if ( match && (match[1] || !context) ) {

				//创建标签 $('<li>')
				if ( match[1] ) {
					//第二个参数context是创建标签的上下文，$('<li>',$(document))，用于iframe中，
					context = context instanceof jQuery ? context[0] : context;

					// $('<li>1</li><li>2</li>').appendTo( ' ul ' );
					//merge方法 把 $('<li>1</li><li>2</li>')变成json = {0 : 'li',1 : 'li',length : 2},return this就是这个json并返回出去，就可以appendTo到ul上了。$()返回你需要的任意类型this对象。
					jQuery.merge( this, jQuery.parseHTML(
					//parseHTML方法把<li>1</li><li>2</li>变成li数组[li,li]，match = [ null, '<li>1</li><li>2</li>', null ];
					//new的时候this指的是本类对象，
						match[1],
						context && context.nodeType ? context.ownerDocument || context : document,
						true
					) );

					// 添加标签并且加属性，$('<li></li>',{title : 'hi',html : 'abcd',css : {background:'red'}}).appendTo( 'ul' );
					//rsingleTag正则匹配单标签。<li>、<li></li>可以，<li></li><li></li>不行，isPlainObject判断第二个参数是json
					if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
						for ( match in context ) {
						// {html:abcd},this[html]是一个函数，就执行这个函数this[html]('abcd'),
							if ( jQuery.isFunction( this[ match ] ) ) {
								this[ match ]( context[ match ] );

							// {title:'hi'}，this.attr(title,'hi')，
							} else {
								this.attr( match, context[ match ] );
							}
						}
					}

					return this;

				// $('#div1') ，id选择器，match = ['#div1',null,'div1'];
				} else {
					elem = document.getElementById( match[2] );//根据id获取element,

					//Blackberry 4.6仅仅判断elem存在是不行的，还要判断他父节点存在
					if ( elem && elem.parentNode ) {
						// Inject the element directly into the jQuery object
						this.length = 1;
						this[0] = elem;//给对象添加属性名为0值为elem,this[0]设置获取值，不能通过this.0设置获取值。
						/*
						function F(a){
							return new init();//this是F对象
						}
						function init(a){
							this.length = 1;
							this[0] = document.getElementById("a");
							alert(this[0].innerHTML);
							return this;
						}
						var f = F();
						alert(f[0].innerHTML);
						*/
					}

					this.context = document;
					this.selector = selector;//'#div1'
					return this;
				}

			// HANDLE: $(expr, $(...))   $('.box') $('div')  $('#div1 div.box')
			//jquery: core_version = "2.0.3",
			} else if ( !context || context.jquery ) {
				//context不存在或者context存在且context的jquery存在，是jquery对象
				//( context || rootjQuery )context存在不走后面，rootjQuery  = jQuery(document),context.find()  或者  rootjQuery.find
				//$('ul',$(document)).find('li');走这里，$(document)是init对象有jquery属性，jquery是init方法的属性，就是判断context是不是init对象或者说jQuery对象。
				return ( context || rootjQuery ).find( selector );

			// HANDLE: $(expr, context)
			// (which is just equivalent to: $(context).find(expr)
			} else {
				//context存在并且context的jquery属性不存在,不是jQuery对象，构造一个jquery对象
				//$('ul',document).find('li');走这里
				//constructor: jQuery，constructor就是jQuery函数，jQuery(document).find，window.$ = jQuery;相当于$(document).find,
				//constructor和函数名一样，都是指的是函数地址，
				return this.constructor( context ).find( selector );
			}

		// selector !== "string" : $(DOMElement)，$(this)  $(document)
		} else if ( selector.nodeType ) {//节点都有nodeType属性
			this.context = this[0] = selector;
			this.length = 1;
			return this;

		// HANDLE: $(function)  $(function(){})
		//$(function(){}) 是后面的简写 $(document).ready(function(){});
		} else if ( jQuery.isFunction( selector ) ) {
			// rootjQuery = jQuery(document);
			return rootjQuery.ready( selector );
		}
		//$([])  $({})  $( $('#div1') ) ===  $('#div1') ，如果传的是jquery对象$('#div1') ，selector = $('#div1')，$('#div1')这个对象有selector属性，selector.selector === '#div1'，
		if ( selector.selector !== undefined ) {
			this.selector = selector.selector;//'#div1'
			this.context = selector.context;//document
		}

		return jQuery.makeArray( selector, this );//把类似于数组的转成真正的数组，
	},

	// 选择到的元素的字符串
	selector: "",

	// $('') 返回的new init(),是init对象，或者init方法中返回的引用对象，对象中元素的个数，
	length: 0,

	//jQuery函数原型的方法，jQuery函数对象的方法，makeArray是jQuery extend的方法
	// $('div')) : json对象 Object { 0: <div>, 1: <div>, 2: <div>, 3: <div>, length: 4, prevObject: Object, context: HTMLDocument → new%202.html, selector: "div" }
	//$('div').toArray() : Array [ <div>, <div>, <div>, <div> ]
	toArray: function() {//json转数组
		return core_slice.call( this );
	},

	// $('div').get(-1).innerHTML = '222222222'，$('div')是jQuery返回的this对象，$('div').get()返回的是div的数组，this[ num ]中括号除了数组的下标还可以代表json或者对象的属性。
	get: function( num ) {
		return num == null ?this.toArray() :
			( num < 0 ? this[ this.length + num ] : this[ num ] );
	},

	// Take an array of elements and push it onto the stack (returning the new matched element set)
	//$('div').pushStack( $('span') )   $('span').prevObject -> $('div')
	pushStack: function( elems ) {
		/*
		jQuery = function() {
			alert(1);
			return new jQuery.fn.init();
		},
		jQuery.fn = jQuery.prototype = {//fn是类的静态属性
		//能够调用jQuery原型里（constructor()、pushStack()）方法的只能是jQuery对象或者init对象:$('div')。
				constructor: jQuery,
				init: function() {
				},
				//$('div').pushStack，this是$('div')，
				pushStack: function() {
					alert(2);
					this.constructor();//1,  this是init对象或者jQuery对象$('div')，返回的是新的空init对象
					constructor();//constructor.call(window),调不了报错，
				},
		}
		jQuery.fn.init.prototype = jQuery.fn;
		var j = constructor();//window调用不了
		$('div').pushStack();//1,2,1, $('div')是init对象可以调用pushStack()方法
		o = {}
		o.pushStack();//o.pushStack is not a function,能够调用pushStack方法是jQuery的对象后者init对象，
		new jQuery.fn.init().pushStack();//2 1
		*/
		//this是调用pushStack方法的对象，能够调用pushStack和constructor()方法的只有jQuery的对象后者init对象，这里this是$('div')（json格式），this.constructor()返回的是新的空参数的init对象（有jQuery原型的属性和方法以及init函数类的属性方法）
		var ret = jQuery.merge( this.constructor(), elems );//返回span集合，elems = $('span')
		ret.prevObject = this;//this = $('div')，$('span').prevObject -> $('div')
		ret.context = this.context;
		return ret;//将$('span')返回出去
		/*
		$('div').pushStack( $('span') )，pushStack()返回span，span的prevObject等于div，css('background','red')只会把span变红，
		end: function() {
			return this.prevObject || this.constructor(null);
		},
	调用end方法就是返回prevObject就实现了栈，多次调用end()，最后返回空,就不处理最后的css方法。

	$('div').pushStack( $('span') ).css('background','red').end().end().end().css('background','yellow');
	*/
	},

	//加强版的for循环，each是原型的方法，就是对象的方法，
	each: function( callback, args ) {
		return jQuery.each( this, callback, args );//这个each是jQuery.extend({})加进去的，

	},

	ready: function( fn ) {
		jQuery.ready.promise().done( fn );
		return this;
	},
	/*
		core_slice = core_deletedIds.slice,		core_deletedIds = [],
		$('div').slice(1,3)返回2.3两个div,他的prevObject = $('div')（4个div），css('background','red')就是把2个div变红，end().css('color','blue')把4个div变蓝。

		$('div').slice(1,3).css('background','red').end().css('color','blue');
	*/
	slice: function() {
		return this.pushStack( core_slice.apply( this, arguments ) );
	},

	first: function() {
		return this.eq( 0 );
	},

	last: function() {
		return this.eq( -1 );
	},
//$('div').eq(0).css('background','red');
	eq: function( i ) {
		var len = this.length,//4个div
			j = +i + ( i < 0 ? len : 0 );
		return this.pushStack( j >= 0 && j < len ? [ this[j] ] : [] );//返回div[0],div[0].prevObject = $('div')（4个div）,
	},
	/*var arr = ['a','b','c'];
	arr = $.map(arr,function(elem,i){
		return elem + i;
	});
	alert( arr );//[a0,b1,c2]*/
	map: function( callback ) {
		return this.pushStack( jQuery.map(
										this,
										function( elem, i ) {
											return callback.call( elem, i, elem );
										}
									)
							   );
		 },

	end: function() {
		return this.prevObject || this.constructor(null);
	},

	//内部使用，把数组的方法挂载到了jQuery对象上了，
	push: core_push,//core_push = core_deletedIds.push,core_deletedIds = [],
	sort: [].sort,
	splice: [].splice
};

//给jQuery类添加静态方法extend，给jQuery的原型添加方法就是添加对象的方法
		/*
			$.extend({     //给jQuery类加静态方法
				aaa : function(){
					alert(1);
				},
				bbb : function(){
					alert(2);
				}
			});

			$.fn.extend({     //给jQuery对象加方法
				aaa : function(){
					alert(3);
				},
				bbb : function(){
					alert(4);
				}
			});
			$.aaa();//1
			$.bbb();//2
			$().aaa();//3
			$().bbb();//4
$.extend();  -> this -> $（jQuery类）  -> this.aaa  ->  $.aaa()
$.fn.extend(); -> this -> $.fn（jQuery原型对象） -> this.aaa ->  $().aaa()
			//当写多个对象自变量的时候 , 后面的对象都是扩展到第一个对象身上
			var a = {};
			$.extend( a , { name : 'hello' } , { age : 30 } );
			console.log( a );//  { name : 'hello'  ,  age : 30 }	

			深拷贝浅拷贝
		*/
jQuery.extend = jQuery.fn.extend =
{function() {
	//extend继承方法的定义，extend就是给自变量的对象或者jQuery类jQuery对象扩展另一个对象的属性。就是涉及到深拷贝浅拷贝。
	var options, name, src, copy, copyIsArray, clone,
//默认目标元素是第一个参数，arguments[0]，i = 1,不做深拷贝deep = false;
//var a = {};$.extend( a , { name : 'hello',age:12 } , { ss : 30 }
		target = arguments[0] || {},//第一个参数
		i = 1,
		length = arguments.length,
		deep = false;//默认是浅拷贝

	/*  深拷贝
		var a = {};
		var b = {  name : { age : {nn:14} } };
		$.extend( true,a , b );
		*/
	if ( typeof target === "boolean" ) {//判断第一个参数是不是布尔值
		deep = target;//true 深拷贝
		target = arguments[1] || {};//目标元素是第二个参数
		i = 2;//目标元素是第二个参数
	}

	// 第一个元素不是对象也不是函数，是string或其他，有可能是深拷贝，设置目标元素是空对象
	if ( typeof target !== "object" && !jQuery.isFunction(target) ) {
		target = {};
	}

	// 只有一个参数，$.extend({aaa : function(){alert(1);},bbb : function(){alert(2);})，$.fn.extend({aaa : function(){alert(1);},bbb : function(){alert(2);})
});
	if ( length === i ) {
		target = this;//目标参数就是this，this是$或者$.fn，this指的是函数时候代表函数体，
		--i;//i=0
	}

	//多个参数，循环把每个对象赋值到第一个对象，
	//1.var a = {};$.extend( a , { name : 'hello',age:12 } , { ss : 30 } );target=a,deep = false,i = 1,
	//2.$.extend({aaa : function(){alert(1);},bbb : function(){alert(2);}),i=0,deep = false
	//3.1.var a = {}; var b = {  name : {age : {nn:14} } }; $.extend( true,a , b );deep = true,target=a={},i = 2
	for ( ; i < length; i++ ) {
		//1.判空，不能是$.extend( a , null , null ); 1.options是第i个json，
		//2.options={aaa : function(){alert(1);},bbb : function(){alert(2);}
		//3.1.options= {  name : { age : {nn:14} } }
		if ( (options = arguments[ i ]) != null ) {
			//1.遍历第i个json,{ name : 'hello',age:12 }
			for ( name in options ) {
				//1.target = a = {},src = a[name] = null,a[age] = null,a[ss]=null
				//2.$[aaa]=null=src,target=$,$[bbb]=null=src
				//3.1.a[name]=src=null,
				src = target[ name ];
				//1.copy = 'hello' copy=12 copy=30
				//2.copy=function(){alert(1);},copy=function(){alert(2);},
				//3.1.copy={age : {nn:14} }
				copy = options[ name ];

				// 1. $.extend( a , { name : a } )防止这种情况
				//2.$.extend({aaa : $,bbb : $)防止这种情况
				//3.1.$.extend( true,a , {name:a} )
				if ( target === copy ) {
					continue;
				}

				// 深拷贝
				//3.1.isPlainObject判断json键对应的值是不是对象，或者数组
				//copy这个键的值是对象
				if ( deep && copy && ( jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)) ) ) {
					//src = target[ name ] 如果存在，target[ name ] = jQuery.extend( deep, target[ name ], copy );
					if ( copyIsArray ) {
						copyIsArray = false;
						clone = src && jQuery.isArray(src) ? src : [];

					} else {
						/*3.1.3 clone=false
						var a = { name : { job : 'it' } };
						var b = { name : {age : {n:10}} };
						$.extend( true , a  , b );
						src = { job : 'it' }
						a = { name : { job : 'it' ,{age : {n:10}}} };
						*/
						clone = src && jQuery.isPlainObject(src) ? src : {};
					}

					// 3.递归
					//3.1.a[name]=jQuery.extend( true, {}, {age : {nn:14} } )
					//3.1.2 a[name]=jQuery.extend( true, { job : 'it' }, {age : {n:10}})
					//3.1.2 a[age]=jQuery.extend( true, {}, {n:10} )={n:10},a={job : 'it',age : {n:10}}
					//3.1.3 a[name] = jQuery.extend( true, { job : 'it' }, {age : {n:10}} );   target={job : 'it'}  target[age]=jQuery.extend( deep, {}, {n:10} );target={}  target[n]=10 return{n:10},target[age]={n:10},target={job : 'it',age : {n:10}} return target，a[name]={job : 'it',age : {n:10}}
					target[ name ] = jQuery.extend( deep, clone, copy );

				//浅拷贝target[ name ] = copy;copy是一个对象的时候就是传递的地址，
				} else if ( copy !== undefined ) {
					//1.a[name] = 'hello' a[age] = 12 a[ss]=30 a={name:'hello',age:12,ss:30}
					//2.$[aaa]=function(){alert(1);},$[bbb]=function(){alert(2);}
					target[ name ] = copy;
				}
			}
		}
	}
	return target;
}
};
jQuery.extend({//调用extend方法，给jQuery函数增加静态方法，js中直接通过$调用，不需要jquery对象。

	// 唯一随机字符串，replace( /\D/g, "" )把非数字小数点变为空，例如数据缓存做唯一操作
	expando: "jQuery" + ( core_version + Math.random() ).replace( /\D/g, "" ),
/*
<script>
var $ = 123;
var jQuery = 456;
js源码里面有	_jQuery = window.jQuery,_$ = window.$，接受外部的改变，保存在_$ = 123，_jQuery=456
</script>
<script src="jquery-203.js"></script>
<script>
var miaov = $.noConflict(true);
</script>
*/
	noConflict: function( deep ) {
		if ( window.$ === jQuery ) {//一定相等
			window.$ = _$;//window.$ = 123，jQuery就放弃$了，使用miaov,
		}

		if ( deep && window.jQuery === jQuery ) {//一定相等
			window.jQuery = _jQuery;//window.jQuery = 456，jQuery就放弃jQuery了，使用miaov,
		}

		return jQuery;
	},

	// Is the DOM ready to be used? Set to true once it occurs.
	isReady: false,

	// A counter to track how many items to wait for before
	// the ready event fires. See #6781
	readyWait: 1,

	/*
	$.getScript('a.js',function(){//动态加载js,异步加载，有可能alert(2)先于a.js加载完
	});
	$(function(){
		alert(2);
	});
	-----------------------------------------
	$.holdReady(true);
	$.getScript('a.js',function(){//动态加载js,异步加载
		$.holdReady(false);//a.js加载完后回调函数执行，释放hold，保证先加载a.js，然后弹出alert(2)
	});
	$(function(){
		alert(2);
	});
	*/
	holdReady: function( hold ) {
		if ( hold ) {
			jQuery.readyWait++;//readyWait是将要加到jQery函数的属性，加完之后调用这个方法就可以使用这个变量，holdReady调用多次，readyWait++多次
		} else {
			jQuery.ready( true );//下面
		}
	},

	//$.ready()  Handle when the DOM is ready
	ready: function( wait ) {

		// --jQuery.readyWait不为0就继续等
		if ( wait === true ? --jQuery.readyWait : jQuery.isReady ) {
			return;
		}

		// isReady是给jQuery类扩展的静态属性
		jQuery.isReady = true;

		// If a normal DOM Ready event fired, decrement, and wait if need be
		if ( wait !== true && --jQuery.readyWait > 0 ) {
			return;
		}

		// If there are functions bound, to execute
		readyList.resolveWith( document, [ jQuery ] );

		// Trigger any bound ready events
		if ( jQuery.fn.trigger ) {
			jQuery( document ).trigger("ready").off("ready");
		}
	},

	// See test/unit/core.js for details concerning isFunction.
	// Since version 1.3, DOM methods and functions like alert
	// aren't supported. They return false on IE (#2968).
	isFunction: function( obj ) {
		return jQuery.type(obj) === "function";
	},

	isArray: Array.isArray,

	isWindow: function( obj ) {// $.isWindow(window)，通过$调用。js中window有2个作用，1是充当全部对象，2是做浏览器窗口，只有window才有window属性并且等于window。如果obj是undefined、null，undefined === undefined.window=undefined，null === null.window=undefined，所以要判断obj不是undefined或者null（obj != null）。
		return obj != null && obj === obj.window;//undefined是等于null的，null是等于null的，undefined.window返回null，null.window返回null，
	},

	//不能用typeof,alert( typeof NaN );//number
	isNumeric: function( obj ) {
		//parseFloat(obj) 可以转的是数字，不可以转的返回NaN，
		//isFinite是原生的方法，判断是不是有限的数字，alert( isFinite( Number.MAX_VALUE + Number.MAX_VALUE ) );//false
		return !isNaN( parseFloat(obj) ) && isFinite( obj );
	},

	type: function( obj ) {
		if ( obj == null ) {//obj = null或者undefined
			return String( obj );//'undefined'，'null'
		}
		//core_toString = {}.toString，
		//alert( {}.toString.call([]));//[object Array]这个判断类型最全
		//jQuery.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) { class2type[ "[object " + name + "]" ] = name.toLowerCase(); });将[object Array]简写成array
		return typeof obj === "object" || typeof obj === "function" ?
			class2type[ core_toString.call(obj) ] || "object" :
			typeof obj;
	},

	//判断是否对象自变量
	isPlainObject: function( obj ) {
		//jQuery.type( obj ) !== "object"  不是基本类型
		//obj.nodeType 是一个dom节点，jQuery.type(dom节点)返回object,不是对象自变量，window也不是对象自变量，jQuery.type(window)返回object
		if ( jQuery.type( obj ) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
			return false;
		}
		//jQuery.type( window.location) 返回object,不是基本类型不是节点不是window，
		//有constructor属性，core_hasOwn = {}.hasOwnProperty方法,obj.constructor.prototype有没有isPrototypeOf属性，
		try {
			if ( obj.constructor &&
					!core_hasOwn.call( obj.constructor.prototype, "isPrototypeOf" ) ) {
				return false;
			}
		} catch ( e ) {
			return false;//狐火下执行次数过多会报错
		}

		//{},new Object(),
		return true;
	},

	//是否为空对象{},[],没有自身的属性和方法(有原型属性也可以遍历出来，不是空对象)
	isEmptyObject: function( obj ) {
		var name;
		for ( name in obj ) {
			return false;
		}
		return true;
	},

	error: function( msg ) {// $.error('这是错误');
		throw new Error( msg );
	},

	/* keepScripts = true, 可以解析script标签
	把 $('<li>1</li><li>2</li>')变成this = {0 : 'li',1 : 'li',length : 2}，data = [ null, '<li>1</li><li>2</li>', null ];
	/*
	var str = '<li></li><li></li>';
	$.parseHTML(str); 返回li的数组
	/*[li, li]
	0: li
	1: li
	length: 2
	__proto__: Array(0) //

	var str = '<li></li><li></li><script><\/script>';
	$.parseHTML(str,document,true);
	//
	[li, li, script]
	0: li
	1: li
	2: script
	length: 3
	__proto__: Array(0)
	//
	*/
	parseHTML: function( data, context, keepScripts ) {
		if ( !data || typeof data !== "string" ) {//存不存在，是不是字符串
			return null;
		}
		if ( typeof context === "boolean" ) {//第二个参数就是布尔值，就当第三个参数用，第二个参数是false,
			keepScripts = context;
			context = false;
		}
		context = context || document;//执行上下文只能是document,这个document可以是当前页面的也可以是iframe的，
		var parsed = rsingleTag.exec( data ),//判断是不是单标签<li></li>,<li></li><li></li>是多标签
			scripts = !keepScripts && [];

		// 单标签，创建这个标签，返回数组，
		if ( parsed ) {
			return [ context.createElement( parsed[1] ) ];//context是执行上下文，是document对象，创建element和getelement前面都需要这个对象来调用方法而已。
		}
//多标签，创建dom标签节点
		parsed = jQuery.buildFragment( [ data ], context, scripts );

		if ( scripts ) {//keepScripts=true,不删除script标签，keepScripts=false,删除script标签。
			jQuery( scripts ).remove();
		}

		return jQuery.merge( [], parsed.childNodes );
	},

	//json格式字符串转json,IE678不支持，
	parseJSON: JSON.parse,

	// Cross-browser xml parsing，解析xml，出了json解析还有xml解析，xml是最早的数据形式，后来才有的json,以前都是xml。
	parseXML: function( data ) {
		var xml, tmp;
		if ( !data || typeof data !== "string" ) {//不存在不是string
			return null;
		}

		// Support: IE678不支持，支持IE9。IE678出错了不会进入catch,而是创建一个xml携带<parsererror>错误的信息</parsererror>
		try {
			tmp = new DOMParser();//创建解析xml的对象，最早火狐支持，后来都开始支持了。
			xml = tmp.parseFromString( data , "text/xml" );
		} catch ( e ) {
			xml = undefined;//data必须是完整的xml,不能是html,
		}

		if ( !xml || xml.getElementsByTagName( "parsererror" ).length ) {
			jQuery.error( "Invalid XML: " + data );
		}
		return xml;
	},

	noop: function() {},

	// Evaluates a script in a global context，全局解析js，
	/*
	function test() {
		jQuery.globalEval( "var newVar = true;" )
		var newVar1 = true;
	}
	test();
	alert( newVar );
	alert( newVar1 );

	function test(){
		var i = eval;
		i('var a = 1');
		eval('var b = 2');
		window.eval('var c = 3');
		alert( "s"+a );
		alert( "s"+b );
		alert( "s"+c );

	}
	test();
	alert( a );//1
	alert( b );//buxing
	alert( c );//3
	*/
	globalEval: function( code ) {
		var script,
				indirect = eval;

		code = jQuery.trim( code );//去前后空格

		if ( code ) {
			// 创建script标签，加文本，加入到head中，删除script标签
			if ( code.indexOf("use strict") === 1 ) {
				script = document.createElement("script");
				script.text = code;
				document.head.appendChild( script ).parentNode.removeChild( script );
			} else {
				indirect( code );//eval来解析
			}
		}
	},

	// 把css样式转成js能够接受的，比如js不能接受横杆
	/*
	(function(){
		var a,b=1,c=2;//全局闭包作用域，内部都可以通过闭包链来找到这个外部变量
		var f = function(o){
			for(i in o){
				alert(i+"--"+o[i]());//camelCase--3
			}
		}
		f({
			camelCase: function( string ) {
				return b+c;
			},
		})
	})()
	*/
	//margin-top ->  marginTop  -ms-transform -> msTransform -moz-transform -> MozTransform
	//rmsPrefix = /^-ms-/, rdashAlpha = /-([\da-z])/gi,	fcamelCase = function( all, letter ) { return letter.toUpperCase(); },
	camelCase: function( string ) {
		return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase );
	},
	/*
	replace后面传递函数：
	rmsPrefix = /^-ms-/;
	rdashAlpha = /-([\da-z])/gi;
	fcamelCase = function( all, letter ) {
		alert(all);//-t,正则匹配到的整体
		alert(letter);//t,正则里面的子项
		return letter.toUpperCase();
	};
	camelCase=function( string ) {
			var d = string.replace( rmsPrefix, "ms-" );//ms-transform
			var g = d.replace( rdashAlpha, fcamelCase );//msTransform
			return g;
		},
	alert(camelCase('-ms-transform'));
	*/

	//判断节点的名字是不是指定的名字
	nodeName: function( elem, name ) {
		return elem.nodeName && elem.nodeName.toLowerCase() === name.toLowerCase();
	},

	// args is for 内部使用
	/**
	var arr = ['a','b','c','d'];
	var json = { name : 'hello' , age : 20 };
	$.each(json , function(i,value){//下标  每一个值
		alert(value);
		return false;//return false了,只执行一次
	});
	*/
	each: function( obj, callback, args ) {
		var value,
			i = 0,
			length = obj.length,//数组有长度，json没有长度，也有可能json里面有一个length属性，
			isArray = isArraylike( obj );//是不是类数组或者真正数组

		if ( args ) {//内部使用，平时不传
			if ( isArray ) {
				for ( ; i < length; i++ ) {
					value = callback.apply( obj[ i ], args );

					if ( value === false ) {
						break;
					}
				}
			} else {
				for ( i in obj ) {//遍历json
					value = callback.apply( obj[ i ], args );

					if ( value === false ) {
						break;
					}
				}
			}

		// A special, fast, case for the most common use of each
		} else {
			if ( isArray ) {//数组
				for ( ; i < length; i++ ) {//回调函数
					value = callback.call( obj[ i ], i, obj[ i ] );

					if ( value === false ) {//回调函数返回值是false就不循环了
						break;
					}
				}
			} else {//json
				for ( i in obj ) {
					value = callback.call( obj[ i ], i, obj[ i ] );

					if ( value === false ) {
						break;
					}
				}
			}
		}

		return obj;
	},

	trim: function( text ) {
		return text == null ? "" : core_trim.call( text );
	},

	// 类似于数组转成真正数组
	/*
	var s = 123;
	console.log( $.makeArray( s ) );//[123]
	console.log( $.makeArray( s , {length:3} ) );//Object {3: 123, length: 4}

	var str = {1:1,2:2};
	console.log( $.makeArray( str ) );//[{1:1,2:2}]
	console.log( $.makeArray( str , {length:3} ) );//{3:{1:1,2:2},length: 4}
	*/
	makeArray: function( arr, results ) {
		var ret = results || [];

		if ( arr != null ) {
			/*Object()将基本类型转成对应的对象类型。
console.log(Object(123));//Number {[[PrimitiveValue]]: 123}
console.log(Object('abc'));//String {0: "a", 1: "b", 2: "c", length: 3, [[PrimitiveValue]]: "abc"}
console.log(Object(true));//Boolean {[[PrimitiveValue]]: true}
			*/
			if ( isArraylike( Object(arr) ) ) {//'hello'走这里，
				jQuery.merge( ret,
					typeof arr === "string" ?
					[ arr ] : arr
				);
			} else {//123走这里
				core_push.call( ret, arr );
			}
		}

		return ret;
	},

	/*	indexof
	var arr = ['a','b','c','d'];
	alert( $.inArray( 'w' , arr ) );
	core_indexOf = [].indexOf,   		*/
	inArray: function( elem, arr, i ) {//i是从哪里开始查
		return arr == null ? -1 : core_indexOf.call( arr, elem, i );
	},

	/*
	$.merge(['a','b'],['c','d']);//["a", "b", "c", "d"]
	$.merge(['a','b'],{0:'c',1:'d'});//["a", "b", "c", "d"]
	$.merge({0:'a',1:'b',length:2},{0:'c',1:'d'});//{0: "a", 1: "b", 2: "c", 3: "d", length: 4}
	$.merge({0:'a',1:'b',length:2},['c','d']);// {0: "a", 1: "b", 2: "c", 3: "d", length: 4}
	*/
	merge: function( first, second ) {
		var l = second.length,
			i = first.length,
			j = 0;
		//	$.merge( ['a','b'],['c','d'] );
		if ( typeof l === "number" ) {//json的length不是number，
			for ( ; j < l; j++ ) {
				first[ i++ ] = second[ j ];
			}
		} else {// $.merge( ['a','b'],{0:'c',1:'d'} );
			while ( second[j] !== undefined ) {
				first[ i++ ] = second[ j++ ];//second的json的属性还必须是0.1.2
			}
		}
		first.length = i;
		return first;
	},

	/*
	var arr = [1,2,3,4];
	arr = $.grep( arr , function( n , i ){//n是每一项，i是下标
		return n>2;
	} , true );
	console.log( arr );//[1,2]
	*/
	grep: function( elems, callback, inv ) {
		var retVal,
			ret = [],
			i = 0,
			length = elems.length;
		inv = !!inv;//2个！就把undefined转成false
		for ( ; i < length; i++ ) {
			retVal = !!callback( elems[ i ], i );//2个！就把不是布尔类型的转成相应的布尔值
			if ( inv !== retVal ) {
				ret.push( elems[ i ] );
			}
		}

		return ret;
	},

	/*
	var arr = [1,2,3,4];
	arr = $.map( arr , function(n){
		return [n+1];
	} );
	console.log( arr );//[2,3,4,5]
	*/
	map: function( elems, callback, arg ) {
		var value,
			i = 0,
			length = elems.length,
			isArray = isArraylike( elems ),
			ret = [];
		if ( isArray ) {
			for ( ; i < length; i++ ) {
				value = callback( elems[ i ], i, arg );
				if ( value != null ) {
					ret[ ret.length ] = value;//末尾追加
				}
			}
		} else {//json
			for ( i in elems ) {
				value = callback( elems[ i ], i, arg );
				if ( value != null ) {
					ret[ ret.length ] = value;
				}
			}
		}
		// ret = [[2],[3],[4],[5]]
		return core_concat.apply( [], ret );//[2,3,4,5]
	},

	// A global GUID counter for objects
	guid: 1,

	/*
	function show(n1,n2){
		alert(n1);
		alert(n2);
		alert(this);
	}
	show();//window
	$.proxy(show,document)(3,4);//改变show的this是document,执行，
	$.proxy(show,document,3)(4);//改变show的this是document,执行，
	$.proxy(show,document,3)//不执行
	*/
	proxy: function( fn, context ) {
		var tmp, args, proxy;
		//var obj = {show : function(){}};
		//$(document).click( $.proxy(obj,'show') );//让obj下面的show指向obj
		if ( typeof context === "string" ) {
			context = fn;//context = obj
			fn = tmp;//fn = show
			//变成了$.proxy(show,obj)，统一参数格式
		}

		if ( !jQuery.isFunction( fn ) ) {
			return undefined;
		}

		// 第3个参数3,
		args = core_slice.call( arguments, 2 );
		proxy = function() {//返回的是函数，后面小括号表示这个函数体执行，
			return fn.apply( context || this, args.concat( core_slice.call( arguments ) ) );
			//[].slice.call( arguments )把arguments转成真正的数组，arguments是后面的参数
		};

		// 后期处理事件
		proxy.guid = fn.guid = fn.guid || jQuery.guid++;

		return proxy;
	},

	// 内部使用，
	/*
	alert( $('#div1').css('width') );
	$('#div1').css('background','yellow');
	$('#div1').css(''yellow');
	$('#div1').css('width','300px');
	$('#div1').css({ background : 'yellow' , width : '300px' });
	*/
	/*attr: function( 'title', 'hello' ) {
		jQuery.access( this, jQuery.attr, 'title', 'hello', arguments.length > 1 );
	  }
	*/
	access: function( elems, fn, key, value, chainable, emptyGet, raw ) {

		//elems=$('#div1')，fn是回调函数，key=background，value=yellow，chainable为真表示设置值为假表示设置值，
		var i = 0,
			length = elems.length,
			bulk = key == null;///没有key就是true，

		//设置多组值：..css({ background : 'yellow' , width : '300px' })
		//是object就是json,
		if ( jQuery.type( key ) === "object" ) {
			chainable = true;
			for ( i in key ) {
				jQuery.access( elems, fn, i, key[i], true, emptyGet, raw );
			}
		// 设置一组值：$('#div1').css('width','300px');
		} else if ( value !== undefined ) {
			chainable = true;///不设置就是undefined
			if ( !jQuery.isFunction( value ) ) {
				raw = true;
			}
			if ( bulk ) {///没有key
				if ( raw ) {///不是函数
					fn.call( elems, value );
					fn = null;
				} else {///是函数，函数现在不执行，套上一层，里面return时候调用函数
					bulk = fn;
					fn = function( elem, key, value ) {
						return bulk.call( jQuery( elem ), value );
					};
				}
			}

			if ( fn ) {
				for ( ; i < length; i++ ) {
					//jQuery.attr()
					fn( elems[i], key, raw ? value : value.call( elems[i], i, fn( elems[i], key ) ) );
				}
			}
		}

		//chainable是真就是设置值，
		return chainable ?
			elems :

			// Gets
			bulk ?///有没有key值
				fn.call( elems ) :///有key就调用
				length ? fn( elems[0], key ) : emptyGet;///又要分长度
	},

	now: Date.now,

	/*
	alert( $('#div1').width() );//display:none还是获取到了，利用的是swap方法
	alert( $('#div1').get(0).offsetWidth );//原生的宽度方法，display:none就获取不到了
	*/
	swap: function( elem, options, callback, args ) {
		var ret, name,
			old = {};//老的样式

		// Remember the old values, and insert the new ones
		for ( name in options ) {
			old[ name ] = elem.style[ name ];//存老的样式
			elem.style[ name ] = options[ name ];//设置新的样式
		}

		ret = callback.apply( elem, args || [] );//调用函数获取想要的属性值

		// Revert the old values
		for ( name in options ) {
			elem.style[ name ] = old[ name ];//样式还原
		}

		return ret;
	}
});
}
/* $(function(){}) -->  rootjQuery.ready(function(){})  -->  $(document).ready(function(){})  --> $().ready(function(){}) --> jQuery.ready.promise().done( function(){} )
		----------->  addEventListener --> jQuery.ready() --> readyList.resolveWith( document, [ jQuery ] );
		----------->  readyList.promise( obj ) -->
ready: function( fn ) {
	jQuery.ready.promise().done( fn );
	return this;
},  */
jQuery.ready.promise = function( obj ) {
	if ( !readyList ) {//是否加载完，刚开始是false,只走进来一次，

		readyList = jQuery.Deferred();

		if ( document.readyState === "complete" ) {//dom加载完document的属性是完成状态，
			// Handle it asynchronously to allow scripts the opportunity to delay ready
			setTimeout( jQuery.ready );

		} else {

			/*匿名函数全局作用域，dom加载完成执行的方法
			completed = function() {
				document.removeEventListener( "DOMContentLoaded", completed, false );
				window.removeEventListener( "load", completed, false );
				jQuery.ready();
				  jQuery.ready() --> readyList.resolveWith( document, [ jQuery ] );
			};
			*/
			document.addEventListener( "DOMContentLoaded", completed, false );

			// A fallback to window.onload, that will always work
			window.addEventListener( "load", completed, false );
		}
	}
	return readyList.promise( obj );
};

// Populate the class2type map
jQuery.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) {
	class2type[ "[object " + name + "]" ] = name.toLowerCase();
});

//是不是数组，特殊数组，带length属性的json
function isArraylike( obj ) {
	var length = obj.length,
		type = jQuery.type( obj );

	if ( jQuery.isWindow( obj ) ) {//是不是window，下面的判断有可能window也满足，
		return false;
	}

	if ( obj.nodeType === 1 && length ) {//一组元素节点是类数组
		return true;
	}
	//type !== "function"不加这个，那么有length属性的函数就进去了
	return type === "array" || type !== "function" &&
		( length === 0 ||
		typeof length === "number" && length > 0 && ( length - 1 ) in obj );
}

// All jQuery objects should point back to these
rootjQuery = jQuery(document);
/////////////////////////////////////////Sizzle BEGIN////////////////////////
{
/*!
 * Sizzle CSS Selector Engine v1.9.4-pre
 * http://sizzlejs.com/
 *
 * Copyright 2013 jQuery Foundation, Inc. and other contributors
 * Released under the MIT license
 * http://jquery.org/license
 *
 * Date: 2013-06-03
 */
(function( window, undefined ) {

var i,
	support,
	cachedruns,
	Expr,
	getText,
	isXML,
	compile,
	outermostContext,
	sortInput,

	// Local document vars
	setDocument,
	document,
	docElem,
	documentIsHTML,
	rbuggyQSA,
	rbuggyMatches,
	matches,
	contains,

	// Instance-specific data
	expando = "sizzle" + -(new Date()),
	preferredDoc = window.document,
	dirruns = 0,
	done = 0,
	classCache = createCache(),
	tokenCache = createCache(),
	compilerCache = createCache(),
	hasDuplicate = false,
	sortOrder = function( a, b ) {
		if ( a === b ) {
			hasDuplicate = true;
			return 0;
		}
		return 0;
	},

	// General-purpose constants
	strundefined = typeof undefined,
	MAX_NEGATIVE = 1 << 31,

	// Instance methods
	hasOwn = ({}).hasOwnProperty,
	arr = [],
	pop = arr.pop,
	push_native = arr.push,
	push = arr.push,
	slice = arr.slice,
	// Use a stripped-down indexOf if we can't use a native one
	indexOf = arr.indexOf || function( elem ) {
		var i = 0,
			len = this.length;
		for ( ; i < len; i++ ) {
			if ( this[i] === elem ) {
				return i;
			}
		}
		return -1;
	},

	booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped",

	// Regular expressions

	// Whitespace characters http://www.w3.org/TR/css3-selectors/#whitespace
	whitespace = "[\\x20\\t\\r\\n\\f]",
	// http://www.w3.org/TR/css3-syntax/#characters
	characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",

	// Loosely modeled on CSS identifier characters
	// An unquoted value should be a CSS identifier http://www.w3.org/TR/css3-selectors/#attribute-selectors
	// Proper syntax: http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
	identifier = characterEncoding.replace( "w", "w#" ),

	// Acceptable operators http://www.w3.org/TR/selectors/#attribute-selectors
	attributes = "\\[" + whitespace + "*(" + characterEncoding + ")" + whitespace +
		"*(?:([*^$|!~]?=)" + whitespace + "*(?:(['\"])((?:\\\\.|[^\\\\])*?)\\3|(" + identifier + ")|)|)" + whitespace + "*\\]",

	// Prefer arguments quoted,
	//   then not containing pseudos/brackets,
	//   then attribute selectors/non-parenthetical expressions,
	//   then anything else
	// These preferences are here to reduce the number of selectors
	//   needing tokenize in the PSEUDO preFilter
	pseudos = ":(" + characterEncoding + ")(?:\\(((['\"])((?:\\\\.|[^\\\\])*?)\\3|((?:\\\\.|[^\\\\()[\\]]|" + attributes.replace( 3, 8 ) + ")*)|.*)\\)|)",

	// Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter
	rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),

	rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
	rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ),

	rsibling = new RegExp( whitespace + "*[+~]" ),
	rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*)" + whitespace + "*\\]", "g" ),

	rpseudo = new RegExp( pseudos ),
	ridentifier = new RegExp( "^" + identifier + "$" ),

	matchExpr = {
		"ID": new RegExp( "^#(" + characterEncoding + ")" ),
		"CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
		"TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
		"ATTR": new RegExp( "^" + attributes ),
		"PSEUDO": new RegExp( "^" + pseudos ),
		"CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace +
			"*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
			"*(\\d+)|))" + whitespace + "*\\)|)", "i" ),
		"bool": new RegExp( "^(?:" + booleans + ")$", "i" ),
		// For use in libraries implementing .is()
		// We use this for POS matching in `select`
		"needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" +
			whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" )
	},

	rnative = /^[^{]+\{\s*\[native \w/,

	// Easily-parseable/retrievable ID or TAG or CLASS selectors
	rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,

	rinputs = /^(?:input|select|textarea|button)$/i,
	rheader = /^h\d$/i,

	rescape = /'|\\/g,

	// CSS escapes http://www.w3.org/TR/CSS21/syndata.html#escaped-characters
	runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ),
	funescape = function( _, escaped, escapedWhitespace ) {
		var high = "0x" + escaped - 0x10000;
		// NaN means non-codepoint
		// Support: Firefox
		// Workaround erroneous numeric interpretation of +"0x"
		return high !== high || escapedWhitespace ?
			escaped :
			// BMP codepoint
			high < 0 ?
				String.fromCharCode( high + 0x10000 ) :
				// Supplemental Plane codepoint (surrogate pair)
				String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
	};

// Optimize for push.apply( _, NodeList )
try {
	push.apply(
		(arr = slice.call( preferredDoc.childNodes )),
		preferredDoc.childNodes
	);
	// Support: Android<4.0
	// Detect silently failing push.apply
	arr[ preferredDoc.childNodes.length ].nodeType;
} catch ( e ) {
	push = { apply: arr.length ?

		// Leverage slice if possible
		function( target, els ) {
			push_native.apply( target, slice.call(els) );
		} :

		// Support: IE<9
		// Otherwise append directly
		function( target, els ) {
			var j = target.length,
				i = 0;
			// Can't trust NodeList.length
			while ( (target[j++] = els[i++]) ) {}
			target.length = j - 1;
		}
	};
}

function Sizzle( selector, context, results, seed ) {
	var match, elem, m, nodeType,
		// QSA vars
		i, groups, old, nid, newContext, newSelector;

	if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
		setDocument( context );
	}

	context = context || document;
	results = results || [];

	if ( !selector || typeof selector !== "string" ) {
		return results;
	}

	if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
		return [];
	}

	if ( documentIsHTML && !seed ) {

		// Shortcuts
		if ( (match = rquickExpr.exec( selector )) ) {
			// Speed-up: Sizzle("#ID")
			if ( (m = match[1]) ) {
				if ( nodeType === 9 ) {
					elem = context.getElementById( m );
					// Check parentNode to catch when Blackberry 4.6 returns
					// nodes that are no longer in the document #6963
					if ( elem && elem.parentNode ) {
						// Handle the case where IE, Opera, and Webkit return items
						// by name instead of ID
						if ( elem.id === m ) {
							results.push( elem );
							return results;
						}
					} else {
						return results;
					}
				} else {
					// Context is not a document
					if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
						contains( context, elem ) && elem.id === m ) {
						results.push( elem );
						return results;
					}
				}

			// Speed-up: Sizzle("TAG")
			} else if ( match[2] ) {
				push.apply( results, context.getElementsByTagName( selector ) );
				return results;

			// Speed-up: Sizzle(".CLASS")
			} else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
				push.apply( results, context.getElementsByClassName( m ) );
				return results;
			}
		}

		// QSA path
		if ( support.qsa && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) {
			nid = old = expando;
			newContext = context;
			newSelector = nodeType === 9 && selector;

			// qSA works strangely on Element-rooted queries
			// We can work around this by specifying an extra ID on the root
			// and working up from there (Thanks to Andrew Dupont for the technique)
			// IE 8 doesn't work on object elements
			if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
				groups = tokenize( selector );

				if ( (old = context.getAttribute("id")) ) {
					nid = old.replace( rescape, "\\$&" );
				} else {
					context.setAttribute( "id", nid );
				}
				nid = "[id='" + nid + "'] ";

				i = groups.length;
				while ( i-- ) {
					groups[i] = nid + toSelector( groups[i] );
				}
				newContext = rsibling.test( selector ) && context.parentNode || context;
				newSelector = groups.join(",");
			}

			if ( newSelector ) {
				try {
					push.apply( results,
						newContext.querySelectorAll( newSelector )
					);
					return results;
				} catch(qsaError) {
				} finally {
					if ( !old ) {
						context.removeAttribute("id");
					}
				}
			}
		}
	}

	// All others
	return select( selector.replace( rtrim, "$1" ), context, results, seed );
}

/**
 * Create key-value caches of limited size
 * @returns {Function(string, Object)} Returns the Object data after storing it on itself with
 *	property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength)
 *	deleting the oldest entry
 */
function createCache() {
	var keys = [];

	function cache( key, value ) {
		// Use (key + " ") to avoid collision with native prototype properties (see Issue #157)
		if ( keys.push( key += " " ) > Expr.cacheLength ) {
			// Only keep the most recent entries
			delete cache[ keys.shift() ];
		}
		return (cache[ key ] = value);
	}
	return cache;
}

/**
 * Mark a function for special use by Sizzle
 * @param {Function} fn The function to mark
 */
function markFunction( fn ) {
	fn[ expando ] = true;
	return fn;
}

/**
 * Support testing using an element
 * @param {Function} fn Passed the created div and expects a boolean result
 */
function assert( fn ) {
	var div = document.createElement("div");

	try {
		return !!fn( div );
	} catch (e) {
		return false;
	} finally {
		// Remove from its parent by default
		if ( div.parentNode ) {
			div.parentNode.removeChild( div );
		}
		// release memory in IE
		div = null;
	}
}

/**
 * Adds the same handler for all of the specified attrs
 * @param {String} attrs Pipe-separated list of attributes
 * @param {Function} handler The method that will be applied
 */
function addHandle( attrs, handler ) {
	var arr = attrs.split("|"),
		i = attrs.length;

	while ( i-- ) {
		Expr.attrHandle[ arr[i] ] = handler;
	}
}

/**
 * Checks document order of two siblings
 * @param {Element} a
 * @param {Element} b
 * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
 */
function siblingCheck( a, b ) {
	var cur = b && a,
		diff = cur && a.nodeType === 1 && b.nodeType === 1 &&
			( ~b.sourceIndex || MAX_NEGATIVE ) -
			( ~a.sourceIndex || MAX_NEGATIVE );

	// Use IE sourceIndex if available on both nodes
	if ( diff ) {
		return diff;
	}

	// Check if b follows a
	if ( cur ) {
		while ( (cur = cur.nextSibling) ) {
			if ( cur === b ) {
				return -1;
			}
		}
	}

	return a ? 1 : -1;
}

/**
 * Returns a function to use in pseudos for input types
 * @param {String} type
 */
function createInputPseudo( type ) {
	return function( elem ) {
		var name = elem.nodeName.toLowerCase();
		return name === "input" && elem.type === type;
	};
}

/**
 * Returns a function to use in pseudos for buttons
 * @param {String} type
 */
function createButtonPseudo( type ) {
	return function( elem ) {
		var name = elem.nodeName.toLowerCase();
		return (name === "input" || name === "button") && elem.type === type;
	};
}

/**
 * Returns a function to use in pseudos for positionals
 * @param {Function} fn
 */
function createPositionalPseudo( fn ) {
	return markFunction(function( argument ) {
		argument = +argument;
		return markFunction(function( seed, matches ) {
			var j,
				matchIndexes = fn( [], seed.length, argument ),
				i = matchIndexes.length;

			// Match elements found at the specified indexes
			while ( i-- ) {
				if ( seed[ (j = matchIndexes[i]) ] ) {
					seed[j] = !(matches[j] = seed[j]);
				}
			}
		});
	});
}

/**
 * Detect xml
 * @param {Element|Object} elem An element or a document
 */
isXML = Sizzle.isXML = function( elem ) {
	// documentElement is verified for cases where it doesn't yet exist
	// (such as loading iframes in IE - #4833)
	var documentElement = elem && (elem.ownerDocument || elem).documentElement;
	return documentElement ? documentElement.nodeName !== "HTML" : false;
};

// Expose support vars for convenience
support = Sizzle.support = {};

/**
 * Sets document-related variables once based on the current document
 * @param {Element|Object} [doc] An element or document object to use to set the document
 * @returns {Object} Returns the current document
 */
setDocument = Sizzle.setDocument = function( node ) {
	var doc = node ? node.ownerDocument || node : preferredDoc,
		parent = doc.defaultView;

	// If no document and documentElement is available, return
	if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
		return document;
	}

	// Set our document
	document = doc;
	docElem = doc.documentElement;

	// Support tests
	documentIsHTML = !isXML( doc );

	// Support: IE>8
	// If iframe document is assigned to "document" variable and if iframe has been reloaded,
	// IE will throw "permission denied" error when accessing "document" variable, see jQuery #13936
	// IE6-8 do not support the defaultView property so parent will be undefined
	if ( parent && parent.attachEvent && parent !== parent.top ) {
		parent.attachEvent( "onbeforeunload", function() {
			setDocument();
		});
	}

	/* Attributes
	---------------------------------------------------------------------- */

	// Support: IE<8
	// Verify that getAttribute really returns attributes and not properties (excepting IE8 booleans)
	support.attributes = assert(function( div ) {
		div.className = "i";
		return !div.getAttribute("className");
	});

	/* getElement(s)By*
	---------------------------------------------------------------------- */

	// Check if getElementsByTagName("*") returns only elements
	support.getElementsByTagName = assert(function( div ) {
		div.appendChild( doc.createComment("") );
		return !div.getElementsByTagName("*").length;
	});

	// Check if getElementsByClassName can be trusted
	support.getElementsByClassName = assert(function( div ) {
		div.innerHTML = "<div class='a'></div><div class='a i'></div>";

		// Support: Safari<4
		// Catch class over-caching
		div.firstChild.className = "i";
		// Support: Opera<10
		// Catch gEBCN failure to find non-leading classes
		return div.getElementsByClassName("i").length === 2;
	});

	// Support: IE<10
	// Check if getElementById returns elements by name
	// The broken getElementById methods don't pick up programatically-set names,
	// so use a roundabout getElementsByName test
	support.getById = assert(function( div ) {
		docElem.appendChild( div ).id = expando;
		return !doc.getElementsByName || !doc.getElementsByName( expando ).length;
	});

	// ID find and filter
	if ( support.getById ) {
		Expr.find["ID"] = function( id, context ) {
			if ( typeof context.getElementById !== strundefined && documentIsHTML ) {
				var m = context.getElementById( id );
				// Check parentNode to catch when Blackberry 4.6 returns
				// nodes that are no longer in the document #6963
				return m && m.parentNode ? [m] : [];
			}
		};
		Expr.filter["ID"] = function( id ) {
			var attrId = id.replace( runescape, funescape );
			return function( elem ) {
				return elem.getAttribute("id") === attrId;
			};
		};
	} else {
		// Support: IE6/7
		// getElementById is not reliable as a find shortcut
		delete Expr.find["ID"];

		Expr.filter["ID"] =  function( id ) {
			var attrId = id.replace( runescape, funescape );
			return function( elem ) {
				var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
				return node && node.value === attrId;
			};
		};
	}

	// Tag
	Expr.find["TAG"] = support.getElementsByTagName ?
		function( tag, context ) {
			if ( typeof context.getElementsByTagName !== strundefined ) {
				return context.getElementsByTagName( tag );
			}
		} :
		function( tag, context ) {
			var elem,
				tmp = [],
				i = 0,
				results = context.getElementsByTagName( tag );

			// Filter out possible comments
			if ( tag === "*" ) {
				while ( (elem = results[i++]) ) {
					if ( elem.nodeType === 1 ) {
						tmp.push( elem );
					}
				}

				return tmp;
			}
			return results;
		};

	// Class
	Expr.find["CLASS"] = support.getElementsByClassName && function( className, context ) {
		if ( typeof context.getElementsByClassName !== strundefined && documentIsHTML ) {
			return context.getElementsByClassName( className );
		}
	};

	/* QSA/matchesSelector
	---------------------------------------------------------------------- */

	// QSA and matchesSelector support

	// matchesSelector(:active) reports false when true (IE9/Opera 11.5)
	rbuggyMatches = [];

	// qSa(:focus) reports false when true (Chrome 21)
	// We allow this because of a bug in IE8/9 that throws an error
	// whenever `document.activeElement` is accessed on an iframe
	// So, we allow :focus to pass through QSA all the time to avoid the IE error
	// See http://bugs.jquery.com/ticket/13378
	rbuggyQSA = [];

	if ( (support.qsa = rnative.test( doc.querySelectorAll )) ) {
		// Build QSA regex
		// Regex strategy adopted from Diego Perini
		assert(function( div ) {
			// Select is set to empty string on purpose
			// This is to test IE's treatment of not explicitly
			// setting a boolean content attribute,
			// since its presence should be enough
			// http://bugs.jquery.com/ticket/12359
			div.innerHTML = "<select><option selected=''></option></select>";

			// Support: IE8
			// Boolean attributes and "value" are not treated correctly
			if ( !div.querySelectorAll("[selected]").length ) {
				rbuggyQSA.push( "\\[" + whitespace + "*(?:value|" + booleans + ")" );
			}

			// Webkit/Opera - :checked should return selected option elements
			// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
			// IE8 throws error here and will not see later tests
			if ( !div.querySelectorAll(":checked").length ) {
				rbuggyQSA.push(":checked");
			}
		});

		assert(function( div ) {

			// Support: Opera 10-12/IE8
			// ^= $= *= and empty values
			// Should not select anything
			// Support: Windows 8 Native Apps
			// The type attribute is restricted during .innerHTML assignment
			var input = doc.createElement("input");
			input.setAttribute( "type", "hidden" );
			div.appendChild( input ).setAttribute( "t", "" );

			if ( div.querySelectorAll("[t^='']").length ) {
				rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:''|\"\")" );
			}

			// FF 3.5 - :enabled/:disabled and hidden elements (hidden elements are still enabled)
			// IE8 throws error here and will not see later tests
			if ( !div.querySelectorAll(":enabled").length ) {
				rbuggyQSA.push( ":enabled", ":disabled" );
			}

			// Opera 10-11 does not throw on post-comma invalid pseudos
			div.querySelectorAll("*,:x");
			rbuggyQSA.push(",.*:");
		});
	}

	if ( (support.matchesSelector = rnative.test( (matches = docElem.webkitMatchesSelector ||
		docElem.mozMatchesSelector ||
		docElem.oMatchesSelector ||
		docElem.msMatchesSelector) )) ) {

		assert(function( div ) {
			// Check to see if it's possible to do matchesSelector
			// on a disconnected node (IE 9)
			support.disconnectedMatch = matches.call( div, "div" );

			// This should fail with an exception
			// Gecko does not error, returns false instead
			matches.call( div, "[s!='']:x" );
			rbuggyMatches.push( "!=", pseudos );
		});
	}

	rbuggyQSA = rbuggyQSA.length && new RegExp( rbuggyQSA.join("|") );
	rbuggyMatches = rbuggyMatches.length && new RegExp( rbuggyMatches.join("|") );

	/* Contains
	---------------------------------------------------------------------- */

	// Element contains another
	// Purposefully does not implement inclusive descendent
	// As in, an element does not contain itself
	contains = rnative.test( docElem.contains ) || docElem.compareDocumentPosition ?
		function( a, b ) {
			var adown = a.nodeType === 9 ? a.documentElement : a,
				bup = b && b.parentNode;
			return a === bup || !!( bup && bup.nodeType === 1 && (
				adown.contains ?
					adown.contains( bup ) :
					a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
			));
		} :
		function( a, b ) {
			if ( b ) {
				while ( (b = b.parentNode) ) {
					if ( b === a ) {
						return true;
					}
				}
			}
			return false;
		};

	/* Sorting
	---------------------------------------------------------------------- */

	// Document order sorting
	sortOrder = docElem.compareDocumentPosition ?
	function( a, b ) {

		// Flag for duplicate removal
		if ( a === b ) {
			hasDuplicate = true;
			return 0;
		}

		var compare = b.compareDocumentPosition && a.compareDocumentPosition && a.compareDocumentPosition( b );

		if ( compare ) {
			// Disconnected nodes
			if ( compare & 1 ||
				(!support.sortDetached && b.compareDocumentPosition( a ) === compare) ) {

				// Choose the first element that is related to our preferred document
				if ( a === doc || contains(preferredDoc, a) ) {
					return -1;
				}
				if ( b === doc || contains(preferredDoc, b) ) {
					return 1;
				}

				// Maintain original order
				return sortInput ?
					( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
					0;
			}

			return compare & 4 ? -1 : 1;
		}

		// Not directly comparable, sort on existence of method
		return a.compareDocumentPosition ? -1 : 1;
	} :
	function( a, b ) {
		var cur,
			i = 0,
			aup = a.parentNode,
			bup = b.parentNode,
			ap = [ a ],
			bp = [ b ];

		// Exit early if the nodes are identical
		if ( a === b ) {
			hasDuplicate = true;
			return 0;

		// Parentless nodes are either documents or disconnected
		} else if ( !aup || !bup ) {
			return a === doc ? -1 :
				b === doc ? 1 :
				aup ? -1 :
				bup ? 1 :
				sortInput ?
				( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
				0;

		// If the nodes are siblings, we can do a quick check
		} else if ( aup === bup ) {
			return siblingCheck( a, b );
		}

		// Otherwise we need full lists of their ancestors for comparison
		cur = a;
		while ( (cur = cur.parentNode) ) {
			ap.unshift( cur );
		}
		cur = b;
		while ( (cur = cur.parentNode) ) {
			bp.unshift( cur );
		}

		// Walk down the tree looking for a discrepancy
		while ( ap[i] === bp[i] ) {
			i++;
		}

		return i ?
			// Do a sibling check if the nodes have a common ancestor
			siblingCheck( ap[i], bp[i] ) :

			// Otherwise nodes in our document sort first
			ap[i] === preferredDoc ? -1 :
			bp[i] === preferredDoc ? 1 :
			0;
	};

	return doc;
};

Sizzle.matches = function( expr, elements ) {
	return Sizzle( expr, null, null, elements );
};

Sizzle.matchesSelector = function( elem, expr ) {
	// Set document vars if needed
	if ( ( elem.ownerDocument || elem ) !== document ) {
		setDocument( elem );
	}

	// Make sure that attribute selectors are quoted
	expr = expr.replace( rattributeQuotes, "='$1']" );

	if ( support.matchesSelector && documentIsHTML &&
		( !rbuggyMatches || !rbuggyMatches.test( expr ) ) &&
		( !rbuggyQSA     || !rbuggyQSA.test( expr ) ) ) {

		try {
			var ret = matches.call( elem, expr );

			// IE 9's matchesSelector returns false on disconnected nodes
			if ( ret || support.disconnectedMatch ||
					// As well, disconnected nodes are said to be in a document
					// fragment in IE 9
					elem.document && elem.document.nodeType !== 11 ) {
				return ret;
			}
		} catch(e) {}
	}

	return Sizzle( expr, document, null, [elem] ).length > 0;
};

Sizzle.contains = function( context, elem ) {
	// Set document vars if needed
	if ( ( context.ownerDocument || context ) !== document ) {
		setDocument( context );
	}
	return contains( context, elem );
};

Sizzle.attr = function( elem, name ) {
	// Set document vars if needed
	if ( ( elem.ownerDocument || elem ) !== document ) {
		setDocument( elem );
	}

	var fn = Expr.attrHandle[ name.toLowerCase() ],
		// Don't get fooled by Object.prototype properties (jQuery #13807)
		val = fn && hasOwn.call( Expr.attrHandle, name.toLowerCase() ) ?
			fn( elem, name, !documentIsHTML ) :
			undefined;

	return val === undefined ?
		support.attributes || !documentIsHTML ?
			elem.getAttribute( name ) :
			(val = elem.getAttributeNode(name)) && val.specified ?
				val.value :
				null :
		val;
};

Sizzle.error = function( msg ) {
	throw new Error( "Syntax error, unrecognized expression: " + msg );
};

/**
 * Document sorting and removing duplicates
 * @param {ArrayLike} results
 */
Sizzle.uniqueSort = function( results ) {
	var elem,
		duplicates = [],
		j = 0,
		i = 0;

	// Unless we *know* we can detect duplicates, assume their presence
	hasDuplicate = !support.detectDuplicates;
	sortInput = !support.sortStable && results.slice( 0 );
	results.sort( sortOrder );

	if ( hasDuplicate ) {
		while ( (elem = results[i++]) ) {
			if ( elem === results[ i ] ) {
				j = duplicates.push( i );
			}
		}
		while ( j-- ) {
			results.splice( duplicates[ j ], 1 );
		}
	}

	return results;
};

/**
 * Utility function for retrieving the text value of an array of DOM nodes
 * @param {Array|Element} elem
 */
getText = Sizzle.getText = function( elem ) {
	var node,
		ret = "",
		i = 0,
		nodeType = elem.nodeType;

	if ( !nodeType ) {
		// If no nodeType, this is expected to be an array
		for ( ; (node = elem[i]); i++ ) {
			// Do not traverse comment nodes
			ret += getText( node );
		}
	} else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
		// Use textContent for elements
		// innerText usage removed for consistency of new lines (see #11153)
		if ( typeof elem.textContent === "string" ) {
			return elem.textContent;
		} else {
			// Traverse its children
			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
				ret += getText( elem );
			}
		}
	} else if ( nodeType === 3 || nodeType === 4 ) {
		return elem.nodeValue;
	}
	// Do not include comment or processing instruction nodes

	return ret;
};

Expr = Sizzle.selectors = {

	// Can be adjusted by the user
	cacheLength: 50,

	createPseudo: markFunction,

	match: matchExpr,

	attrHandle: {},

	find: {},

	relative: {
		">": { dir: "parentNode", first: true },
		" ": { dir: "parentNode" },
		"+": { dir: "previousSibling", first: true },
		"~": { dir: "previousSibling" }
	},

	preFilter: {
		"ATTR": function( match ) {
			match[1] = match[1].replace( runescape, funescape );

			// Move the given value to match[3] whether quoted or unquoted
			match[3] = ( match[4] || match[5] || "" ).replace( runescape, funescape );

			if ( match[2] === "~=" ) {
				match[3] = " " + match[3] + " ";
			}

			return match.slice( 0, 4 );
		},

		"CHILD": function( match ) {
			/* matches from matchExpr["CHILD"]
				1 type (only|nth|...)
				2 what (child|of-type)
				3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
				4 xn-component of xn+y argument ([+-]?\d*n|)
				5 sign of xn-component
				6 x of xn-component
				7 sign of y-component
				8 y of y-component
			*/
			match[1] = match[1].toLowerCase();

			if ( match[1].slice( 0, 3 ) === "nth" ) {
				// nth-* requires argument
				if ( !match[3] ) {
					Sizzle.error( match[0] );
				}

				// numeric x and y parameters for Expr.filter.CHILD
				// remember that false/true cast respectively to 0/1
				match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
				match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );

			// other types prohibit arguments
			} else if ( match[3] ) {
				Sizzle.error( match[0] );
			}

			return match;
		},

		"PSEUDO": function( match ) {
			var excess,
				unquoted = !match[5] && match[2];

			if ( matchExpr["CHILD"].test( match[0] ) ) {
				return null;
			}

			// Accept quoted arguments as-is
			if ( match[3] && match[4] !== undefined ) {
				match[2] = match[4];

			// Strip excess characters from unquoted arguments
			} else if ( unquoted && rpseudo.test( unquoted ) &&
				// Get excess from tokenize (recursively)
				(excess = tokenize( unquoted, true )) &&
				// advance to the next closing parenthesis
				(excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length) ) {

				// excess is a negative index
				match[0] = match[0].slice( 0, excess );
				match[2] = unquoted.slice( 0, excess );
			}

			// Return only captures needed by the pseudo filter method (type and argument)
			return match.slice( 0, 3 );
		}
	},

	filter: {

		"TAG": function( nodeNameSelector ) {
			var nodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
			return nodeNameSelector === "*" ?
				function() { return true; } :
				function( elem ) {
					return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
				};
		},

		"CLASS": function( className ) {
			var pattern = classCache[ className + " " ];

			return pattern ||
				(pattern = new RegExp( "(^|" + whitespace + ")" + className + "(" + whitespace + "|$)" )) &&
				classCache( className, function( elem ) {
					return pattern.test( typeof elem.className === "string" && elem.className || typeof elem.getAttribute !== strundefined && elem.getAttribute("class") || "" );
				});
		},

		"ATTR": function( name, operator, check ) {
			return function( elem ) {
				var result = Sizzle.attr( elem, name );

				if ( result == null ) {
					return operator === "!=";
				}
				if ( !operator ) {
					return true;
				}

				result += "";

				return operator === "=" ? result === check :
					operator === "!=" ? result !== check :
					operator === "^=" ? check && result.indexOf( check ) === 0 :
					operator === "*=" ? check && result.indexOf( check ) > -1 :
					operator === "$=" ? check && result.slice( -check.length ) === check :
					operator === "~=" ? ( " " + result + " " ).indexOf( check ) > -1 :
					operator === "|=" ? result === check || result.slice( 0, check.length + 1 ) === check + "-" :
					false;
			};
		},

		"CHILD": function( type, what, argument, first, last ) {
			var simple = type.slice( 0, 3 ) !== "nth",
				forward = type.slice( -4 ) !== "last",
				ofType = what === "of-type";

			return first === 1 && last === 0 ?

				// Shortcut for :nth-*(n)
				function( elem ) {
					return !!elem.parentNode;
				} :

				function( elem, context, xml ) {
					var cache, outerCache, node, diff, nodeIndex, start,
						dir = simple !== forward ? "nextSibling" : "previousSibling",
						parent = elem.parentNode,
						name = ofType && elem.nodeName.toLowerCase(),
						useCache = !xml && !ofType;

					if ( parent ) {

						// :(first|last|only)-(child|of-type)
						if ( simple ) {
							while ( dir ) {
								node = elem;
								while ( (node = node[ dir ]) ) {
									if ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) {
										return false;
									}
								}
								// Reverse direction for :only-* (if we haven't yet done so)
								start = dir = type === "only" && !start && "nextSibling";
							}
							return true;
						}

						start = [ forward ? parent.firstChild : parent.lastChild ];

						// non-xml :nth-child(...) stores cache data on `parent`
						if ( forward && useCache ) {
							// Seek `elem` from a previously-cached index
							outerCache = parent[ expando ] || (parent[ expando ] = {});
							cache = outerCache[ type ] || [];
							nodeIndex = cache[0] === dirruns && cache[1];
							diff = cache[0] === dirruns && cache[2];
							node = nodeIndex && parent.childNodes[ nodeIndex ];

							while ( (node = ++nodeIndex && node && node[ dir ] ||

								// Fallback to seeking `elem` from the start
								(diff = nodeIndex = 0) || start.pop()) ) {

								// When found, cache indexes on `parent` and break
								if ( node.nodeType === 1 && ++diff && node === elem ) {
									outerCache[ type ] = [ dirruns, nodeIndex, diff ];
									break;
								}
							}

						// Use previously-cached element index if available
						} else if ( useCache && (cache = (elem[ expando ] || (elem[ expando ] = {}))[ type ]) && cache[0] === dirruns ) {
							diff = cache[1];

						// xml :nth-child(...) or :nth-last-child(...) or :nth(-last)?-of-type(...)
						} else {
							// Use the same loop as above to seek `elem` from the start
							while ( (node = ++nodeIndex && node && node[ dir ] ||
								(diff = nodeIndex = 0) || start.pop()) ) {

								if ( ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) && ++diff ) {
									// Cache the index of each encountered element
									if ( useCache ) {
										(node[ expando ] || (node[ expando ] = {}))[ type ] = [ dirruns, diff ];
									}

									if ( node === elem ) {
										break;
									}
								}
							}
						}

						// Incorporate the offset, then check against cycle size
						diff -= last;
						return diff === first || ( diff % first === 0 && diff / first >= 0 );
					}
				};
		},

		"PSEUDO": function( pseudo, argument ) {
			// pseudo-class names are case-insensitive
			// http://www.w3.org/TR/selectors/#pseudo-classes
			// Prioritize by case sensitivity in case custom pseudos are added with uppercase letters
			// Remember that setFilters inherits from pseudos
			var args,
				fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
					Sizzle.error( "unsupported pseudo: " + pseudo );

			// The user may use createPseudo to indicate that
			// arguments are needed to create the filter function
			// just as Sizzle does
			if ( fn[ expando ] ) {
				return fn( argument );
			}

			// But maintain support for old signatures
			if ( fn.length > 1 ) {
				args = [ pseudo, pseudo, "", argument ];
				return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
					markFunction(function( seed, matches ) {
						var idx,
							matched = fn( seed, argument ),
							i = matched.length;
						while ( i-- ) {
							idx = indexOf.call( seed, matched[i] );
							seed[ idx ] = !( matches[ idx ] = matched[i] );
						}
					}) :
					function( elem ) {
						return fn( elem, 0, args );
					};
			}

			return fn;
		}
	},

	pseudos: {
		// Potentially complex pseudos
		"not": markFunction(function( selector ) {
			// Trim the selector passed to compile
			// to avoid treating leading and trailing
			// spaces as combinators
			var input = [],
				results = [],
				matcher = compile( selector.replace( rtrim, "$1" ) );

			return matcher[ expando ] ?
				markFunction(function( seed, matches, context, xml ) {
					var elem,
						unmatched = matcher( seed, null, xml, [] ),
						i = seed.length;

					// Match elements unmatched by `matcher`
					while ( i-- ) {
						if ( (elem = unmatched[i]) ) {
							seed[i] = !(matches[i] = elem);
						}
					}
				}) :
				function( elem, context, xml ) {
					input[0] = elem;
					matcher( input, null, xml, results );
					return !results.pop();
				};
		}),

		"has": markFunction(function( selector ) {
			return function( elem ) {
				return Sizzle( selector, elem ).length > 0;
			};
		}),

		"contains": markFunction(function( text ) {
			return function( elem ) {
				return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1;
			};
		}),

		// "Whether an element is represented by a :lang() selector
		// is based solely on the element's language value
		// being equal to the identifier C,
		// or beginning with the identifier C immediately followed by "-".
		// The matching of C against the element's language value is performed case-insensitively.
		// The identifier C does not have to be a valid language name."
		// http://www.w3.org/TR/selectors/#lang-pseudo
		"lang": markFunction( function( lang ) {
			// lang value must be a valid identifier
			if ( !ridentifier.test(lang || "") ) {
				Sizzle.error( "unsupported lang: " + lang );
			}
			lang = lang.replace( runescape, funescape ).toLowerCase();
			return function( elem ) {
				var elemLang;
				do {
					if ( (elemLang = documentIsHTML ?
						elem.lang :
						elem.getAttribute("xml:lang") || elem.getAttribute("lang")) ) {

						elemLang = elemLang.toLowerCase();
						return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
					}
				} while ( (elem = elem.parentNode) && elem.nodeType === 1 );
				return false;
			};
		}),

		// Miscellaneous
		"target": function( elem ) {
			var hash = window.location && window.location.hash;
			return hash && hash.slice( 1 ) === elem.id;
		},

		"root": function( elem ) {
			return elem === docElem;
		},

		"focus": function( elem ) {
			return elem === document.activeElement && (!document.hasFocus || document.hasFocus()) && !!(elem.type || elem.href || ~elem.tabIndex);
		},

		// Boolean properties
		"enabled": function( elem ) {
			return elem.disabled === false;
		},

		"disabled": function( elem ) {
			return elem.disabled === true;
		},

		"checked": function( elem ) {
			// In CSS3, :checked should return both checked and selected elements
			// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
			var nodeName = elem.nodeName.toLowerCase();
			return (nodeName === "input" && !!elem.checked) || (nodeName === "option" && !!elem.selected);
		},

		"selected": function( elem ) {
			// Accessing this property makes selected-by-default
			// options in Safari work properly
			if ( elem.parentNode ) {
				elem.parentNode.selectedIndex;
			}

			return elem.selected === true;
		},

		// Contents
		"empty": function( elem ) {
			// http://www.w3.org/TR/selectors/#empty-pseudo
			// :empty is only affected by element nodes and content nodes(including text(3), cdata(4)),
			//   not comment, processing instructions, or others
			// Thanks to Diego Perini for the nodeName shortcut
			//   Greater than "@" means alpha characters (specifically not starting with "#" or "?")
			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
				if ( elem.nodeName > "@" || elem.nodeType === 3 || elem.nodeType === 4 ) {
					return false;
				}
			}
			return true;
		},

		"parent": function( elem ) {
			return !Expr.pseudos["empty"]( elem );
		},

		// Element/input types
		"header": function( elem ) {
			return rheader.test( elem.nodeName );
		},

		"input": function( elem ) {
			return rinputs.test( elem.nodeName );
		},

		"button": function( elem ) {
			var name = elem.nodeName.toLowerCase();
			return name === "input" && elem.type === "button" || name === "button";
		},

		"text": function( elem ) {
			var attr;
			// IE6 and 7 will map elem.type to 'text' for new HTML5 types (search, etc)
			// use getAttribute instead to test this case
			return elem.nodeName.toLowerCase() === "input" &&
				elem.type === "text" &&
				( (attr = elem.getAttribute("type")) == null || attr.toLowerCase() === elem.type );
		},

		// Position-in-collection
		"first": createPositionalPseudo(function() {
			return [ 0 ];
		}),

		"last": createPositionalPseudo(function( matchIndexes, length ) {
			return [ length - 1 ];
		}),

		"eq": createPositionalPseudo(function( matchIndexes, length, argument ) {
			return [ argument < 0 ? argument + length : argument ];
		}),

		"even": createPositionalPseudo(function( matchIndexes, length ) {
			var i = 0;
			for ( ; i < length; i += 2 ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		}),

		"odd": createPositionalPseudo(function( matchIndexes, length ) {
			var i = 1;
			for ( ; i < length; i += 2 ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		}),

		"lt": createPositionalPseudo(function( matchIndexes, length, argument ) {
			var i = argument < 0 ? argument + length : argument;
			for ( ; --i >= 0; ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		}),

		"gt": createPositionalPseudo(function( matchIndexes, length, argument ) {
			var i = argument < 0 ? argument + length : argument;
			for ( ; ++i < length; ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		})
	}
};

Expr.pseudos["nth"] = Expr.pseudos["eq"];

// Add button/input type pseudos
for ( i in { radio: true, checkbox: true, file: true, password: true, image: true } ) {
	Expr.pseudos[ i ] = createInputPseudo( i );
}
for ( i in { submit: true, reset: true } ) {
	Expr.pseudos[ i ] = createButtonPseudo( i );
}

// Easy API for creating new setFilters
 function setFilters() {}
setFilters.prototype = Expr.filters = Expr.pseudos;
Expr.setFilters = new setFilters();

function tokenize( selector, parseOnly ) {
	var matched, match, tokens, type,
		soFar, groups, preFilters,
		cached = tokenCache[ selector + " " ];

	if ( cached ) {
		return parseOnly ? 0 : cached.slice( 0 );
	}

	soFar = selector;
	groups = [];
	preFilters = Expr.preFilter;

	while ( soFar ) {

		// Comma and first run
		if ( !matched || (match = rcomma.exec( soFar )) ) {
			if ( match ) {
				// Don't consume trailing commas as valid
				soFar = soFar.slice( match[0].length ) || soFar;
			}
			groups.push( tokens = [] );
		}

		matched = false;

		// Combinators
		if ( (match = rcombinators.exec( soFar )) ) {
			matched = match.shift();
			tokens.push({
				value: matched,
				// Cast descendant combinators to space
				type: match[0].replace( rtrim, " " )
			});
			soFar = soFar.slice( matched.length );
		}

		// Filters
		for ( type in Expr.filter ) {
			if ( (match = matchExpr[ type ].exec( soFar )) && (!preFilters[ type ] ||
				(match = preFilters[ type ]( match ))) ) {
				matched = match.shift();
				tokens.push({
					value: matched,
					type: type,
					matches: match
				});
				soFar = soFar.slice( matched.length );
			}
		}

		if ( !matched ) {
			break;
		}
	}

	// Return the length of the invalid excess
	// if we're just parsing
	// Otherwise, throw an error or return tokens
	return parseOnly ?
		soFar.length :
		soFar ?
			Sizzle.error( selector ) :
			// Cache the tokens
			tokenCache( selector, groups ).slice( 0 );
}

function toSelector( tokens ) {
	var i = 0,
		len = tokens.length,
		selector = "";
	for ( ; i < len; i++ ) {
		selector += tokens[i].value;
	}
	return selector;
}

function addCombinator( matcher, combinator, base ) {
	var dir = combinator.dir,
		checkNonElements = base && dir === "parentNode",
		doneName = done++;

	return combinator.first ?
		// Check against closest ancestor/preceding element
		function( elem, context, xml ) {
			while ( (elem = elem[ dir ]) ) {
				if ( elem.nodeType === 1 || checkNonElements ) {
					return matcher( elem, context, xml );
				}
			}
		} :

		// Check against all ancestor/preceding elements
		function( elem, context, xml ) {
			var data, cache, outerCache,
				dirkey = dirruns + " " + doneName;

			// We can't set arbitrary data on XML nodes, so they don't benefit from dir caching
			if ( xml ) {
				while ( (elem = elem[ dir ]) ) {
					if ( elem.nodeType === 1 || checkNonElements ) {
						if ( matcher( elem, context, xml ) ) {
							return true;
						}
					}
				}
			} else {
				while ( (elem = elem[ dir ]) ) {
					if ( elem.nodeType === 1 || checkNonElements ) {
						outerCache = elem[ expando ] || (elem[ expando ] = {});
						if ( (cache = outerCache[ dir ]) && cache[0] === dirkey ) {
							if ( (data = cache[1]) === true || data === cachedruns ) {
								return data === true;
							}
						} else {
							cache = outerCache[ dir ] = [ dirkey ];
							cache[1] = matcher( elem, context, xml ) || cachedruns;
							if ( cache[1] === true ) {
								return true;
							}
						}
					}
				}
			}
		};
}

function elementMatcher( matchers ) {
	return matchers.length > 1 ?
		function( elem, context, xml ) {
			var i = matchers.length;
			while ( i-- ) {
				if ( !matchers[i]( elem, context, xml ) ) {
					return false;
				}
			}
			return true;
		} :
		matchers[0];
}

function condense( unmatched, map, filter, context, xml ) {
	var elem,
		newUnmatched = [],
		i = 0,
		len = unmatched.length,
		mapped = map != null;

	for ( ; i < len; i++ ) {
		if ( (elem = unmatched[i]) ) {
			if ( !filter || filter( elem, context, xml ) ) {
				newUnmatched.push( elem );
				if ( mapped ) {
					map.push( i );
				}
			}
		}
	}

	return newUnmatched;
}

function setMatcher( preFilter, selector, matcher, postFilter, postFinder, postSelector ) {
	if ( postFilter && !postFilter[ expando ] ) {
		postFilter = setMatcher( postFilter );
	}
	if ( postFinder && !postFinder[ expando ] ) {
		postFinder = setMatcher( postFinder, postSelector );
	}
	return markFunction(function( seed, results, context, xml ) {
		var temp, i, elem,
			preMap = [],
			postMap = [],
			preexisting = results.length,

			// Get initial elements from seed or context
			elems = seed || multipleContexts( selector || "*", context.nodeType ? [ context ] : context, [] ),

			// Prefilter to get matcher input, preserving a map for seed-results synchronization
			matcherIn = preFilter && ( seed || !selector ) ?
				condense( elems, preMap, preFilter, context, xml ) :
				elems,

			matcherOut = matcher ?
				// If we have a postFinder, or filtered seed, or non-seed postFilter or preexisting results,
				postFinder || ( seed ? preFilter : preexisting || postFilter ) ?

					// ...intermediate processing is necessary
					[] :

					// ...otherwise use results directly
					results :
				matcherIn;

		// Find primary matches
		if ( matcher ) {
			matcher( matcherIn, matcherOut, context, xml );
		}

		// Apply postFilter
		if ( postFilter ) {
			temp = condense( matcherOut, postMap );
			postFilter( temp, [], context, xml );

			// Un-match failing elements by moving them back to matcherIn
			i = temp.length;
			while ( i-- ) {
				if ( (elem = temp[i]) ) {
					matcherOut[ postMap[i] ] = !(matcherIn[ postMap[i] ] = elem);
				}
			}
		}

		if ( seed ) {
			if ( postFinder || preFilter ) {
				if ( postFinder ) {
					// Get the final matcherOut by condensing this intermediate into postFinder contexts
					temp = [];
					i = matcherOut.length;
					while ( i-- ) {
						if ( (elem = matcherOut[i]) ) {
							// Restore matcherIn since elem is not yet a final match
							temp.push( (matcherIn[i] = elem) );
						}
					}
					postFinder( null, (matcherOut = []), temp, xml );
				}

				// Move matched elements from seed to results to keep them synchronized
				i = matcherOut.length;
				while ( i-- ) {
					if ( (elem = matcherOut[i]) &&
						(temp = postFinder ? indexOf.call( seed, elem ) : preMap[i]) > -1 ) {

						seed[temp] = !(results[temp] = elem);
					}
				}
			}

		// Add elements to results, through postFinder if defined
		} else {
			matcherOut = condense(
				matcherOut === results ?
					matcherOut.splice( preexisting, matcherOut.length ) :
					matcherOut
			);
			if ( postFinder ) {
				postFinder( null, results, matcherOut, xml );
			} else {
				push.apply( results, matcherOut );
			}
		}
	});
}

function matcherFromTokens( tokens ) {
	var checkContext, matcher, j,
		len = tokens.length,
		leadingRelative = Expr.relative[ tokens[0].type ],
		implicitRelative = leadingRelative || Expr.relative[" "],
		i = leadingRelative ? 1 : 0,

		// The foundational matcher ensures that elements are reachable from top-level context(s)
		matchContext = addCombinator( function( elem ) {
			return elem === checkContext;
		}, implicitRelative, true ),
		matchAnyContext = addCombinator( function( elem ) {
			return indexOf.call( checkContext, elem ) > -1;
		}, implicitRelative, true ),
		matchers = [ function( elem, context, xml ) {
			return ( !leadingRelative && ( xml || context !== outermostContext ) ) || (
				(checkContext = context).nodeType ?
					matchContext( elem, context, xml ) :
					matchAnyContext( elem, context, xml ) );
		} ];

	for ( ; i < len; i++ ) {
		if ( (matcher = Expr.relative[ tokens[i].type ]) ) {
			matchers = [ addCombinator(elementMatcher( matchers ), matcher) ];
		} else {
			matcher = Expr.filter[ tokens[i].type ].apply( null, tokens[i].matches );

			// Return special upon seeing a positional matcher
			if ( matcher[ expando ] ) {
				// Find the next relative operator (if any) for proper handling
				j = ++i;
				for ( ; j < len; j++ ) {
					if ( Expr.relative[ tokens[j].type ] ) {
						break;
					}
				}
				return setMatcher(
					i > 1 && elementMatcher( matchers ),
					i > 1 && toSelector(
						// If the preceding token was a descendant combinator, insert an implicit any-element `*`
						tokens.slice( 0, i - 1 ).concat({ value: tokens[ i - 2 ].type === " " ? "*" : "" })
					).replace( rtrim, "$1" ),
					matcher,
					i < j && matcherFromTokens( tokens.slice( i, j ) ),
					j < len && matcherFromTokens( (tokens = tokens.slice( j )) ),
					j < len && toSelector( tokens )
				);
			}
			matchers.push( matcher );
		}
	}

	return elementMatcher( matchers );
}

function matcherFromGroupMatchers( elementMatchers, setMatchers ) {
	// A counter to specify which element is currently being matched
	var matcherCachedRuns = 0,
		bySet = setMatchers.length > 0,
		byElement = elementMatchers.length > 0,
		superMatcher = function( seed, context, xml, results, expandContext ) {
			var elem, j, matcher,
				setMatched = [],
				matchedCount = 0,
				i = "0",
				unmatched = seed && [],
				outermost = expandContext != null,
				contextBackup = outermostContext,
				// We must always have either seed elements or context
				elems = seed || byElement && Expr.find["TAG"]( "*", expandContext && context.parentNode || context ),
				// Use integer dirruns iff this is the outermost matcher
				dirrunsUnique = (dirruns += contextBackup == null ? 1 : Math.random() || 0.1);

			if ( outermost ) {
				outermostContext = context !== document && context;
				cachedruns = matcherCachedRuns;
			}

			// Add elements passing elementMatchers directly to results
			// Keep `i` a string if there are no elements so `matchedCount` will be "00" below
			for ( ; (elem = elems[i]) != null; i++ ) {
				if ( byElement && elem ) {
					j = 0;
					while ( (matcher = elementMatchers[j++]) ) {
						if ( matcher( elem, context, xml ) ) {
							results.push( elem );
							break;
						}
					}
					if ( outermost ) {
						dirruns = dirrunsUnique;
						cachedruns = ++matcherCachedRuns;
					}
				}

				// Track unmatched elements for set filters
				if ( bySet ) {
					// They will have gone through all possible matchers
					if ( (elem = !matcher && elem) ) {
						matchedCount--;
					}

					// Lengthen the array for every element, matched or not
					if ( seed ) {
						unmatched.push( elem );
					}
				}
			}

			// Apply set filters to unmatched elements
			matchedCount += i;
			if ( bySet && i !== matchedCount ) {
				j = 0;
				while ( (matcher = setMatchers[j++]) ) {
					matcher( unmatched, setMatched, context, xml );
				}

				if ( seed ) {
					// Reintegrate element matches to eliminate the need for sorting
					if ( matchedCount > 0 ) {
						while ( i-- ) {
							if ( !(unmatched[i] || setMatched[i]) ) {
								setMatched[i] = pop.call( results );
							}
						}
					}

					// Discard index placeholder values to get only actual matches
					setMatched = condense( setMatched );
				}

				// Add matches to results
				push.apply( results, setMatched );

				// Seedless set matches succeeding multiple successful matchers stipulate sorting
				if ( outermost && !seed && setMatched.length > 0 &&
					( matchedCount + setMatchers.length ) > 1 ) {

					Sizzle.uniqueSort( results );
				}
			}

			// Override manipulation of globals by nested matchers
			if ( outermost ) {
				dirruns = dirrunsUnique;
				outermostContext = contextBackup;
			}

			return unmatched;
		};

	return bySet ?
		markFunction( superMatcher ) :
		superMatcher;
}

compile = Sizzle.compile = function( selector, group /* Internal Use Only */ ) {
	var i,
		setMatchers = [],
		elementMatchers = [],
		cached = compilerCache[ selector + " " ];

	if ( !cached ) {
		// Generate a function of recursive functions that can be used to check each element
		if ( !group ) {
			group = tokenize( selector );
		}
		i = group.length;
		while ( i-- ) {
			cached = matcherFromTokens( group[i] );
			if ( cached[ expando ] ) {
				setMatchers.push( cached );
			} else {
				elementMatchers.push( cached );
			}
		}

		// Cache the compiled function
		cached = compilerCache( selector, matcherFromGroupMatchers( elementMatchers, setMatchers ) );
	}
	return cached;
};

function multipleContexts( selector, contexts, results ) {
	var i = 0,
		len = contexts.length;
	for ( ; i < len; i++ ) {
		Sizzle( selector, contexts[i], results );
	}
	return results;
}

function select( selector, context, results, seed ) {
	var i, tokens, token, type, find,
		match = tokenize( selector );

	if ( !seed ) {
		// Try to minimize operations if there is only one group
		if ( match.length === 1 ) {

			// Take a shortcut and set the context if the root selector is an ID
			tokens = match[0] = match[0].slice( 0 );
			if ( tokens.length > 2 && (token = tokens[0]).type === "ID" &&
					support.getById && context.nodeType === 9 && documentIsHTML &&
					Expr.relative[ tokens[1].type ] ) {

				context = ( Expr.find["ID"]( token.matches[0].replace(runescape, funescape), context ) || [] )[0];
				if ( !context ) {
					return results;
				}
				selector = selector.slice( tokens.shift().value.length );
			}

			// Fetch a seed set for right-to-left matching
			i = matchExpr["needsContext"].test( selector ) ? 0 : tokens.length;
			while ( i-- ) {
				token = tokens[i];

				// Abort if we hit a combinator
				if ( Expr.relative[ (type = token.type) ] ) {
					break;
				}
				if ( (find = Expr.find[ type ]) ) {
					// Search, expanding context for leading sibling combinators
					if ( (seed = find(
						token.matches[0].replace( runescape, funescape ),
						rsibling.test( tokens[0].type ) && context.parentNode || context
					)) ) {

						// If seed is empty or no tokens remain, we can return early
						tokens.splice( i, 1 );
						selector = seed.length && toSelector( tokens );
						if ( !selector ) {
							push.apply( results, seed );
							return results;
						}

						break;
					}
				}
			}
		}
	}

	// Compile and execute a filtering function
	// Provide `match` to avoid retokenization if we modified the selector above
	compile( selector, match )(
		seed,
		context,
		!documentIsHTML,
		results,
		rsibling.test( selector )
	);
	return results;
}

// One-time assignments

// Sort stability
support.sortStable = expando.split("").sort( sortOrder ).join("") === expando;

// Support: Chrome<14
// Always assume duplicates if they aren't passed to the comparison function
support.detectDuplicates = hasDuplicate;

// Initialize against the default document
setDocument();

// Support: Webkit<537.32 - Safari 6.0.3/Chrome 25 (fixed in Chrome 27)
// Detached nodes confoundingly follow *each other*
support.sortDetached = assert(function( div1 ) {
	// Should return 1, but returns 4 (following)
	return div1.compareDocumentPosition( document.createElement("div") ) & 1;
});

// Support: IE<8
// Prevent attribute/property "interpolation"
// http://msdn.microsoft.com/en-us/library/ms536429%28VS.85%29.aspx
if ( !assert(function( div ) {
	div.innerHTML = "<a href='#'></a>";
	return div.firstChild.getAttribute("href") === "#" ;
}) ) {
	addHandle( "type|href|height|width", function( elem, name, isXML ) {
		if ( !isXML ) {
			return elem.getAttribute( name, name.toLowerCase() === "type" ? 1 : 2 );
		}
	});
}

// Support: IE<9
// Use defaultValue in place of getAttribute("value")
if ( !support.attributes || !assert(function( div ) {
	div.innerHTML = "<input/>";
	div.firstChild.setAttribute( "value", "" );
	return div.firstChild.getAttribute( "value" ) === "";
}) ) {
	addHandle( "value", function( elem, name, isXML ) {
		if ( !isXML && elem.nodeName.toLowerCase() === "input" ) {
			return elem.defaultValue;
		}
	});
}

// Support: IE<9
// Use getAttributeNode to fetch booleans when getAttribute lies
if ( !assert(function( div ) {
	return div.getAttribute("disabled") == null;
}) ) {
	addHandle( booleans, function( elem, name, isXML ) {
		var val;
		if ( !isXML ) {
			return (val = elem.getAttributeNode( name )) && val.specified ?
				val.value :
				elem[ name ] === true ? name.toLowerCase() : null;
		}
	});
}

jQuery.find = Sizzle;
jQuery.expr = Sizzle.selectors;
jQuery.expr[":"] = jQuery.expr.pseudos;
jQuery.unique = Sizzle.uniqueSort;
jQuery.text = Sizzle.getText;
jQuery.isXMLDoc = Sizzle.isXML;
jQuery.contains = Sizzle.contains;

})( window );
}
///////////////////////////////////Sizzle END////////////////////////
///////////////////////////////////Callbacks BEGIN////////////////////////
{
// optionsCache : { 'once memory' : { once : true , memory : true } }
var optionsCache = {};

// once memory，options.match( core_rnotwhite )=[once, memory]，function( _, flag )={once:true,memory:true}
function createOptions( options ) {
	var object = optionsCache[ options ] = {};//中括号就是json的点，没有点了。
	jQuery.each( options.match( core_rnotwhite ) || [], function( _, flag ) {
		object[ flag ] = true;
	});
	return object;
}

/*
	var cb = $.Callbacks();
	function aaa(){
		alert(1);
	}
	cb.add(aaa);
	(function(){
		function bbb(){
			alert(2);
		}
		cb.add(bbb);
	})();
	cb.fire();//1  2
 */
jQuery.Callbacks = function( options ) {//类的静态方法
	//options 可选： once memory unique stopOnFalse
	//方法：add remove has empty disable disabled lock locked fireWith fire fired
	//什么都不写走jQuery.extend( {}, options )，返回空{},不这样写，如果options===undefined，后面还要做兼容。
	options = typeof options === "string" ?
		( optionsCache[ options ] || createOptions( options ) ) :
		jQuery.extend( {}, options );//options={once:true,memory:true}

	var
		memory,
		fired,
		firing,
		firingStart,
		firingLength,
		firingIndex,
		// 添加的所有方法
		list = [],
		stack = !options.once && [],
		fire = function( data ) {
			memory = options.memory && data;//有memory返回true
			fired = true;//触发开始
			firingIndex = firingStart || 0;
			firingStart = 0;
			firingLength = list.length;
			firing = true;
			for ( ; list && firingIndex < firingLength; firingIndex++ ) {
				if ( list[ firingIndex ].apply( data[ 0 ], data[ 1 ] ) === false && options.stopOnFalse ) {// 函数返回false,有stopOnFalse属性就不向下执行
					memory = false; //memory也要置为false
					break;
				}
			}
			firing = false;//触发结束
			if ( list ) {
				if ( stack ) {
					if ( stack.length ) {
						fire( stack.shift() );
					}
				} else if ( memory ) {
					list = [];
				} else {
					self.disable();
				}
			}
		},
		self = {//对外部接口
			add: function() {
				if ( list ) {//list一上来是空数组，会返回真，
					var start = list.length;
					(function add( args ) {//args是形参
						jQuery.each( args, function( _, arg ) {//遍历传进来的多个方法名，
							var type = jQuery.type( arg );
							if ( type === "function" ) {
								if ( !options.unique || !self.has( arg ) ) {//不是unioqye，或者是unipue但是没有
									list.push( arg );
								}
							} else if ( arg && arg.length && type !== "string" ) {//数组，嵌套
								add( arg );
							}
						});
					})( arguments );//arguments是实参，方法名aaa,
					if ( firing ) {
						firingLength = list.length;
					} else if ( memory ) {//第一次没有赋值是undefined，
						firingStart = start;
						fire( memory );
					}
				}
				return this;
			},
			remove: function() {
				if ( list ) {
					jQuery.each( arguments, function( _, arg ) {//可以删除多个
						var index;
						while( ( index = jQuery.inArray( arg, list, index ) ) > -1 ) {
							list.splice( index, 1 );//删除
							if ( firing ) {
								if ( index <= firingLength ) {
									firingLength--;
								}
								if ( index <= firingIndex ) {
									firingIndex--;
								}
							}
						}
					});
				}
				return this;
			},
			has: function( fn ) {
				return fn ? jQuery.inArray( fn, list ) > -1 : !!( list && list.length );
			},
			empty: function() {
				list = [];
				firingLength = 0;
				return this;
			},
			disable: function() {
				list = stack = memory = undefined;
				return this;
			},
			disabled: function() {
				return !list;
			},
			lock: function() {
				stack = undefined;
				if ( !memory ) {
					self.disable();
				}
				return this;
			},
			locked: function() {
				return !stack;
			},
			fireWith: function( context, args ) {
				if ( list && ( !fired || stack ) ) {
					args = args || [];
					args = [ context, args.slice ? args.slice() : args ];
					if ( firing ) {
						stack.push( args );
					} else {
						fire( args );
					}
				}
				return this;
			},
			fire: function() {
				self.fireWith( this, arguments );//cb.fire('hello');
				return this;
			},
			fired: function() {
				return !!fired;
			}
		};

	return self;
};
}
///////////////////////////////////Callbacks END////////////////////////
///////////////////////////////////Deferred : 延迟对象 BEGIN////////////////////////
{
//延迟对象
jQuery.extend({

	Deferred: function( func ) {
		var tuples = [//resolve完成、reject未完成、notify进行中类似于fire，done、fail、progress回调函数的方法类似于add，jQuery.Callbacks()创建回调对象实现回调方法。映射数组。
				// action, add listener, listener list, final state
				[ "resolve", "done", jQuery.Callbacks("once memory"), "resolved" ],
				[ "reject", "fail", jQuery.Callbacks("once memory"), "rejected" ],
				[ "notify", "progress", jQuery.Callbacks("memory") ]
			],
			state = "pending",
			promise = {
				state: function() {
					return state;
				},
				always: function() {
					deferred.done( arguments ).fail( arguments );
					return this;
				},
				then: function( /* fnDone, fnFail, fnProgress */ ) {
					var fns = arguments;
					return jQuery.Deferred(function( newDefer ) {
						jQuery.each( tuples, function( i, tuple ) {
							var action = tuple[ 0 ],//得到状态
								fn = jQuery.isFunction( fns[ i ] ) && fns[ i ];//是函数得到这个函数，不是函数返回假，
							// deferred[ done | fail | progress ] for forwarding actions to newDefer
							deferred[ tuple[1] ](function() {
								var returned = fn && fn.apply( this, arguments );
								if ( returned && jQuery.isFunction( returned.promise ) ) {
									returned.promise()
										.done( newDefer.resolve )
										.fail( newDefer.reject )
										.progress( newDefer.notify );
								} else {
									newDefer[ action + "With" ]( this === promise ? newDefer.promise() : this, fn ? [ returned ] : arguments );
								}
							});
						});
						fns = null;
					}).promise();
				},
				//jQuery.extend( obj, promise )这个promise是根据函数闭包，向上去找的，把promise复制给obj，
				promise: function( obj ) {
					return obj != null ? jQuery.extend( obj, promise ) : promise;
				}
			},
			deferred = {};

		// Keep pipe for back-compat
		promise.pipe = promise.then;

		// 映射数组进行映射的函数
		jQuery.each( tuples, function( i, tuple ) {
			var list = tuple[ 2 ],//jQuery.Callbacks("once memory")
				stateString = tuple[ 3 ];//resolved

			// promise[ done | fail | progress ] = list.add=jQuery.Callbacks("once memory").add方法
			promise[ tuple[1] ] = list.add;

			// Handle state
			if ( stateString ) {
				list.add(function() {
					// state = [ resolved | rejected ]
					state = stateString;

				// [ reject_list | resolve_list ].disable; progress_list.lock
				}, tuples[ i ^ 1 ][ 2 ].disable, tuples[ 2 ][ 2 ].lock );
			}

			// deferred[ resolve | reject | notify ]
			deferred[ tuple[0] ] = function() {//给deferred这个json赋值
				deferred[ tuple[0] + "With" ]( this === deferred ? promise : this, arguments );
				return this;
			};
			// deferred[ resolveWith | rejectWith | notifyWith ]=jQuery.Callbacks("once memory").fireWith方法
			deferred[ tuple[0] + "With" ] = list.fireWith;//继续给deferred这个json赋值
		});

		// 把promise复制给deferred，deferred比promise多了3个方法，
		promise.promise( deferred );

		// Call given func if any
		if ( func ) {
			func.call( deferred, deferred );
		}

		// All done!
		return deferred;
	},

	// Deferred helper
	when: function( subordinate /* , ..., subordinateN */ ) {
		var i = 0,
			resolveValues = core_slice.call( arguments ),
			length = resolveValues.length,

			// 未完成函数的计数器，jQuery.isFunction( subordinate.promise ):subordinate的返回值是不是函数。
			remaining = length !== 1 || ( subordinate && jQuery.isFunction( subordinate.promise ) ) ? length : 0,

			// the master Deferred. If resolveValues consist of only a single Deferred, just use that.
			deferred = remaining === 1 ? subordinate : jQuery.Deferred(),

			// Update function for both resolve and progress values
			updateFunc = function( i, contexts, values ) {
				return function( value ) {
					contexts[ i ] = this;
					values[ i ] = arguments.length > 1 ? core_slice.call( arguments ) : value;
					if( values === progressValues ) {
						deferred.notifyWith( contexts, values );
					} else if ( !( --remaining ) ) {//减到0时触发resolveWith方法，
						deferred.resolveWith( contexts, values );
					}
				};
			},

			progressValues, progressContexts, resolveContexts;

		// add listeners to Deferred subordinates; treat others as resolved
		if ( length > 1 ) {
			progressValues = new Array( length );
			progressContexts = new Array( length );
			resolveContexts = new Array( length );
			for ( ; i < length; i++ ) {
				if ( resolveValues[ i ] && jQuery.isFunction( resolveValues[ i ].promise ) ) {
					resolveValues[ i ].promise()//返回值
						.done( updateFunc( i, resolveContexts, resolveValues ) )//触发完成函数
						.fail( deferred.reject )//触发失败函数
						.progress( updateFunc( i, progressContexts, progressValues ) );
				} else {
					--remaining;
				}
			}
		}

		//计时器为0时执行resolveWith方法，
		if ( !remaining ) {
			deferred.resolveWith( resolveContexts, resolveValues );
		}

		return deferred.promise();//执行done方法，
	}
});
}
///////////////////////////////////Deferred : 延迟对象 END////////////////////////
///////////////////////////////////support : 功能检测 BEGIN////////////////////////
{
//兼容性，support是做兼容性检测，检测完之后实施是通过钩子机制。
jQuery.support = (function( support ) {//右边函数会立即执行
	var input = document.createElement("input"),
		fragment = document.createDocumentFragment(),//文档碎片
		div = document.createElement("div"),
		select = document.createElement("select"),
		opt = select.appendChild( document.createElement("option") );

	// input.type默认是text,基本都有，
	if ( !input.type ) {
		return support;
	}
	//改成复选框
	input.type = "checkbox";

	//新版本value的值是'on',老版本value的值是'',所以新本版support.checkOn=true,老版本support.checkOn=false,就可以通过support.checkOn属性值进行浏览器类型判断。
	support.checkOn = input.value !== "";

	// 狐火chrome下拉子项默认是选中的，ie默认不选中。
	support.optSelected = opt.selected;

	// 定义初始值
	support.reliableMarginRight = true;
	support.boxSizingReliable = true;
	support.pixelPosition = false;

	// Make sure checked status is properly cloned
	// Support: IE9, IE10
	//先让input选中，然后克隆，再判断选中状态，火狐chromeIE10以上都是选中的，ie低版本不是选中。
	input.checked = true;
	support.noCloneChecked = input.cloneNode( true ).checked;

	// Make sure that the options inside disabled selects aren't marked as disabled
	// (WebKit marks them as disabled)
	//下拉菜单禁止，子项有没有禁止。
	select.disabled = true;
	support.optDisabled = !opt.disabled;

	// Check if an input maintains its value after becoming a radio
	// Support: IE9, IE10
	input = document.createElement("input");
	input.value = "t";
	input.type = "radio";
	support.radioValue = input.value === "t";

	// #11217 - WebKit loses check when the name is after the checked attribute
	input.setAttribute( "checked", "t" );
	input.setAttribute( "name", "t" );

	fragment.appendChild( input );

	// Support: Safari 5.1, Android 4.x, Android 2.3
	// old WebKit doesn't clone checked state correctly in fragments
	support.checkClone = fragment.cloneNode( true ).cloneNode( true ).lastChild.checked;

	// Support: Firefox, Chrome, Safari
	// Beware of CSP restrictions (https://developer.mozilla.org/en/Security/CSP)
	support.focusinBubbles = "onfocusin" in window;

	//首先定义一个div的背景剪切是内容剪切，然后复制一份设置背景剪切为空，然后看原来div的背景剪切还是不是内容剪切。
	div.style.backgroundClip = "content-box";
	div.cloneNode( true ).style.backgroundClip = "";
	support.clearCloneStyle = div.style.backgroundClip === "content-box";

	//下面的需要等dom加载完才能检测
	jQuery(function() {
		var container, marginDiv,
			// Support: Firefox, Android 2.3 (Prefixed box-sizing versions).
			//
			divReset = "padding:0;margin:0;border:0;display:block;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box",
			body = document.getElementsByTagName("body")[ 0 ];

		if ( !body ) {
			// Return for frameset docs that don't have a body
			return;
		}
		//创建一个container来检测
		container = document.createElement("div");
		container.style.cssText = "border:0;width:0;height:0;position:absolute;top:0;left:-9999px;margin-top:1px";

		// Check box-sizing and margin behavior.
		body.appendChild( container ).appendChild( div );
		div.innerHTML = "";
		// Support: Firefox, Android 2.3 (Prefixed box-sizing versions).
		div.style.cssText = "-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;padding:1px;border:1px;display:block;width:4px;margin-top:1%;position:absolute;top:1%";

		// Workaround failing boxSizing test due to offsetWidth returning wrong value
		// with some non-1 values of body zoom, ticket #13543
		jQuery.swap( body, body.style.zoom != null ? { zoom: 1 } : {}, function() {
			support.boxSizing = div.offsetWidth === 4;
		});

		// Use window.getComputedStyle because jsdom on node.js will break without it.
		if ( window.getComputedStyle ) {
			support.pixelPosition = ( window.getComputedStyle( div, null ) || {} ).top !== "1%";
			support.boxSizingReliable = ( window.getComputedStyle( div, null ) || { width: "4px" } ).width === "4px";

			// Support: Android 2.3
			// Check if div with explicit width and no margin-right incorrectly
			// gets computed margin-right based on width of container. (#3333)
			// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
			marginDiv = div.appendChild( document.createElement("div") );
			marginDiv.style.cssText = div.style.cssText = divReset;
			marginDiv.style.marginRight = marginDiv.style.width = "0";
			div.style.width = "1px";

			support.reliableMarginRight =
				!parseFloat( ( window.getComputedStyle( marginDiv, null ) || {} ).marginRight );
		}

		body.removeChild( container );
	});

	return support;//返回json
})( {} );//实参json
}
///////////////////////////////////support : 功能检测 END///////////////////////////
///////////////queue() : 队列方法 : 执行顺序的管理,data() : 数据缓存 begin//////////
{
/*
	Implementation Summary

	1. Enforce API surface and semantic compatibility with 1.9.x branch
	2. Improve the module's maintainability by reducing the storage
		paths to a single mechanism.
	3. Use the same single mechanism to support "private" and "user" data.
	4. _Never_ expose "private" data to user code (TODO: Drop _data, _removeData)
	5. Avoid exposing implementation details on user objects (eg. expando properties)
	6. Provide a clear path for implementation upgrade to WeakMap in 2014
*/
var data_user, data_priv,
	rbrace = /(?:\{[\s\S]*\}|\[[\s\S]*\])$/,
	rmultiDash = /([A-Z])/g;

function Data() {
	// cache = {0：｛｝ },并且这个0属性是不能被修改的。这个0是公用的。
	Object.defineProperty( this.cache = {}, 0, {
		get: function() {
			return {};
		}
	});
	//唯一标识，id
	this.expando = jQuery.expando + Math.random();
}
/*
var cache = {
    1 : {				//同一个元素只有一个id
        age : 30,
		job : 'it',
		'allName' : '妙味课堂'
    },
    2 : {
        age : obj
    }
*/
Data.uid = 1;//cache中可以累加的属性1,2,3

Data.accepts = function( owner ) {
	// 1是元素，2是document,都是可以在cache中分配id的。
	return owner.nodeType ?
		owner.nodeType === 1 || owner.nodeType === 9 : true;
};

Data.prototype = {
	//分配映射id或者0:空json
	key: function( owner ) {//owner是document.body或者$('#div1')对象，
		// 不是元素也不是document,就返回0，id就是0,在cache中返回空对象{},defineProperty中给cache定义的空对象。
		if ( !Data.accepts( owner ) ) {
			return 0;
		}
		var descriptor = {},
			// 获取$('#div1')的属性this.expando的值，
			unlock = owner[ this.expando ];
		if ( !unlock ) {
			unlock = Data.uid++;
			try {
				/*
				descriptor={jQuery203089541586732714850.8840931279098725:{value:1}}
				*/
				descriptor[ this.expando ] = { value: unlock };
				//给owner增加一个属性descriptor:json并且不能改变
				Object.defineProperties( owner, descriptor );

			// Support: Android < 4
			// Fallback to a less secure definition
			} catch ( e ) {
				//兼容性：通过extend给owner增加{key:value}的键值对，这个可以被修改descriptor={jQuery203089541586732714850.8840931279098725:1}
				descriptor[ this.expando ] = unlock;
				jQuery.extend( owner, descriptor );
			}
		}
		if ( !this.cache[ unlock ] ) {
			this.cache[ unlock ] = {};//cache={1:{}}
		}
		return unlock;
	},
	//设置cache的值
	set: function( owner, data, value ) {
		var prop,
			//找到这个元素的id和cache中的json
			unlock = this.key( owner ),
			cache = this.cache[ unlock ];//cache是某个id的json

		if ( typeof data === "string" ) {
			cache[ data ] = value;//是字符串，就把key value加进去
		//是json，$.data(document.body ,{ 'age' : 30 , 'job' : 'it' , 'allName' : '妙味课堂'});
		} else {
			// Fresh assignments by object are shallow copied
			if ( jQuery.isEmptyObject( cache ) ) {
				jQuery.extend( this.cache[ unlock ], data );//继承json过去
			// Otherwise, copy the properties one-by-one to the cache object
			} else {
				for ( prop in data ) {
					cache[ prop ] = data[ prop ];
				}
			}
		}
		return cache;
	},
	//获取cache中的值
	get: function( owner, key ) {
		var cache = this.cache[ this.key( owner ) ];

		return key === undefined ?
			cache : cache[ key ];
	},
	//set,get合体
	//queue = data_priv.access( elem, type,jQuery.makeArray(data) );
	access: function( owner, key, value ) {
		var stored;
		// In cases where either:
		//
		//   1. No key was specified
		//   2. A string key was specified, but no value provided
		//
		// Take the "read" path and allow the get method to determine
		// which value to return, respectively either:
		//
		//   1. The entire cache object
		//   2. The data stored at the key
		//
		if ( key === undefined ||
				((key && typeof key === "string") && value === undefined) ) {
			//没有key就全部取出来，有key没有value只取
			stored = this.get( owner, key );

			return stored !== undefined ?
				stored : this.get( owner, jQuery.camelCase(key) );
		}
		//有key有value,全部覆盖或者追加
		// [*]When the key is not a string, or both a key and value
		// are specified, set or extend (existing objects) with either:
		//
		//   1. An object of properties
		//   2. A key and value
		//
		this.set( owner, key, value );

		// Since the "set" path can have two possible entry points
		// return the expected data based on which path was taken[*]
		return value !== undefined ? value : key;
	},

	//移除cache
	//data_priv.remove( elem, [ type + "queue", type + "queueHooks"; ] );
	remove: function( owner, key ) {
		var i, name, camel,
			unlock = this.key( owner ),
			cache = this.cache[ unlock ];//cache是某一个key的cache,

		if ( key === undefined ) {//不指定key，这个元素所有的都清空。
			this.cache[ unlock ] = {};

		} else {
			// $.removeData(document.body , ['age','job','all-name']);
			if ( jQuery.isArray( key ) ) {
				//all-name找到allName
				name = key.concat( key.map( jQuery.camelCase ) );
			} else {
				camel = jQuery.camelCase( key );
				// Try the string as a key before any manipulation
				if ( key in cache ) {
					name = [ key, camel ];
				} else {
					// 转驼峰，去空格后在不在
					name = camel;
					name = name in cache ?
						[ name ] : ( name.match( core_rnotwhite ) || [] );
				}
			}

			i = name.length;
			while ( i-- ) {
				delete cache[ name[ i ] ];
			}
		}
	},
	hasData: function( owner ) {
		return !jQuery.isEmptyObject(
			this.cache[ owner[ this.expando ] ] || {}
		);
	},
	discard: function( owner ) {//删除1,2,这个整体
		if ( owner[ this.expando ] ) {
			delete this.cache[ owner[ this.expando ] ];
		}
	}
};

// These may be used throughout the jQuery core codebase
data_user = new Data();//cache就是依附在这个对象上
data_priv = new Data();

//对外提供的接口，通过$.直接调用。这个是方法的定义，准备给jQuery类调用的，里面的实现都是调用Data对象的实现。
jQuery.extend({
	acceptData: Data.accepts,

	hasData: function( elem ) {
		return data_user.hasData( elem ) || data_priv.hasData( elem );
	},

	data: function( elem, name, data ) {
		return data_user.access( elem, name, data );
	},

	removeData: function( elem, name ) {
		data_user.remove( elem, name );
	},

	// TODO: Now that all calls to _data and _removeData have been replaced
	// with direct calls to data_priv methods, these can be deprecated.
	//私有的，内部使用，不对外使用
	_data: function( elem, name, data ) {
		return data_priv.access( elem, name, data );
	},

	_removeData: function( elem, name ) {
		data_priv.remove( elem, name );
	}
});

//对外提供的接口，通过jQuery对象调用。设置一组元素时候是设置所有元素，获取元素只是获取第一个。
jQuery.fn.extend({
	data: function( key, value ) {
		var attrs, name,
			elem = this[ 0 ],//如果是一组div,就只要第一个，
			i = 0,
			data = null;

		// Gets all values
		if ( key === undefined ) {
			if ( this.length ) {//$('#div1')找不到得到
				data = data_user.get( elem );
//alert($('#div1').get(0).dataset.miaovAll);//h5特性，data-miaov-all="妙味"
//对h5特性的处理
				if ( elem.nodeType === 1 && !data_priv.get( elem, "hasDataAttrs" ) ) {
					attrs = elem.attributes;//元素所有属性数组集合[title='123',class='box',data-miaov-all='苗圩',id='div1']
					for ( ; i < attrs.length; i++ ) {
						name = attrs[ i ].name;//属性的名字

						if ( name.indexOf( "data-" ) === 0 ) {
							//miaov-all转成miaoAll，js中不要出现横杆
							name = jQuery.camelCase( name.slice(5) );
							//存入cache
							dataAttr( elem, name, data[ name ] );
						}
					}
					data_priv.set( elem, "hasDataAttrs", true );
				}
			}

			return data;
		}

		// Sets multiple    values  $('#div1').data({name:'hello',age:'30'});
		if ( typeof key === "object" ) {
			return this.each(function() {
				data_user.set( this, key );
			});
		}

		return jQuery.access( this, function( value ) {
			var data,
				camelKey = jQuery.camelCase( key );

			// The calling jQuery object (element matches) is not empty
			// (and therefore has an element appears at this[ 0 ]) and the
			// `value` parameter was not undefined. An empty jQuery object
			// will result in `undefined` for elem = this[ 0 ] which will
			// throw an exception if an attempt to read a data cache is made.
			if ( elem && value === undefined ) {
				// Attempt to get data from the cache
				// with the key as-is
				data = data_user.get( elem, key );
				if ( data !== undefined ) {
					return data;
				}

				// Attempt to get data from the cache
				// with the key camelized
				data = data_user.get( elem, camelKey );
				if ( data !== undefined ) {
					return data;
				}

				// Attempt to "discover" the data in
				// HTML5 custom data-* attrs
				data = dataAttr( elem, camelKey, undefined );
				if ( data !== undefined ) {
					return data;
				}

				// We tried really hard, but the data doesn't exist.
				return;
			}

			// Set the data...
			this.each(function() {
				// First, attempt to store a copy or reference of any
				// data that might've been store with a camelCased key.
				var data = data_user.get( this, camelKey );

				// For HTML5 data-* attribute interop, we have to
				// store property names with dashes in a camelCase form.
				// This might not apply to all properties...*
				data_user.set( this, camelKey, value );

				// *... In the case of properties that might _actually_
				// have dashes, we need to also store a copy of that
				// unchanged property.
				if ( key.indexOf("-") !== -1 && data !== undefined ) {
					data_user.set( this, key, value );
				}
			});
		}, null, value, arguments.length > 1, null, true );
	},

	removeData: function( key ) {
		return this.each(function() {
			data_user.remove( this, key );
		});
	}
});

function dataAttr( elem, key, data ) {
	var name;

	// If nothing was found internally, try to fetch any
	// data from the HTML5 data-* attribute
	if ( data === undefined && elem.nodeType === 1 ) {
		name = "data-" + key.replace( rmultiDash, "-$1" ).toLowerCase();
		data = elem.getAttribute( name );

		if ( typeof data === "string" ) {
			try {
				data = data === "true" ? true :
					data === "false" ? false :
					data === "null" ? null :
					// Only convert to a number if it doesn't change the string
					+data + "" === data ? +data :
					rbrace.test( data ) ? JSON.parse( data ) :
					data;
			} catch( e ) {}

			// Make sure we set the data so it isn't changed later
			data_user.set( elem, key, data );
		} else {
			data = undefined;
		}
	}
	return data;
}

//对外接口
jQuery.extend({
	queue: function( elem, type, data ) {//入队。元素、队列名字、存进去的函数
	//jQuery.queue( this, type, function( next, hooks ) {})
		var queue;

		if ( elem ) {
			type = ( type || "fx" ) + "queue";//不写队列名字就是fx
			//	$.queue( document , 'q1' , aaa||[aaa,bbb] );
			queue = data_priv.get( elem, type );//get方法var cache = this.cache[ this.key( elem ) ];return type === undefined ? cache : cache[ type ];key方法return unlock = elem[ this.expando ];根据元素的唯一标识expando获取在data_priv对象中缓存中的1,2,3,4这个unlock数字，根据unlock这个数字获取cache中的json,根据type获取json中的值
			/*
			data_priv = {
				1(document.203089541586732714850=1):{
					name(type):'哈哈'(queue),
					q1queue(type)：...(queue数组),
				}
			}
			*/

			// Speed up dequeue by getting out quickly if this is just a lookup
			if ( data ) {//函数名
				if ( !queue || jQuery.isArray( data ) ) {//queue没有（函数是不是数组）或者queue有但是函数是数组,注意是数组就会把之前的全部覆盖。
					/*
					$.queue( document , 'q1' , aaa );
					$.queue( document , 'q1' , bbb );
					$.queue( document , 'q1' , [ccc] );
					*/
					queue = data_priv.access( elem, type, jQuery.makeArray(data) );
				} else {//queue有(说明q1队列之前加过)并且函数不是数组直接push，注意queue没有的时候queue始终存的是一个数组
					queue.push( data );
				}
			}
			return queue || [];
		}
	},

	dequeue: function( elem, type ) {
		type = type || "fx";
//只能写jQuery.queue()，不能写queue(),queue()是jQuery类的静态方法，只能通过静态方式调用。
/*
jQuery.extend(  {a:function(){alert(1)},b:function(){jQuery.a();}}    )
$.b();
*/
		var queue = jQuery.queue( elem, type ),//得到type对应的值，是一个数组，
			startLength = queue.length,
			fn = queue.shift(),//去除数组第一个
			hooks = jQuery._queueHooks( elem, type ),
			next = function() {
				jQuery.dequeue( elem, type );//下一个，不能直接写dequeue，这行语句还没执行完时dequeue是不存在的
			};

		// If the fx queue is dequeued, always remove the progress sentinel
		if ( fn === "inprogress" ) {
			fn = queue.shift();
			startLength--;
		}

		if ( fn ) {

			// Add a progress sentinel to prevent the fx queue from being
			// automatically dequeued
			if ( type === "fx" ) {
				queue.unshift( "inprogress" );//inprogress添进去
			}

			// clear up the last queue stop function
			delete hooks.stop;
			fn.call( elem, next, hooks );//出队的函数执行，
		}

		if ( !startLength && hooks ) {
			hooks.empty.fire();
		}
	},

	/*
	data_priv = {
		1(elem:document.203089541586732714850=1):{
			name(type):'哈哈'(queue),
			q1queue(type)：...(queue数组),
		}
	}
	*/
	_queueHooks: function( elem, type ) {
		var key = type + "queueHooks";
		//有就获取，没有key,value都存在value是json就追加
		return data_priv.get( elem, key ) || data_priv.access( elem, key, {
			empty: jQuery.Callbacks("once memory").add(function() {
				data_priv.remove( elem, [ type + "queue", key ] );
			})
		});
	}
});

jQuery.fn.extend({
	//this.queue( type, function( next, hooks ) {
	//$('#div').queue('q1',bbb);
	queue: function( type, data ) {
		var setter = 2;
		//$('#div').queue(bbb);
		if ( typeof type !== "string" ) {//只传了一个函数，没有type
			data = type;
			type = "fx";
			setter--;
		}
///console.log( $('#div').queue('q1') );  查看
		if ( arguments.length < setter ) {
			return jQuery.queue( this[0], type );//静态方法调用
		}

		return data === undefined ?
			this :
			this.each(function() {//$('#div')是一个数组，对每一个设置
				var queue = jQuery.queue( this, type, data );//每一个入队

				// ensure a hooks for this queue
				jQuery._queueHooks( this, type );

				if ( type === "fx" && queue[0] !== "inprogress" ) {
					jQuery.dequeue( this, type );//第一个入队然后立即出队，调用
				}
			});
	},
	dequeue: function( type ) {
		return this.each(function() {
			jQuery.dequeue( this, type );//每一个出队
		});
	},

	//.delay(2000)
	/*
	jQuery.fx.speeds = {
		slow: 600,
		fast: 200,
		// Default speed
		_default: 400
	};
	*/
	//jQuery.fx = Tween.prototype.init;
	delay: function( time, type ) {
		time = jQuery.fx ? jQuery.fx.speeds[ time ] || time : time;
		type = type || "fx";
//queue第二个参数是匿名函数，也添加进去
		return this.queue( type, function( next, hooks ) {
			var timeout = setTimeout( next, time );
			hooks.stop = function() {
				clearTimeout( timeout );
			};
		});
	},
	clearQueue: function( type ) {
		return this.queue( type || "fx", [] );//空数组是真
	},
	//队列全部执行完之后，再去调用
	promise: function( type, obj ) {
		var tmp,
			count = 1,
			defer = jQuery.Deferred(),
			elements = this,
			i = this.length,
			resolve = function() {
				if ( !( --count ) ) {
					defer.resolveWith( elements, [ elements ] );
				}
			};

		if ( typeof type !== "string" ) {
			obj = type;
			type = undefined;
		}
		type = type || "fx";

		while( i-- ) {
			tmp = data_priv.get( elements[ i ], type + "queueHooks" );
			if ( tmp && tmp.empty ) {
				count++;
				tmp.empty.add( resolve );
			}
		}
		resolve();
		return defer.promise( obj );
	}
});
}
//////////////////queue() : 队列方法 : 执行顺序的管理,data() : 数据缓存 END///////////////
////////////////attr() prop() val() addClass()等 : 对元素属性的操作BEGIN////////////
{
var nodeHook, boolHook,
	rclass = /[\t\r\n\f]/g,
	rreturn = /\r/g,
	rfocusable = /^(?:input|select|textarea|button)$/i;

jQuery.fn.extend({
	attr: function( name, value ) {
//遍历this
//arguments.length > 1,jQuery.attr(this[i],name,value),返回this
//arguments.length <= 1,jQuery.attr(this[i],name,value),返回this
		return jQuery.access( this, jQuery.attr, name, value, arguments.length > 1 );
	},

	removeAttr: function( name ) {
		return this.each(function() {
			jQuery.removeAttr( this, name );
		});
	},

	prop: function( name, value ) {
		return jQuery.access( this, jQuery.prop, name, value, arguments.length > 1 );
	},

	removeProp: function( name ) {
		return this.each(function() {
			delete this[ jQuery.propFix[ name ] || name ];
		});
	},

	//$('.div1').addClass('box2 box3');
	addClass: function( value ) {
		var classes, elem, cur, clazz, j,
			i = 0,
			len = this.length,
			proceed = typeof value === "string" && value;//是字符串返回字符串，不是返回flase
		/*
			$('div').addClass( function(index){
				alert(index);
				return 'box'+index;
			});
		*/
		if ( jQuery.isFunction( value ) ) {
			console.log(this);//这里的this是jQuery对象，Object { 0: <div#div1.box>, 1: <div#div2.box>, 2: <div#div3.box>, length: 3},通过return ( context || rootjQuery ).find('.div1')原生方法获得，里面每一个是节点对象不是jQuery对象
			return this.each(function( j ) {
				console.log(this);//这里不是jQuery对象是dom节点对象，<div id='div1'></div>，<div id='div2'></div>，<div id='div3'></div>
				console.log(jQuery( this ));//jQuery( this )是jQuery对象，Object { 0: <div#div1.box>, context: <div#div1.box>, length: 1 }，Object { 0: <div#div2.box>, context: <div#div2.box>, length: 1 }，Object { 0: <div#div3.box>, context: <div#div3.box>, length: 1 }
				/*jQuery( this )走的是
				if ( selector.nodeType ) {//节点都有nodeType属性
				this.context = this[0] = selector;
				this.length = 1;
				return this;*/
				jQuery( this ).addClass( value.call( this, j, this.className ) );
			});
		}
		if ( proceed ) {
			// 把字符串正则分割成数组
			classes = ( value || "" ).match( core_rnotwhite ) || [];
			for ( ; i < len; i++ ) {
				elem = this[ i ];
				//不是元素节点返回false，elem.className元素有没有class属性，有就合并（重复不合并），cur是之前的class
				cur = elem.nodeType === 1 && ( elem.className ?
				//非空格转换成空格
					( " " + elem.className + " " ).replace( rclass, " " ) :
					" "
				);
				if ( cur ) {
					j = 0;
					while ( (clazz = classes[j++]) ) {
						if ( cur.indexOf( " " + clazz + " " ) < 0 ) {
							cur += clazz + " ";
						}
					}//前后去空格
					elem.className = jQuery.trim( cur );
				}
			}
		}
		return this;
	},

	removeClass: function( value ) {
		var classes, elem, cur, clazz, j,
			i = 0,
			len = this.length,
			//先执行&&再||，proceed为true参数长度是0删除所有或者参数是字符串，为false传的不是字符串
			proceed = arguments.length === 0 || typeof value === "string" && value;
		if ( jQuery.isFunction( value ) ) {
			return this.each(function( j ) {
				jQuery( this ).removeClass( value.call( this, j, this.className ) );
			});
		}
		if ( proceed ) {
			classes = ( value || "" ).match( core_rnotwhite ) || [];
			for ( ; i < len; i++ ) {
				elem = this[ i ];
				// This expression is here for better compressibility (see addClass)
				cur = elem.nodeType === 1 && ( elem.className ?
					( " " + elem.className + " " ).replace( rclass, " " ) :
					""
				);
				if ( cur ) {
					j = 0;
					while ( (clazz = classes[j++]) ) {
						// Remove *all* instances
						while ( cur.indexOf( " " + clazz + " " ) >= 0 ) {
							cur = cur.replace( " " + clazz + " ", " " );
						}
					}
					elem.className = value ? jQuery.trim( cur ) : "";
				}
			}
		}
		return this;
	},

	toggleClass: function( value, stateVal ) {
		var type = typeof value;
	//$('#div1').toggleClass('box2 box3',true);//有没有都是add
	//$('#div1').toggleClass('box2 box3',false);//有没有都是删除
		if ( typeof stateVal === "boolean" && type === "string" ) {//真就添加，假就删除
			return stateVal ? this.addClass( value ) : this.removeClass( value );
		}

		if ( jQuery.isFunction( value ) ) {
			return this.each(function( i ) {
				jQuery( this ).toggleClass( value.call(this, i, this.className, stateVal), stateVal );
			});
		}
		//$('#div1').toggleClass('box2 box3')
		return this.each(function() {
			if ( type === "string" ) {
				// toggle individual class names
				var className,
					i = 0,
					self = jQuery( this ),//转成jQuery对象，hasClass是jQuery对象的方法。
					//空格分割成数组
					classNames = value.match( core_rnotwhite ) || [];

				while ( (className = classNames[ i++ ]) ) {
					// check each className given, space separated list
					if ( self.hasClass( className ) ) {
						self.removeClass( className );
					} else {
						self.addClass( className );
					}
				}

			// Toggle whole class name
			//$('#div1').toggleClass(false);
			} else if ( type === core_strundefined || type === "boolean" ) {
				if ( this.className ) {
					// store className if set
					data_priv.set( this, "__className__", this.className );
				}

				// If the element has a class name or if we're passed "false",
				// then remove the whole classname (if there was one, the above saved it).
				// Otherwise bring back whatever was previously saved (if anything),
				// falling back to the empty string if nothing was stored.
				this.className = this.className || value === false ? "" : data_priv.get( this, "__className__" ) || "";
			}
		});
	},

	hasClass: function( selector ) {
		var className = " " + selector + " ",
			i = 0,
			l = this.length;
		for ( ; i < l; i++ ) {
			if ( this[i].nodeType === 1 && (" " + this[i].className + " ").replace(rclass, " ").indexOf( className ) >= 0 ) {
				return true;
			}
		}

		return false;
	},

	val: function( value ) {
		var hooks, ret, isFunction,
			elem = this[0];
		//$('#input1').val()
		if ( !arguments.length ) {//获取
			if ( elem ) {//只获取第一个元素
			//hooks兼容处理,jQuery.valHooks[ elem.type ]在valHooks 这个json中找不到就找jQuery.valHooks[ elem.nodeName.toLowerCase() ]
				hooks = jQuery.valHooks[ elem.type ] || jQuery.valHooks[ elem.nodeName.toLowerCase() ];
/*
valHooks: {
hooks = option: {   //elem.type || elem.nodeName.toLowerCase()
			get: function( elem ) {}
		},
hooks = select: {
			get: function( elem ) {},
			set: function( elem, value ) {}
		}
		下面的：
hooks = radio: {
			set: function( elem ) {}
			get: function( elem, value ) {}
		},
hooks = checkbox: {
			set: function( elem ) {},
			get: function( elem, value ) {}
		}
}
*/
				if ( hooks && "get" in hooks && (ret = hooks.get( elem, "value" )) !== undefined ) {
					return ret;
				}
				//不再hooks里面
				ret = elem.value;

				return typeof ret === "string" ?
					// handle most common string cases
					ret.replace(rreturn, "") :
					// handle cases where value is null/undef or number
					ret == null ? "" : ret;
			}

			return;
		}
		//设置
		isFunction = jQuery.isFunction( value );

		return this.each(function( i ) {
			var val;
			if ( this.nodeType !== 1 ) {
				return;
			}
			if ( isFunction ) {
				val = value.call( this, i, jQuery( this ).val() );
			} else {
				val = value;
			}
			// Treat null/undefined as ""; convert numbers to string
			if ( val == null ) {//$('#input1').val(null);
				val = "";
			} else if ( typeof val === "number" ) {//$('#input1').val(123123);
				val += "";//转成字符串
			} else if ( jQuery.isArray( val ) ) {//$('#input2').val(['hello']);
				val = jQuery.map(val, function ( value ) {
					return value == null ? "" : value + "";
				});
			}
			hooks = jQuery.valHooks[ this.type ] || jQuery.valHooks[ this.nodeName.toLowerCase() ];
			// If set returns undefined, fall back to normal setting
			if ( !hooks || !("set" in hooks) || hooks.set( this, val, "value" ) === undefined ) {
				this.value = val;
			}
		});
	}
});

jQuery.extend({//静态属性只能通过jQuery静态方式调
	valHooks: {//option-get,select-get.select-set  兼容性处理
		option: {
			get: function( elem ) {
				// attributes.value is undefined in Blackberry 4.7 but
				// uses .value. See #6932
				var val = elem.attributes.value;
				//val不存在输出elem.value，val存在specified为false走elem.text
				return !val || val.specified ? elem.value : elem.text;
			}
		},
		select: {
			//$('select').val()
			get: function( elem ) {
				var value, option,
					options = elem.options,//下拉选项
					index = elem.selectedIndex,//当前索引值
					//select只选了一个或者没有选，one为true,就是单选
					one = elem.type === "select-one" || index < 0,
					//one为true时单选values是空，one是false时多选values是一个数组存储所有的选择的多个
					values = one ? null : [],
					//单选时max是当前索引加1，多选时是下拉选项的长度
					max = one ? index + 1 : options.length,
					//
					i = index < 0 ?
						max /*index < 0没有选择时one=true,i=max=0*/
						:one ?
						index/*index >= 0有选择时,select-one单选one=true,i=index,max=index+1，*/
						:0   /*index >= 0有选择时,不是select-one多选one=false,i=0,max=options.length*/
					;

				// 没有选择不进入循环，不获取select的val()
				//有选择单选，i=index,只获取index的val()
				//有选择好多选，全部获取
				for ( ; i < max; i++ ) {
					option = options[ i ];//js对象

					// IE6-9 doesn't update selected after form reset (#2551)
					if ( ( option.selected || i === index ) &&
							// Don't return options that are disabled or in a disabled optgroup
							( jQuery.support.optDisabled ? !option.disabled : option.getAttribute("disabled") === null ) &&
							( !option.parentNode.disabled || !jQuery.nodeName( option.parentNode, "optgroup" ) ) ) {

						// Get the specific value for the option
						value = jQuery( option ).val();//转成jQuery对象

						// We don't need an array for one selects
						if ( one ) {
							return value;
						}

						// Multi-Selects return an array
						values.push( value );
					}
				}

				return values;
			},
			//	$('#select').val(111);//111被选中了
			set: function( elem, value ) {
				var optionSet, option,
					options = elem.options,//所有的下拉选项，js对象
					values = jQuery.makeArray( value ),//转成数组
					i = options.length;

				while ( i-- ) {//遍历
					option = options[ i ];
					if ( (option.selected = jQuery.inArray( jQuery(option).val(), values ) >= 0) ) {//在数组里面就把她设为选中
						optionSet = true;
					}
				}

				// force browsers to behave consistently when non-matching value is set
				if ( !optionSet ) {//都没有
					elem.selectedIndex = -1;
				}
				return values;
			}
		}
	},

	attr: function( elem, name, value ) {
		var hooks, ret,
			nType = elem.nodeType;

		// 节点不存在，或者文本、属性、注释节点
		if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
			return;
		}

		// core_strundefined = typeof undefined,
		if ( typeof elem.getAttribute === core_strundefined ) {
			//$(document).attr('title','hello'); 走这里通过.设置
			return jQuery.prop( elem, name, value );
		}

		// 1是元素节点，
		if ( nType !== 1 || !jQuery.isXMLDoc( elem ) ) {
			name = name.toLowerCase();
			//只有type才做兼容性处理
			hooks = jQuery.attrHooks[ name ] ||
			//$('input').attr('checked',true);//没问题，做兼容了
				( jQuery.expr.match.bool.test( name ) ? boolHook : nodeHook );
		}

		if ( value !== undefined ) {//设置
//$('#div1').attr('miaov'，null); 调用remove
			if ( value === null ) {
				jQuery.removeAttr( elem, name );
//hooks中，set方法存在，就调用set方法并且返回值存在，就返回返回值
			} else if ( hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ) {
				return ret;//有兼容性执行兼容操作，返回值

			} else {//没有兼容性操作设置值
				elem.setAttribute( name, value + "" );
				return value;
			}
//hooks中，get方法存在，就调用get方法并且返回值存在，就返回返回值
		} else if ( hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ) {//获取，有兼容性返回值
			return ret;

		} else {//获取没有兼容性时
			ret = jQuery.find.attr( elem, name );

			// Non-existent attributes return null, we normalize to undefined
			return ret == null ?
				undefined :
				ret;
		}
	},

	removeAttr: function( elem, value ) {
		var name, propName,
			i = 0,
			//$('#div1').removeAttr('maio href id');
			attrNames = value && value.match( core_rnotwhite );//core_rnotwhite = /\S+/g, 非空格，返回数组

		if ( attrNames && elem.nodeType === 1 ) {
			while ( (name = attrNames[i++]) ) {
				/*
				propFix: {
					"for": "htmlFor",
					"class": "className"
				},
				*///  $('#div1').removeAttr('class');
				propName = jQuery.propFix[ name ] || name;

				// Boolean attributes get special treatment (#10870)
				if ( jQuery.expr.match.bool.test( name ) ) {
					// $('#div1').removeAttr('checked');
					elem[ propName ] = false;
				}

				elem.removeAttribute( name );//调用原生
			}
		}
	},
//hooks = jQuery.attrHooks[ name ]
	attrHooks: {
		type: {//只有name = 'type',才会有有兼容性判断。
			set: function( elem, value ) {//只有set说明兼容只是针对设置没有获取
				if ( !jQuery.support.radioValue && value === "radio" && jQuery.nodeName(elem, "input") ) {//单选值的兼容
					// Setting the type on a radio button after the value resets the value in IE6-9
					// Reset value to default in case type is set after value during creation

					//当设置type = 'radio'时IE会有兼容性问题，所以要先设置类型才设置值
					var val = elem.value;
					elem.setAttribute( "type", value );
					if ( val ) {
						elem.value = val;
					}
					return value;
				}
			}
		}
	},

	propFix: {
		"for": "htmlFor",
		"class": "className"
	},

	prop: function( elem, name, value ) {
		var ret, hooks, notxml,
			nType = elem.nodeType;

		// don't get/set properties on text, comment and attribute nodes
		if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
			return;
		}

		notxml = nType !== 1 || !jQuery.isXMLDoc( elem );

		if ( notxml ) {
			// Fix name and attach hooks
			name = jQuery.propFix[ name ] || name;
			hooks = jQuery.propHooks[ name ];//兼容性处理
		}

		if ( value !== undefined ) {//设置值
			return hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ?
				ret :
				( elem[ name ] = value );//prop使用的是.操作

		} else {//获取值
			return hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ?
				ret :
				elem[ name ];
		}
	},

	propHooks: {
		tabIndex: {//光标切换顺序，只对tabIndex属性做兼容
			get: function( elem ) {//只对get方法做兼容
				return elem.hasAttribute( "tabindex" ) || rfocusable.test( elem.nodeName ) || elem.href ?
					elem.tabIndex :
					-1;
			}
		}
	}
});

// Hooks for boolean attributes
boolHook = {
	set: function( elem, value, name ) {
		if ( value === false ) {
			// Remove boolean attributes when set to false
			jQuery.removeAttr( elem, name );
		} else {
			elem.setAttribute( name, name );
		}
		return name;
	}
};
jQuery.each( jQuery.expr.match.bool.source.match( /\w+/g ), function( i, name ) {
	var getter = jQuery.expr.attrHandle[ name ] || jQuery.find.attr;

	jQuery.expr.attrHandle[ name ] = function( elem, name, isXML ) {
		var fn = jQuery.expr.attrHandle[ name ],
			ret = isXML ?
				undefined :
				/* jshint eqeqeq: false */
				// Temporarily disable this handler to check existence
				(jQuery.expr.attrHandle[ name ] = undefined) !=
					getter( elem, name, isXML ) ?

					name.toLowerCase() :
					null;

		// Restore handler
		jQuery.expr.attrHandle[ name ] = fn;

		return ret;
	};
});

// Support: IE9+
// Selectedness for an option in an optgroup can be inaccurate
if ( !jQuery.support.optSelected ) {
	jQuery.propHooks.selected = {
		get: function( elem ) {
			var parent = elem.parentNode;
			if ( parent && parent.parentNode ) {
				parent.parentNode.selectedIndex;
			}
			return null;
		}
	};
}

jQuery.each([
	"tabIndex",
	"readOnly",
	"maxLength",
	"cellSpacing",
	"cellPadding",
	"rowSpan",
	"colSpan",
	"useMap",
	"frameBorder",
	"contentEditable"
], function() {
	//value = callback.call( obj[ i ], i, obj[ i ] );
	jQuery.propFix[ this.toLowerCase() ] = this;
});

/*
valHooks: {
hooks = radio: {
			set: function( elem ) {}
			get: function( elem, value ) {}
		},
hooks = checkbox: {
			set: function( elem ) {},
			get: function( elem, value ) {}
		}
}
*/
jQuery.each([ "radio", "checkbox" ], function() {
	jQuery.valHooks[ this ] = {
		//$('#radio').val(['hello']);
		set: function( elem, value ) {
			if ( jQuery.isArray( value ) ) {
				return ( elem.checked = jQuery.inArray( jQuery(elem).val(), value ) >= 0 );//设置选中状态
			}
		}
	};
	if ( !jQuery.support.checkOn ) {
	//有的话做处理，没有不做处理	//获取单选框和复选框的value值时绝大多数浏览器返回的都是on，有些是空的，
		jQuery.valHooks[ this ].get = function( elem ) {
			// Support: Webkit
			// "" is returned instead of "on" if a value isn't specified
			return elem.getAttribute("value") === null ? "on" : elem.value;
		};
	}
});

}
//////////////////attr() prop() val() addClass()等 : 对元素属性的操作END////////////
//////////////////事件操作begin////////////////////////////////////
{
var rkeyEvent = /^key/,
	rmouseEvent = /^(?:mouse|contextmenu)|click/,
	rfocusMorph = /^(?:focusinfocus|focusoutblur)$/,
	rtypenamespace = /^([^.]*)(?:\.(.+)|)$/;

function returnTrue() {
	return true;
}

function returnFalse() {
	return false;
}

function safeActiveElement() {
	try {
		return document.activeElement;
	} catch ( err ) { }
}

/*
 * Helper functions for managing events -- not part of the public interface.
 * Props to Dean Edwards' addEvent library for many of the ideas.
 */
jQuery.event = {

	global: {},
//add( $('#div1'), 'click.bbb.aaa', fn, {name:'hello'}, 'li' )
	add: function( elem, types, handler, data, selector ) {

		var handleObjIn, eventHandle, tmp,
			events, t, handleObj,
			special, handlers, type, namespaces, origType,
			elemData = data_priv.get( elem );
		if ( !elemData ) {
			return;
		}

		// Caller can pass in an object of custom data in lieu of the handler
		if ( handler.handler ) {
			handleObjIn = handler;
			handler = handleObjIn.handler;
			selector = handleObjIn.selector;
		}

		// Make sure that the handler has a unique ID, used to find/remove it later
		if ( !handler.guid ) {
			handler.guid = jQuery.guid++;//函数有一个guid
		}

		// Init the element's event structure and main handler, if this is the first
//span.listeners = span.listeners || {};
		if ( !(events = elemData.events) ) {
			events = elemData.events = {}; //不存在就创建
		}
		if ( !(eventHandle = elemData.handle) ) {
			eventHandle = elemData.handle = function( e ) {
				// Discard the second event of a jQuery.event.trigger() and
				// when an event is called after a page has unloaded
				return typeof jQuery !== core_strundefined && (!e || jQuery.event.triggered !== e.type) ?
				//发送事件
					jQuery.event.dispatch.apply( eventHandle.elem, arguments ) :
					undefined;
			};
			// Add elem as a property of the handle fn to prevent a memory leak with IE non-native events
			eventHandle.elem = elem;
		}

		// $('#div1').on('click mouseover mousedown',function(a){})
		types = ( types || "" ).match( core_rnotwhite ) || [""];
		t = types.length;
		while ( t-- ) {
			// $('#div1').on('click.bbb.aaa',function(a){})
			tmp = rtypenamespace.exec( types[t] ) || [];
			type = origType = tmp[1];
			//命名空间排序
			namespaces = ( tmp[2] || "" ).split( "." ).sort();

			// There *must* be a type, no attaching namespace-only handlers
			if ( !type ) {
				continue;
			}

			//处理特殊事件
			special = jQuery.event.special[ type ] || {};

			// If selector defined, determine special event api type, otherwise given type
			type = ( selector ? special.delegateType : special.bindType ) || type;

			// Update special based on newly reset type
			special = jQuery.event.special[ type ] || {};

			// handleObj is passed to all event handlers
			handleObj = jQuery.extend({
				type: type,
				origType: origType,
				data: data,
				handler: handler,
				guid: handler.guid,//guid是函数的guid
				selector: selector,
				needsContext: selector && jQuery.expr.match.needsContext.test( selector ),
				namespace: namespaces.join(".")
			}, handleObjIn );

			// Init the event handler queue if we're the first
//span.listeners[eventName] = span.listeners[eventName] || [];
			if ( !(handlers = events[ type ]) ) {
				handlers = events[ type ] = [];
				handlers.delegateCount = 0;//委托计数

				// Only use addEventListener if the special events handler returns false
//obj.addEventListener(eventName,fn,false);
				if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {
					if ( elem.addEventListener ) {
//自带事件绑定，自定义事件走这里但是没有任何效果，
						elem.addEventListener( type, eventHandle, false );
					}
				}
			}

			if ( special.add ) {
				special.add.call( elem, handleObj );

				if ( !handleObj.handler.guid ) {
					handleObj.handler.guid = handler.guid;
				}
			}

			// Add to the element's handler list, delegates in front
//obj.listeners[eventName].push(fn);
			if ( selector ) {
				handlers.splice( handlers.delegateCount++, 0, handleObj );
			} else {
				handlers.push( handleObj );
			}

			// Keep track of which events have ever been used, for event optimization
			jQuery.event.global[ type ] = true;
		}

		// Nullify elem to prevent memory leaks in IE
		elem = null;//防止内存泄漏，
	},

	// Detach an event or set of events from an element
	remove: function( elem, types, handler, selector, mappedTypes ) {

		var j, origCount, tmp,
			events, t, handleObj,
			special, handlers, type, namespaces, origType,
			elemData = data_priv.hasData( elem ) && data_priv.get( elem );

		if ( !elemData || !(events = elemData.events) ) {
			return;
		}

		// Once for each type.namespace in types; type may be omitted
		types = ( types || "" ).match( core_rnotwhite ) || [""];
		t = types.length;
		while ( t-- ) {
			tmp = rtypenamespace.exec( types[t] ) || [];
			type = origType = tmp[1];
			namespaces = ( tmp[2] || "" ).split( "." ).sort();

			// Unbind all events (on this namespace, if provided) for the element
			if ( !type ) {
				for ( type in events ) {
					jQuery.event.remove( elem, type + types[ t ], handler, selector, true );
				}
				continue;
			}

			special = jQuery.event.special[ type ] || {};
			type = ( selector ? special.delegateType : special.bindType ) || type;
			handlers = events[ type ] || [];
			tmp = tmp[2] && new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" );

			// Remove matching events
			origCount = j = handlers.length;
			while ( j-- ) {
				handleObj = handlers[ j ];

				if ( ( mappedTypes || origType === handleObj.origType ) &&
					( !handler || handler.guid === handleObj.guid ) &&
					( !tmp || tmp.test( handleObj.namespace ) ) &&
					( !selector || selector === handleObj.selector || selector === "**" && handleObj.selector ) ) {
					handlers.splice( j, 1 );

					if ( handleObj.selector ) {
						handlers.delegateCount--;
					}
					if ( special.remove ) {
						special.remove.call( elem, handleObj );
					}
				}
			}

			// Remove generic event handler if we removed something and no more handlers exist
			// (avoids potential for endless recursion during removal of special event handlers)
//obj.removeEventListener(eventName,fn,false);
			if ( origCount && !handlers.length ) {
				if ( !special.teardown || special.teardown.call( elem, namespaces, elemData.handle ) === false ) {
					jQuery.removeEvent( elem, type, elemData.handle );
				}
//delete obj.listeners[eventName];  针对自定义事件操作
				delete events[ type ];
			}
		}

		// Remove the expando if it's no longer used
		if ( jQuery.isEmptyObject( events ) ) {
			delete elemData.handle;
			data_priv.remove( elem, "events" );
		}
	},

	trigger: function( event, data, elem, onlyHandlers ) {

		var i, cur, tmp, bubbleType, ontype, handle, special,
			eventPath = [ elem || document ],
			type = core_hasOwn.call( event, "type" ) ? event.type : event,
			namespaces = core_hasOwn.call( event, "namespace" ) ? event.namespace.split(".") : [];

		cur = tmp = elem = elem || document;

		// Don't do events on text and comment nodes
		if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
			return;
		}

		// focus/blur morphs to focusin/out; ensure we're not firing them right now
		if ( rfocusMorph.test( type + jQuery.event.triggered ) ) {
			return;
		}

		if ( type.indexOf(".") >= 0 ) {
			// Namespaced trigger; create a regexp to match event type in handle()
			namespaces = type.split(".");
			type = namespaces.shift();
			namespaces.sort();
		}
		ontype = type.indexOf(":") < 0 && "on" + type;

		// Caller can pass in a jQuery.Event object, Object, or just an event type string
		event = event[ jQuery.expando ] ?
			event :
			new jQuery.Event( type, typeof event === "object" && event );

		// Trigger bitmask: & 1 for native handlers; & 2 for jQuery (always true)
		event.isTrigger = onlyHandlers ? 2 : 3;
		event.namespace = namespaces.join(".");
		event.namespace_re = event.namespace ?
			new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" ) :
			null;

		// Clean up the event in case it is being reused
		event.result = undefined;
		if ( !event.target ) {
			event.target = elem;
		}

		// Clone any incoming data and prepend the event, creating the handler arg list
		data = data == null ?
			[ event ] :
			jQuery.makeArray( data, [ event ] );

		// Allow special events to draw outside the lines
		special = jQuery.event.special[ type ] || {};
		if ( !onlyHandlers && special.trigger && special.trigger.apply( elem, data ) === false ) {
			return;
		}

		// Determine event propagation path in advance, per W3C events spec (#9951)
		// Bubble up to document, then to window; watch for a global ownerDocument var (#9724)
		if ( !onlyHandlers && !special.noBubble && !jQuery.isWindow( elem ) ) {

			bubbleType = special.delegateType || type;
			if ( !rfocusMorph.test( bubbleType + type ) ) {
				cur = cur.parentNode;
			}
			for ( ; cur; cur = cur.parentNode ) {
				eventPath.push( cur );
				tmp = cur;
			}

			// Only add window if we got to document (e.g., not plain obj or detached DOM)
			if ( tmp === (elem.ownerDocument || document) ) {
				eventPath.push( tmp.defaultView || tmp.parentWindow || window );
			}
		}

		// Fire handlers on the event path
//for(var i=0;i<arr.length;i++){ arr[i]();//函数执行 }
		i = 0;
		while ( (cur = eventPath[i++]) && !event.isPropagationStopped() ) {

			event.type = i > 1 ?
				bubbleType :
				special.bindType || type;

			// jQuery handler
			handle = ( data_priv.get( cur, "events" ) || {} )[ event.type ] && data_priv.get( cur, "handle" );
			if ( handle ) {
				handle.apply( cur, data );
			}

			// Native handler
			handle = ontype && cur[ ontype ];
			if ( handle && jQuery.acceptData( cur ) && handle.apply && handle.apply( cur, data ) === false ) {
				event.preventDefault();
			}
		}
		event.type = type;

		// If nobody prevented the default action, do it now
		if ( !onlyHandlers && !event.isDefaultPrevented() ) {

			if ( (!special._default || special._default.apply( eventPath.pop(), data ) === false) &&
				jQuery.acceptData( elem ) ) {

				// Call a native DOM method on the target with the same name name as the event.
				// Don't do default actions on window, that's where global variables be (#6170)
				if ( ontype && jQuery.isFunction( elem[ type ] ) && !jQuery.isWindow( elem ) ) {

					// Don't re-trigger an onFOO event when we call its FOO() method
					tmp = elem[ ontype ];

					if ( tmp ) {
						elem[ ontype ] = null;
					}

					// Prevent re-triggering of the same event, since we already bubbled it above
					jQuery.event.triggered = type;
					elem[ type ]();
					jQuery.event.triggered = undefined;

					if ( tmp ) {
						elem[ ontype ] = tmp;
					}
				}
			}
		}

		return event.result;
	},

	/*
	eventHandle = elemData.handle = function( e ) {
		jQuery.event.dispatch.apply( eventHandle.elem, arguments )
	}
	*/
//配发事件的具体操作
	dispatch: function( event ) {//event是原生的event
		//event兼容性处理
		event = jQuery.event.fix( event );
		var i, j, ret, matched, handleObj,
			handlerQueue = [],
			args = core_slice.call( arguments ),
			handlers = ( data_priv.get( this, "events" ) || {} )[ event.type ] || [],
			special = jQuery.event.special[ event.type ] || {};

		// Use the fix-ed jQuery.Event rather than the (read-only) native event
		args[0] = event;
		event.delegateTarget = this;

		// Call the preDispatch hook for the mapped type, and let it bail if desired
		if ( special.preDispatch && special.preDispatch.call( this, event ) === false ) {
			return;
		}

		// 执行顺序的队列，
		handlerQueue = jQuery.event.handlers.call( this, event, handlers );

		// Run delegates first; they may want to stop propagation beneath us
		i = 0;
		while ( (matched = handlerQueue[ i++ ]) && !event.isPropagationStopped() ) {
			event.currentTarget = matched.elem;

			j = 0;
			while ( (handleObj = matched.handlers[ j++ ]) && !event.isImmediatePropagationStopped() ) {

				// Triggered event must either 1) have no namespace, or
				// 2) have namespace(s) a subset or equal to those in the bound event (both can have no namespace).
				if ( !event.namespace_re || event.namespace_re.test( handleObj.namespace ) ) {

					event.handleObj = handleObj;
					event.data = handleObj.data;

					ret = ( (jQuery.event.special[ handleObj.origType ] || {}).handle || handleObj.handler )
							.apply( matched.elem, args );

					if ( ret !== undefined ) {
						if ( (event.result = ret) === false ) {//return false就是阻止冒泡和阻止默认事件
							event.preventDefault();
							event.stopPropagation();
						}
					}
				}
			}
		}

		// Call the postDispatch hook for the mapped type
		if ( special.postDispatch ) {
			special.postDispatch.call( this, event );
		}

		return event.result;
	},

	handlers: function( event, handlers ) {
		var i, matches, sel, handleObj,
			handlerQueue = [],
			delegateCount = handlers.delegateCount,
			cur = event.target;

		// Find delegate handlers
		// Black-hole SVG <use> instance trees (#13180)
		// Avoid non-left-click bubbling in Firefox (#3861)
		if ( delegateCount && cur.nodeType && (!event.button || event.type !== "click") ) {

			for ( ; cur !== this; cur = cur.parentNode || this ) {

				// Don't process clicks on disabled elements (#6911, #8165, #11382, #11764)
				if ( cur.disabled !== true || event.type !== "click" ) {
					matches = [];
					for ( i = 0; i < delegateCount; i++ ) {
						handleObj = handlers[ i ];

						// Don't conflict with Object.prototype properties (#13203)
						sel = handleObj.selector + " ";

						if ( matches[ sel ] === undefined ) {
							matches[ sel ] = handleObj.needsContext ?
								jQuery( sel, this ).index( cur ) >= 0 :
								jQuery.find( sel, this, null, [ cur ] ).length;
						}
						if ( matches[ sel ] ) {
							matches.push( handleObj );
						}
					}
					if ( matches.length ) {
						handlerQueue.push({ elem: cur, handlers: matches });
					}
				}
			}
		}

		// Add the remaining (directly-bound) handlers
		if ( delegateCount < handlers.length ) {
			handlerQueue.push({ elem: this, handlers: handlers.slice( delegateCount ) });
		}

		return handlerQueue;
	},

//JQ中共享原生JS的event属性
	props: "altKey bubbles cancelable ctrlKey currentTarget eventPhase metaKey relatedTarget shiftKey target timeStamp view which".split(" "),

	fixHooks: {},
//键盘的event兼容
	keyHooks: {
		props: "char charCode key keyCode".split(" "),//公有的属性
		filter: function( event, original ) {//兼容性处理
			// 对which做的兼容性处理
			if ( event.which == null ) {//which有没有
			//看charCode有没有，再看keyCode有没有
				event.which = original.charCode != null ? original.charCode : original.keyCode;
			}

			return event;
		}
	},
//鼠标的event兼容
	mouseHooks: {
		props: "button buttons clientX clientY offsetX offsetY pageX pageY screenX screenY toElement".split(" "),
		filter: function( event, original ) {
			var eventDoc, doc, body,
				button = original.button;

			// Calculate pageX/Y if missing and clientX/Y available
			if ( event.pageX == null && original.clientX != null ) {
				eventDoc = event.target.ownerDocument || document;
				doc = eventDoc.documentElement;
				body = eventDoc.body;

				event.pageX = original.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && body.clientLeft || 0 );
				event.pageY = original.clientY + ( doc && doc.scrollTop  || body && body.scrollTop  || 0 ) - ( doc && doc.clientTop  || body && body.clientTop  || 0 );
			}

			// Add which for click: 1 === left; 2 === middle; 3 === right
			// Note: button is not normalized, so don't use it
			if ( !event.which && button !== undefined ) {
				event.which = ( button & 1 ? 1 : ( button & 2 ? 3 : ( button & 4 ? 2 : 0 ) ) );
			}

			return event;
		}
	},
//event对象的兼容处理
	fix: function( event ) {
		if ( event[ jQuery.expando ] ) {//缓存
			return event;
		}

		// Create a writable copy of the event object and normalize some properties
		var i, prop, copy,
			type = event.type,
			originalEvent = event,
			fixHook = this.fixHooks[ type ];//type=click

		if ( !fixHook ) {//兼容事件处理
			this.fixHooks[ type ] = fixHook =
				rmouseEvent.test( type ) ? this.mouseHooks :
				rkeyEvent.test( type ) ? this.keyHooks :
				{};
		}
		copy = fixHook.props ? this.props.concat( fixHook.props ) : this.props;
//创建一个增强版的event,原生没有的event
		event = new jQuery.Event( originalEvent );

		i = copy.length;
		while ( i-- ) {
			prop = copy[ i ];
//原生的button buttons clientX clientY offsetX offsetY pageX 等 赋值给jQuery的event,
			event[ prop ] = originalEvent[ prop ];
		}

		// Support: Cordova 2.5 (WebKit) (#13255)
		// All events should have a target; Cordova deviceready doesn't
		if ( !event.target ) {
			event.target = document;
		}

		// Support: Safari 6.0+, Chrome < 28
		// Target should not be a text node (#504, #13143)
		if ( event.target.nodeType === 3 ) {
			event.target = event.target.parentNode;
		}
//得到兼容之后的event对象
		return fixHook.filter? fixHook.filter( event, originalEvent ) : event;
	},

	special: {
		load: {
			noBubble: true //load事件不冒泡
		},
		focus: {
			// Fire native event if possible so blur/focus sequence is correct
			trigger: function() {//
				if ( this !== safeActiveElement() && this.focus ) {
					this.focus();
					return false;
				}
			},
			//委托给focusin事件
			delegateType: "focusin"
		},
		blur: {
			trigger: function() {
				if ( this === safeActiveElement() && this.blur ) {
					this.blur();
					return false;
				}
			},
			delegateType: "focusout"
		},
		click: {
			// For checkbox, fire native event so checked state will be right
			trigger: function() {
				if ( this.type === "checkbox" && this.click && jQuery.nodeName( this, "input" ) ) {
					this.click();
					return false;
				}
			},

			// For cross-browser consistency, don't fire native .click() on links
			_default: function( event ) {
				return jQuery.nodeName( event.target, "a" );
			}
		},

		beforeunload: {
			postDispatch: function( event ) {

				// Support: Firefox 20+
				// Firefox doesn't alert if the returnValue field is not set.
				if ( event.result !== undefined ) {
					event.originalEvent.returnValue = event.result;
				}
			}
		}
	},

	simulate: function( type, elem, event, bubble ) {
		// Piggyback on a donor event to simulate a different one.
		// Fake originalEvent to avoid donor's stopPropagation, but if the
		// simulated event prevents default then we do the same on the donor.
		var e = jQuery.extend(
			new jQuery.Event(),
			event,
			{
				type: type,
				isSimulated: true,
				originalEvent: {}
			}
		);
		if ( bubble ) {
			jQuery.event.trigger( e, null, elem );
		} else {
			jQuery.event.dispatch.call( elem, e );
		}
		if ( e.isDefaultPrevented() ) {
			event.preventDefault();
		}
	}
};

jQuery.removeEvent = function( elem, type, handle ) {
	if ( elem.removeEventListener ) {
		elem.removeEventListener( type, handle, false );
	}
};
//给Jquery类增加一个静态函数，当成类看时前面是命名空间，
jQuery.Event = function( src, props ) {
	// 不是通过new调用，就new一个，
	if ( !(this instanceof jQuery.Event) ) {
		return new jQuery.Event( src, props );
	}

	// Event object
	if ( src && src.type ) {
		this.originalEvent = src;
		this.type = src.type;

		// Events bubbling up the document may have been marked as prevented
		// by a handler lower down the tree; reflect the correct value.
		this.isDefaultPrevented = ( src.defaultPrevented ||
			src.getPreventDefault && src.getPreventDefault() ) ? returnTrue : returnFalse;

	// Event type
	} else {
		this.type = src;
	}

	// 属性继承
	if ( props ) {
		jQuery.extend( this, props );
	}

	// Create a timestamp if incoming event doesn't have one
	this.timeStamp = src && src.timeStamp || jQuery.now();

	// Mark it as fixed
	this[ jQuery.expando ] = true;
};

// jQuery.Event is based on DOM3 Events as specified by the ECMAScript Language Binding
// http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
jQuery.Event.prototype = {
	isDefaultPrevented: returnFalse,
	isPropagationStopped: returnFalse,
	isImmediatePropagationStopped: returnFalse,

	preventDefault: function() {
		var e = this.originalEvent;

		this.isDefaultPrevented = returnTrue;

		if ( e && e.preventDefault ) {
			e.preventDefault();
		}
	},
	stopPropagation: function() {//阻止冒泡
		var e = this.originalEvent;

		this.isPropagationStopped = returnTrue;

		if ( e && e.stopPropagation ) {
			e.stopPropagation();//原生的阻止冒泡方法
		}
	},
	stopImmediatePropagation: function() {//阻止冒泡
		this.isImmediatePropagationStopped = returnTrue;
		this.stopPropagation();
	}
};

// Create mouseenter/leave events using mouseover/out and event-time checks
// Support: Chrome 15+
jQuery.each({
	mouseenter: "mouseover",
	mouseleave: "mouseout"
}, function( orig, fix ) {
	//挂载到special上
	jQuery.event.special[ orig ] = {
		delegateType: fix,
		bindType: fix,

		handle: function( event ) {
			var ret,
				target = this,
				related = event.relatedTarget,
				handleObj = event.handleObj;

			// For mousenter/leave call the handler if related is outside the target.
			// NB: No relatedTarget if the mouse left/entered the browser window
			if ( !related || (related !== target && !jQuery.contains( target, related )) ) {
				event.type = handleObj.origType;
				ret = handleObj.handler.apply( this, arguments );
				event.type = fix;
			}
			return ret;
		}
	};
});

// Create "bubbling" focus and blur events
// Support: Firefox, Chrome, Safari
if ( !jQuery.support.focusinBubbles ) {
	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {

		// Attach a single capturing handler while someone wants focusin/focusout
		var attaches = 0,
			handler = function( event ) {
				jQuery.event.simulate( fix, event.target, jQuery.event.fix( event ), true );
			};
		//挂载到special上
		jQuery.event.special[ fix ] = {
			setup: function() {
				if ( attaches++ === 0 ) {
					document.addEventListener( orig, handler, true );
				}
			},
			teardown: function() {
				if ( --attaches === 0 ) {
					document.removeEventListener( orig, handler, true );
				}
			}
		};
	});
}

jQuery.fn.extend({

//$('ul').on('click','li',{name:'hello'},function(){});  4个参数
//$('#div1').on('click',{name:'hello'},function(ev){});  3个参数
//$('#div1').on('click','li',function(ev){});  3个参数
//$('#div1').on('click',function(){});  2个参数
	on: function( types, selector, data, fn, one/*INTERNAL内部使用*/ ) {
		var origFn, type;
		/*
			$('#div1').on({
				'click' : function(){
					alert(123);
				},
				'mouseover' : function(){
					alert(456);
				}
			});
		*/
		if ( typeof types === "object" ) {//json
			// ( types-Object, selector, data )
			if ( typeof selector !== "string" ) {
				// ( types-Object, data )
				data = data || selector;
				selector = undefined;
			}
			for ( type in types ) {//分开调用
				this.on( type, selector, data, types[ type ], one );
			}
			return this;
		}

		//行参修正
		if ( data == null && fn == null ) {
			// 2个参数，types=click,selector=function,data=fn=null
			fn = selector;
			data = selector = undefined;
		} else if ( fn == null ) {//3个参数
			if ( typeof selector === "string" ) {
				//types=click,selector='li',data=function,fn=null
				fn = data;
				data = undefined;
			} else {
				//types=click,selector={}, data=function, fn=null
				fn = data;
				data = selector;
				selector = undefined;
			}
		}
		if ( fn === false ) {
			fn = returnFalse;
		} else if ( !fn ) {
			return this;
		}

		//$('#div1').one('click',function(){})   只执行一次
		if ( one === 1 ) {//one方法调进来的
			origFn = fn;//村一次函数
			fn = function( event ) {
				jQuery().off( event );//取消事件
				return origFn.apply( this, arguments );//函数执行一次
			};
			// 给函数加唯一标识
			//a = 0; alert(a || (a=5)); 弹出5，a!=0时弹出a的值
			fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
		}
		return this.each( function() {
			//add( this, click, fn, {name:'hello'}, 'li' )
			jQuery.event.add( this, types, fn, data, selector );
		});
	},
	one: function( types, selector, data, fn ) {
		return this.on( types, selector, data, fn, 1 );//第五个参数是1
	},
	off: function( types, selector, fn ) {//seletor是委托
		var handleObj, type;
		if ( types && types.preventDefault && types.handleObj ) {
			// ( event )  dispatched jQuery.Event
			handleObj = types.handleObj;
			jQuery( types.delegateTarget ).off(
				handleObj.namespace ? handleObj.origType + "." + handleObj.namespace : handleObj.origType,
				handleObj.selector,
				handleObj.handler
			);
			return this;
		}
		if ( typeof types === "object" ) {//json做遍历
			// ( types-object [, selector] )
			for ( type in types ) {
				this.off( type, selector, types[ type ] );
			}
			return this;
		}
		//参数修正
		if ( selector === false || typeof selector === "function" ) {
			// ( types [, fn] )
			fn = selector;
			selector = undefined;
		}
		if ( fn === false ) {
			fn = returnFalse;
		}
		//调用remove
		return this.each(function() {
			jQuery.event.remove( this, types, fn, selector );
		});
	},

	trigger: function( type, data ) {
		return this.each(function() {
			jQuery.event.trigger( type, data, this );
		});
	},
	triggerHandler: function( type, data ) {
		var elem = this[0];
		if ( elem ) {
			return jQuery.event.trigger( type, data, elem, true );
		}
	}
});
var isSimple = /^.[^:#\[\.,]*$/,
	rparentsprev = /^(?:parents|prev(?:Until|All))/,
	rneedsContext = jQuery.expr.match.needsContext,
	// methods guaranteed to produce a unique set when starting from a unique set
	guaranteedUnique = {
		children: true,
		contents: true,
		next: true,
		prev: true
	};

jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblclick " +
	"mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
	"change select submit keydown keypress keyup error contextmenu").split(" "), function( i, name ) {

	// Handle event binding
	jQuery.fn[ name ] = function( data, fn ) {
		return arguments.length > 0 ?
			this.on( name, null, data, fn ) : //on没有selector就没有委托
			this.trigger( name );
	};
});

jQuery.fn.extend({
	hover: function( fnOver, fnOut ) {
		return this.mouseenter( fnOver ).mouseleave( fnOut || fnOver );
	},

	bind: function( types, data, fn ) {//on没有委托
		return this.on( types, null, data, fn );
	},
	unbind: function( types, fn ) {//on没有委托
		return this.off( types, null, fn );
	},
/*
$('ul').delegate('li','click',{name:'hello'},function(){
	$(this).css('background','red');
});
*/
	delegate: function( selector, types, data, fn ) {
		return this.on( types, selector, data, fn );//this=$('ul')，on有selector就是委托
	},
	undelegate: function( selector, types, fn ) {
		// ( namespace ) or ( selector, types [, fn] )
		return arguments.length === 1 ? this.off( selector, "**" ) : this.off( types, selector || "**", fn );
	}
});

}
///////////////////////////事件操作end//////////////////////////////////////////
///////////////////////////////////////DOM操作begin//////////////////////////////
{
jQuery.fn.extend({
//$('ul').find('li').css('background','red');
//$('ul').find( $('li') ).css('background','red');
	find: function( selector ) {
		var i,
			ret = [],
			self = this,
			len = self.length;
		if ( typeof selector !== "string" ) {//$('li')
			//jQuery( selector )是li集合，filter调用者是li，filter返回的是满足function条件的li，li.prevObject=所有li，
		//外层 this.pushStack返回满足条件的li,li.prevObject=所有ul，
			return this.pushStack( jQuery( selector ).filter(function() {
				for ( i = 0; i < len; i++ ) {
					if ( jQuery.contains( self[ i ], this ) ) {//this是每一个li，是包含关系返回true
						return true;
					}
				}
			}) );
		}
		//$('ul').find('li').css('background','red');
		//'li'
		for ( i = 0; i < len; i++ ) {
			jQuery.find( selector, self[ i ], ret );//Sizzle
		}

		// Needed because $( selector, context ) becomes $( context ).find( selector ) , unique去重
		ret = this.pushStack( len > 1 ? jQuery.unique( ret ) : ret );
		ret.selector = this.selector ? this.selector + " " + selector : selector;
		return ret;
	},
	/*
	<div class="box">div1<span class="box">span</span></div>
	<div>div2</div>
	<span class="box1">span1</span>
	<span class="box2">span2</span>
	<span class="box3">span3</span>
	$('div').has('span').css('border','1px red solid');
	*/
	has: function( target ) {//target = "span"
	/*jQuery( target, this ):
	return ( context ：div集合对象 || rootjQuery ).find( selector："span" );Sizzle的find方法
	*/
		var targets = jQuery( target, this ),//this是div集合，返回从div集合对象中找到的span对象<span class="box">span</span>
			l = targets.length;//1

		return this.filter(  function() {//this是div集合
			var i = 0;
			for ( ; i < l; i++ ) {
				if ( jQuery.contains( this, targets[i] ) ) {//this是每一个div
					return true;
				}
			}
		}
/*
filter: function( f ) {  //这里没有函数体
	return this.pushStack( winnow(this, f || [], false) );//返回的是winnow(this, f || [], true)返回的结果并且结果.prevObject = 调用者。this是div集合
},
function winnow( elements, f, not ) {
		//把grep当成主体函数来看
		return jQuery.grep( elements, function( elem, i ) { //elements是div集合
			return !!f.call( elem, i, elem ) !== not;//elem是每一个div
		});//返回的是满足函数条件function也就是f的div集合
}
*/
		);
	},

	not: function( selector ) {
		//$('div').not('.box').css('border','1px red solid');
		/*
		pushStack: function( elems ) {
			var ret = jQuery.merge( this.constructor(), elems );
			ret.prevObject = this;
			return ret;  //返回的是满足条件的'.div',这个'.div'的prevObject=$('div'),用于回退
		}
		*/
		//返回的是winnow(this, selector || [], true)返回的结果并且结果.prevObject = 调用者。
		return this.pushStack( winnow(this, selector || [], true) );
	},

	filter: function( selector ) {
		return this.pushStack( winnow(this, selector || [], false) );
	},

	is: function( selector ) {
		return !!winnow(
			this,

			// If this is a positional/relative selector, check membership in the returned set
			// so $("p:first").is("p:last") won't return true for a doc with two "p".
			typeof selector === "string" && rneedsContext.test( selector ) ?
				jQuery( selector ) :
				selector || [],
			false
		).length;
	},

	//$('#div2').closest('.box')
	//$('#div2').closest('.box', $('body').get(0) )
	closest: function( selectors, context ) {
		var cur,
			i = 0,
			l = this.length,
			matched = [],
			pos = ( rneedsContext.test( selectors ) || typeof selectors !== "string" ) ?
			//获取jqUERY对象
				jQuery( selectors, context || this.context ) :
				0;

		for ( ; i < l; i++ ) {
			for ( cur = this[i]; cur && cur !== context; cur = cur.parentNode ) {
				// Always skip document fragments
				if ( cur.nodeType < 11 && (pos ?
					pos.index(cur) > -1 :

					// Don't pass non-elements to Sizzle
					cur.nodeType === 1 &&
						jQuery.find.matchesSelector(cur, selectors)) ) {

					cur = matched.push( cur );//找到就push进来
					break;//找到一个就跳出循环
				}
			}
		}
//入栈去重
		return this.pushStack( matched.length > 1 ? jQuery.unique( matched ) : matched );
	},

	// Determine the position of an element within
	// the matched set of elements
	index: function( elem ) {

//console.log( $('#div1').index() );//1,这个元素在所有兄弟节点的排名
		if ( !elem ) {
			//this.first() = this.eq(0);
			return ( this[ 0 ] && this[ 0 ].parentNode ) ? this.first().prevAll().length : -1;
		}

//$('#span1').index('span') ;//span1在所有span中的排名
		if ( typeof elem === "string" ) {
			return core_indexOf.call( jQuery( elem ), this[ 0 ] );
		}

		// $('span').index( $('#span1') ) );
		return core_indexOf.call( this,

			// If it receives a jQuery object, the first element is used
			elem.jquery ? elem[ 0 ] : elem
		);
	},

//$('div').add('span').css('border','1px red solid');//div span变红
	add: function( selector, context ) {
		var set = typeof selector === "string" ?
				jQuery( selector, context ) :
				jQuery.makeArray( selector && selector.nodeType ? [ selector ] : selector ),
//this.get()是$('div')数组，set是'span'对象，合并成一个对象，
			all = jQuery.merge( this.get(), set );

		return this.pushStack( jQuery.unique(all) );
	},

//$('div').find('span').css('color','red').addBack('.box').css('border','1px red solid');//addBack回到栈的下一层，并且当前层和下一层进行操作。
	addBack: function( selector ) {
//this是span，this.prevObject是div，
		return this.add( selector == null ?
			this.prevObject : this.prevObject.filter(selector)
		);
	}
});

function sibling( cur, dir ) {
	while ( (cur = cur[dir]) && cur.nodeType !== 1 ) {}

	return cur;
}

//节点的获取
jQuery.each({
	parent: function( elem ) {//elem是每一个调用者div
		var parent = elem.parentNode;
		return parent && parent.nodeType !== 11 ? parent : null;
	},
	parents: function( elem ) {
		return jQuery.dir( elem, "parentNode" );
	},
	parentsUntil: function( elem, i, until ) {
		return jQuery.dir( elem, "parentNode", until );
	},
	next: function( elem ) {
		return sibling( elem, "nextSibling" );
	},
	prev: function( elem ) {
		return sibling( elem, "previousSibling" );
	},
	nextAll: function( elem ) {
		return jQuery.dir( elem, "nextSibling" );
	},
	prevAll: function( elem ) {
		return jQuery.dir( elem, "previousSibling" );
	},
	nextUntil: function( elem, i, until ) {
		return jQuery.dir( elem, "nextSibling", until );
	},
	prevUntil: function( elem, i, until ) {
		return jQuery.dir( elem, "previousSibling", until );
	},
	siblings: function( elem ) {
		return jQuery.sibling( ( elem.parentNode || {} ).firstChild, elem );
	},
	children: function( elem ) {
		return jQuery.sibling( elem.firstChild );
	},
	contents: function( elem ) {//elem每一个div
		return elem.contentDocument || jQuery.merge( [], elem.childNodes );
	}
}, function( name, fn ) {
	//jQuery.fn[ name ]是对jQuery.prototype对象的方法扩展
	/*
	map: function( elems, callback, arg ) {
		if (   callback( elems[ i ], i, arg )   != null ) {
			ret[ ret.length ] =  callback( elems[ i ], i, arg );//末尾追加
		}
		return ret;
	}
	$('div').parentsUntil('body','div'), until, selector是'body','div'，与上面parentsUntil定义的无关，
	$('span').parents('body')
	*/
	jQuery.fn[ name ] = function( until, selector ) {
		var matched = jQuery.map( this, fn, until );//this是div集合，返回fn(this[i],i,until)结果的集合
//具体操作都是在这里，真正实现是fn函数里面
		if ( name.slice( -5 ) !== "Until" ) {
			selector = until;//seletor='body'
		}

		if ( selector && typeof selector === "string" ) {
			matched = jQuery.filter( selector, matched );
		}

		if ( this.length > 1 ) {
			/*
			guaranteedUnique = {
				children: true,
				contents: true,
				next: true,
				prev: true
			};
			*/
			if ( !guaranteedUnique[ name ] ) {//在json里面
				jQuery.unique( matched );//去重
			}

			// Reverse order for parents* and prev-derivatives
			if ( rparentsprev.test( name ) ) {
				matched.reverse();
			}
		}

		return this.pushStack( matched );
	};
});

jQuery.extend({
	// jQuery.filter( '.box1', $('div'),true )   div中class有box1的
	filter: function( expr, elems, not ) {
		var elem = elems[ 0 ];

		if ( not ) {
			expr = ":not(" + expr + ")"; // :not(.box1)
		}

		return elems.length === 1 && elem.nodeType === 1 ?
		//Sizzle完成
			jQuery.find.matchesSelector( elem, expr ) ? [ elem ] : [] :
			jQuery.find.matches( expr, jQuery.grep( elems, function( elem ) {
				return elem.nodeType === 1;
			}));
	},

	dir: function( elem, dir, until ) {
		var matched = [],
			truncate = until !== undefined;

		while ( (elem = elem[ dir ]) && elem.nodeType !== 9 ) {
			if ( elem.nodeType === 1 ) {
				if ( truncate && jQuery( elem ).is( until ) ) {
					break;
				}
				matched.push( elem );
			}
		}
		return matched;
	},

	sibling: function( n, elem ) {
		var matched = [];

		for ( ; n; n = n.nextSibling ) {
			if ( n.nodeType === 1 && n !== elem ) {
				matched.push( n );
			}
		}

		return matched;
	}
});

//winnow($('div'), '.box1' || [], true)  div中class有box1的
function winnow( elements, qualifier, not ) {//返回的是满足函数条件的elements元素集合
	/*
	$('div').filter(function(i,elem){
		return elem.className == 'box';

	}).css('border','1px red solid');
	*/
	if ( jQuery.isFunction( qualifier ) ) {
		//grep是elements每一个元素执行function()，函数传入的实参一个是每一个元素另一个元素下标，这里elem, i是形参， 并判断函数的返回值，函数体这里定义，
		return jQuery.grep( elements, function( elem, i ) {
			//!!是把undefined和null转换成false
			return !!qualifier.call( elem, i, elem ) !== not;
		});//返回的是满足函数条件的elements：div元素集合

	}

	/*
	var oBox = document.getElementsByClassName('box')[0];
	$('div').filter(oBox).css('border','1px red solid');
	*/
	if ( qualifier.nodeType ) {
		return jQuery.grep( elements, function( elem ) {
			return ( elem === qualifier ) !== not;
		});

	}

	if ( typeof qualifier === "string" ) {
		//isSimple = /^.[^:#\[\.,]*$/  任意字符开头，不包括:#[.,一直到结束
		if ( isSimple.test( qualifier ) ) {//匹配成功：.box，#div1，:odd ，ul，li，div
			return jQuery.filter( qualifier, elements, not );
		}
		//匹配不成功div:odd，ul #li，ul[title='hello']，div.box，ul,li
		qualifier = jQuery.filter( qualifier, elements );
	}
		//匹配不成功
	return jQuery.grep( elements, function( elem ) {
		return ( core_indexOf.call( qualifier, elem ) >= 0 ) !== not;
	});
}

var rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi,
	rtagName = /<([\w:]+)/,
	rhtml = /<|&#?\w+;/,
	rnoInnerhtml = /<(?:script|style|link)/i,
	manipulation_rcheckableType = /^(?:checkbox|radio)$/i,
	// checked="checked" or checked
	rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
	rscriptType = /^$|\/(?:java|ecma)script/i,
	rscriptTypeMasked = /^true\/(.*)/,
	rcleanScript = /^\s*<!(?:\[CDATA\[|--)|(?:\]\]|--)>\s*$/g,

	// We have to close these tags to support XHTML (#13200)
	wrapMap = {

		// Support: IE 9
		option: [ 1, "<select multiple='multiple'>", "</select>" ],

		thead: [ 1, "<table>", "</table>" ],
		col: [ 2, "<table><colgroup>", "</colgroup></table>" ],
		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
		td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],

		_default: [ 0, "", "" ]
	};

// Support: IE 9
wrapMap.optgroup = wrapMap.option;

wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
wrapMap.th = wrapMap.td;

jQuery.fn.extend({
//$('div').text('<h1>标题</h1>');//不会被解析成标签
	text: function( value ) {
		return jQuery.access( this, function( value ) {
			return value === undefined ?
				jQuery.text( this ) ://获取
				this.empty().append( ( this[ 0 ] && this[ 0 ].ownerDocument || document ).createTextNode( value ) );
		}, null, value, arguments.length );
	},

	/*
	$('span').append( oDiv );
	$('span').append( $('div') );
	$('span').append( '<div></div>' );
	*/
	append: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
				var target = manipulationTarget( this, elem );
				target.appendChild( elem );
			}
		});
	},

	/*
	$('div').prepend( $('span') );//sopan添加到div里面的最前面
	//<div><span></span>div</div>
	*/
	prepend: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
				//manipulationTarget是做兼容，返回的是this
				var target = manipulationTarget( this, elem );
				target.insertBefore( elem, target.firstChild );//firstChild第一个子节点
			}
		});
	},

	before: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.parentNode ) {
				//添加到this前面
				this.parentNode.insertBefore( elem, this );
			}
		});
	},

	after: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.parentNode ) {
				//添加到下一个兄弟节点前面。就是后面
				this.parentNode.insertBefore( elem, this.nextSibling );
			}
		});
	},

	// $('div').remove('.box');//删除节点
	remove: function( selector, keepData ) {
		var elem,
			elems = selector ? jQuery.filter( selector, this ) : this,
			i = 0;

		for ( ; (elem = elems[i]) != null; i++ ) {
			if ( !keepData && elem.nodeType === 1 ) {
				//gatAll删除子标签
				jQuery.cleanData( getAll( elem ) );//删除节点并且删除点击事件
			}

			if ( elem.parentNode ) {
				//标签中有script标签
				if ( keepData && jQuery.contains( elem.ownerDocument, elem ) ) {
					setGlobalEval( getAll( elem, "script" ) );
				}
				elem.parentNode.removeChild( elem );//删除这个节点，原生方法
			}
		}

		return this;
	},

	empty: function() {
		var elem,
			i = 0;

		for ( ; (elem = this[i]) != null; i++ ) {
			if ( elem.nodeType === 1 ) {

				// 清空data数据缓存和点击事件
				jQuery.cleanData( getAll( elem, false ) );

				// Remove any remaining nodes
				elem.textContent = "";
			}
		}

		return this;
	},

	//var cloneDiv3 = $('div').clone(true,true);//子元素有点击事件
	clone: function( dataAndEvents, deepDataAndEvents ) {
		dataAndEvents = dataAndEvents == null ? false : dataAndEvents;
		deepDataAndEvents = deepDataAndEvents == null ? dataAndEvents : deepDataAndEvents;
/*
（this.） map: function( callback ) {
	return this.pushStack( jQuery.map(
									this,
									function( elem, i ) {
										return callback.call( elem, i, elem );
									}
								)
						   );
	 },
*/
		return this.map( function () {//this的每一个元素，调用f,返回f结果集合，结果.preObject= $('div'), 调用内部clone方法
			return jQuery.clone( this, dataAndEvents, deepDataAndEvents );
		});
	},

	html: function( value ) {
		return jQuery.access( this, function( value ) {
			var elem = this[ 0 ] || {},
				i = 0,
				l = this.length;

			if ( value === undefined && elem.nodeType === 1 ) {
				return elem.innerHTML;//$('span').html();原生获取方式
			}

			//设置$('span').html('<tr></tr>');
			// See if we can take a shortcut and just use innerHTML
			if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
				!wrapMap[ ( rtagName.exec( value ) || [ "", "" ] )[ 1 ].toLowerCase() ] ) {

				value = value.replace( rxhtmlTag, "<$1></$2>" );

				try {
					for ( ; i < l; i++ ) {
						elem = this[ i ] || {};

						// Remove element nodes and prevent memory leaks
						if ( elem.nodeType === 1 ) {
							jQuery.cleanData( getAll( elem, false ) );
							elem.innerHTML = value;
						}
					}

					elem = 0;

				// If using innerHTML throws an exception, use the fallback method
				} catch( e ) {}
			}

			if ( elem ) {
				this.empty().append( value );//append添加节点
			}
		}, null, value, arguments.length );
	},

	replaceWith: function() {
		var
			// Snapshot the DOM in case .domManip sweeps something relevant into its fragment
			args = jQuery.map( this, function( elem ) {
				return [ elem.nextSibling, elem.parentNode ];
			}),
			i = 0;

		// Make the changes, replacing each context element with the new content
		this.domManip( arguments, function( elem ) {
			var next = args[ i++ ],
				parent = args[ i++ ];

			if ( parent ) {
				// Don't use the snapshot next if it has moved (#13810)
				if ( next && next.parentNode !== parent ) {
					next = this.nextSibling;
				}
				jQuery( this ).remove();
				parent.insertBefore( elem, next );
			}
		// Allow new content to include elements from the context set
		}, true );

		// Force removal if there was no new content (e.g., from empty arguments)
		return i ? this : this.remove();
	},

	//$('div').detach();
	detach: function( selector ) {
		return this.remove( selector, true );
	},

	domManip: function( args, callback, allowIntersection ) {

		// Flatten any nested arrays
		args = core_concat.apply( [], args );

		var fragment, first, scripts, hasScripts, node, doc,
			i = 0,
			l = this.length,
			set = this,
			iNoClone = l - 1,
			value = args[ 0 ],
			isFunction = jQuery.isFunction( value );
/*
	$('span').append(function(){
		return 'hello';
	});
*/
		// We can't cloneNode fragments that contain checked, in WebKit
		if ( isFunction || !( l <= 1 || typeof value !== "string" || jQuery.support.checkClone || !rchecked.test( value ) ) ) {
			return this.each(function( index ) {
				var self = set.eq( index );
				if ( isFunction ) {
					args[ 0 ] = value.call( this, index, self.html() );
				}
//重新调用$('span').append('hello')
				self.domManip( args, callback, allowIntersection );
			});
		}

		if ( l ) {
//$('span').append('<h1>hello</h1>'); 文档碎片
			fragment = jQuery.buildFragment( args, this[ 0 ].ownerDocument, false, !allowIntersection && this );
			first = fragment.firstChild;

			if ( fragment.childNodes.length === 1 ) {
				fragment = first;
			}

			if ( first ) {
				scripts = jQuery.map( getAll( fragment, "script" ), disableScript );
				hasScripts = scripts.length;

				// Use the original fragment for the last item instead of the first because it can end up
				// being emptied incorrectly in certain situations (#8070).
				for ( ; i < l; i++ ) {
					node = fragment;

					if ( i !== iNoClone ) {
						node = jQuery.clone( node, true, true );

						// Keep references to cloned scripts for later restoration
						if ( hasScripts ) {
							// Support: QtWebKit
							// jQuery.merge because core_push.apply(_, arraylike) throws
							jQuery.merge( scripts, getAll( node, "script" ) );
						}
					}

					callback.call( this[ i ], node, i );
				}

				if ( hasScripts ) {
					doc = scripts[ scripts.length - 1 ].ownerDocument;

					// Reenable scripts
					jQuery.map( scripts, restoreScript );

					// Evaluate executable scripts on first document insertion
					for ( i = 0; i < hasScripts; i++ ) {
						node = scripts[ i ];
						if ( rscriptType.test( node.type || "" ) &&
							!data_priv.access( node, "globalEval" ) && jQuery.contains( doc, node ) ) {

							if ( node.src ) {
								// Hope ajax is available...
								jQuery._evalUrl( node.src );
							} else {
								jQuery.globalEval( node.textContent.replace( rcleanScript, "" ) );
							}
						}
					}
				}
			}
		}

		return this;
	}
});

jQuery.each({
	appendTo: "append",
	prependTo: "prepend",
	insertBefore: "before",
	insertAfter: "after",
	replaceAll: "replaceWith"
}, function( name, original ) {
	//$('span').appendTo( $('div') ).css('border','1px red solid');
	jQuery.fn[ name ] = function( selector ) {
		var elems,
			ret = [],
			insert = jQuery( selector ),//$('div')
			last = insert.length - 1,
			i = 0;

		for ( ; i <= last; i++ ) {
			elems = i === last ? this : this.clone( true );
			//调用jQuery($('div')[i]).append($('span'))
			jQuery( insert[ i ] )[ original ]( elems );

			// Support: QtWebKit
			// .get() because core_push.apply(_, arraylike) throws
			core_push.apply( ret, elems.get() );
		}

		return this.pushStack( ret );
	};
});

jQuery.extend({
	//jQuery.clone( $('div')每一个, true, true );
	clone: function( elem, dataAndEvents, deepDataAndEvents ) {
		var i, l, srcElements, destElements,
			clone = elem.cloneNode( true ),//原生的方式，克隆，仅仅复制html节点包括子节点，事件缓存没有复制过来
			//当前页
			inPage = jQuery.contains( elem.ownerDocument, elem );
/*
console.log(clone);//节点包括子节点。false就只有外层节点，没有子节点
var dd = getAll( elem );//[div, span, p]
var rr = getAll( clone );//[div, span, p]
*/
/*  Support: IE >= 9   if是兼容性

	$('input').prop('checked',true);
	$('input').clone().appendTo( 'body' );//jQuery克隆过去也是选中的，但是原生的是没有选中的，
*/
		if ( !jQuery.support.noCloneChecked && ( elem.nodeType === 1 || elem.nodeType === 11 ) && !jQuery.isXMLDoc( elem ) ) {

			// We eschew Sizzle here for performance reasons: http://jsperf.com/getall-vs-sizzle/2
			destElements = getAll( clone );//数组
			srcElements = getAll( elem );

			for ( i = 0, l = srcElements.length; i < l; i++ ) {
				fixInput( srcElements[ i ], destElements[ i ] );
			}
		}

		// Copy the events from the original to the clone
		if ( dataAndEvents ) {//克隆自身的事件
			if ( deepDataAndEvents ) {//克隆子项的事件
				srcElements = srcElements || getAll( elem );
				destElements = destElements || getAll( clone );

				for ( i = 0, l = srcElements.length; i < l; i++ ) {
					cloneCopyEvent( srcElements[ i ], destElements[ i ] );
				}
			} else {//不克隆子项只克隆自身，原节点、复制的节点
				cloneCopyEvent( elem, clone );
			}
		}

		// 克隆的元素包含script标签
		destElements = getAll( clone, "script" );
		if ( destElements.length > 0 ) {
			//把script标签设置为全局script执行
			setGlobalEval( destElements, !inPage && getAll( elem, "script" ) );
		}

		// Return the cloned set
		return clone;
	},

	//创建文档碎片
	buildFragment: function( elems, context, scripts, selection ) {
		var elem, tmp, tag, wrap, contains, j,
			i = 0,
			l = elems.length,
			fragment = context.createDocumentFragment(),
			nodes = [];//实现的结果

		for ( ; i < l; i++ ) {
			elem = elems[ i ];//每一个元素做处理

			if ( elem || elem === 0 ) {

				// Add nodes directly
				if ( jQuery.type( elem ) === "object" ) {
					// Support: QtWebKit
					// jQuery.merge because core_push.apply(_, arraylike) throws
					jQuery.merge( nodes, elem.nodeType ? [ elem ] : elem );

				// Convert non-html into a text node
				} else if ( !rhtml.test( elem ) ) {
					nodes.push( context.createTextNode( elem ) );

//$('span').append( '<h1>hello</h1><h1>hello</h1><h1>hello</h1>' ); 添加多标签用到文档碎片，效率高，
				} else {
					tmp = tmp || fragment.appendChild( context.createElement("div") );

					// Deserialize a standard representation
					tag = ( rtagName.exec( elem ) || ["", ""] )[ 1 ].toLowerCase();
					wrap = wrapMap[ tag ] || wrapMap._default;
					tmp.innerHTML = wrap[ 1 ] + elem.replace( rxhtmlTag, "<$1></$2>" ) + wrap[ 2 ];
/*
	wrapMap = {

		// Support: IE 9
		option: [ 1, "<select multiple='multiple'>", "</select>" ],

		thead: [ 1, "<table>", "</table>" ],
		col: [ 2, "<table><colgroup>", "</colgroup></table>" ],
		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
		td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],

		_default: [ 0, "", "" ]
	};
*/
					j = wrap[ 0 ];
					while ( j-- ) {
						tmp = tmp.lastChild;
					}

					// Support: QtWebKit
					// jQuery.merge because core_push.apply(_, arraylike) throws
					jQuery.merge( nodes, tmp.childNodes );

					// Remember the top-level container
					tmp = fragment.firstChild;

					// Fixes #12346
					// Support: Webkit, IE
					tmp.textContent = "";
				}
			}
		}

		// Remove wrapper from fragment
		fragment.textContent = "";

		i = 0;
		while ( (elem = nodes[ i++ ]) ) {

			// #4087 - If origin and destination elements are the same, and this is
			// that element, do not do anything
			if ( selection && jQuery.inArray( elem, selection ) !== -1 ) {
				continue;
			}

			contains = jQuery.contains( elem.ownerDocument, elem );

			// Append to fragment
			tmp = getAll( fragment.appendChild( elem ), "script" );

			// Preserve script evaluation history
			if ( contains ) {
				setGlobalEval( tmp );
			}

			// Capture executables
			if ( scripts ) {
				j = 0;
				while ( (elem = tmp[ j++ ]) ) {
					if ( rscriptType.test( elem.type || "" ) ) {
						scripts.push( elem );
					}
				}
			}
		}

		return fragment;
	},

	//清除元素的点击事件和数据（data保存的）
	cleanData: function( elems ) {
		var data, elem, events, type, key, j,
			special = jQuery.event.special,
			i = 0;

		for ( ; (elem = elems[ i ]) !== undefined; i++ ) {
			if ( Data.accepts( elem ) ) {
				key = elem[ data_priv.expando ];
//删除元素的点击事件，data里的事件
				if ( key && (data = data_priv.cache[ key ]) ) {
					events = Object.keys( data.events || {} );
					if ( events.length ) {
						for ( j = 0; (type = events[j]) !== undefined; j++ ) {
							if ( special[ type ] ) {//特殊事件，自定义事件
								jQuery.event.remove( elem, type );

							// This is a shortcut to avoid jQuery.event.remove's overhead
							} else {
								jQuery.removeEvent( elem, type, data.handle );
							}
						}
					}
					if ( data_priv.cache[ key ] ) {//删除缓存data里的
						// Discard any remaining `private` data
						delete data_priv.cache[ key ];
					}
				}
			}
			// Discard any remaining `user` data
			delete data_user.cache[ elem[ data_user.expando ] ];
		}
	},

	_evalUrl: function( url ) {
		return jQuery.ajax({
			url: url,
			type: "GET",
			dataType: "script",
			async: false,
			global: false,
			"throws": true
		});
	}
});

// Support: 1.x compatibility
// Manipulating tables requires a tbody
function manipulationTarget( elem, content ) {
	return jQuery.nodeName( elem, "table" ) &&
		jQuery.nodeName( content.nodeType === 1 ? content : content.firstChild, "tr" ) ?
//没有tbody自动添加tbody
		elem.getElementsByTagName("tbody")[0] ||
			elem.appendChild( elem.ownerDocument.createElement("tbody") ) :
		elem;
}

// Replace/restore the type attribute of script elements for safe DOM manipulation
function disableScript( elem ) {
	elem.type = (elem.getAttribute("type") !== null) + "/" + elem.type;
	return elem;
}
function restoreScript( elem ) {
	var match = rscriptTypeMasked.exec( elem.type );

	if ( match ) {
		elem.type = match[ 1 ];
	} else {
		elem.removeAttribute("type");
	}

	return elem;
}

// Mark scripts as having already been evaluated
function setGlobalEval( elems, refElements ) {
	var l = elems.length,
		i = 0;

	for ( ; i < l; i++ ) {
		data_priv.set(
			elems[ i ], "globalEval", !refElements || data_priv.get( refElements[ i ], "globalEval" )
		);
	}
}

//cloneCopyEvent( elem, clone );  克隆事件，原节点目的节点，节点已经由原生方法克隆了，
function cloneCopyEvent( src, dest ) {
	var i, l, type, pdataOld, pdataCur, udataOld, udataCur, events;

	if ( dest.nodeType !== 1 ) {
		return;
	}

	// 1. 从data中克隆事件
	if ( data_priv.hasData( src ) ) {
		pdataOld = data_priv.access( src );
		pdataCur = data_priv.set( dest, pdataOld );
		events = pdataOld.events;

		if ( events ) {
			delete pdataCur.handle;
			pdataCur.events = {};
//遍历
			for ( type in events ) {
				for ( i = 0, l = events[ type ].length; i < l; i++ ) {
					jQuery.event.add( dest, type, events[ type ][ i ] );
				}
			}
		}
	}

	// 2. 从data中克隆数据
	if ( data_user.hasData( src ) ) {
		udataOld = data_user.access( src );
		udataCur = jQuery.extend( {}, udataOld );
//遍历
		data_user.set( dest, udataCur );
	}
}

function getAll( context, tag ) {
	var ret = context.getElementsByTagName ? context.getElementsByTagName( tag || "*" ) :
			context.querySelectorAll ? context.querySelectorAll( tag || "*" ) :
			[];

	return tag === undefined || tag && jQuery.nodeName( context, tag ) ?
		jQuery.merge( [ context ], ret ) :
		ret;
}

// Support: IE >= 9
function fixInput( src, dest ) {
	var nodeName = dest.nodeName.toLowerCase();

	// Fails to persist the checked state of a cloned checkbox or radio button.
	if ( nodeName === "input" && manipulation_rcheckableType.test( src.type ) ) {
		dest.checked = src.checked;

	// Fails to return the selected option to the default selected state when cloning options
	} else if ( nodeName === "input" || nodeName === "textarea" ) {
		dest.defaultValue = src.defaultValue;
	}
}
jQuery.fn.extend({
	/*
	$('span').wrap('<div>');//每个span包一个div	$('span').wrapAll('<div>');//所有span只包一个div，如果span里面有其他标签会把这个标签移出来
	$('span').wrapInner('<div>');//每个span里面包一个div
	$('span').unwrap();//删除父级
	*/
	wrapAll: function( html ) {
		var wrap;

		if ( jQuery.isFunction( html ) ) {
			/*
				$('span').wrapAll(function(){
					return '<div>';
				});
			*/
			return this.each(function( i ) {//函数执行一次，然后用函数返回值再调用
				jQuery( this ).wrapAll( html.call(this, i) );
			});
		}

		if ( this[ 0 ] ) {

			// $('span').wrapAll('<div>'); 创建div对象并且克隆节点，事件也克隆
			wrap = jQuery( html, this[ 0 ].ownerDocument ).eq( 0 ).clone( true );

			if ( this[ 0 ].parentNode ) {
				wrap.insertBefore( this[ 0 ] );//添加到第一个span的前面
			}

			wrap.map(function() {
				var elem = this;

				while ( elem.firstElementChild ) {
					elem = elem.firstElementChild;
				}

				return elem;
			}).append( this );
		}

		return this;
	},

	wrapInner: function( html ) {
		if ( jQuery.isFunction( html ) ) {
			return this.each(function( i ) {
				jQuery( this ).wrapInner( html.call(this, i) );
			});
		}

		return this.each(function() {
			var self = jQuery( this ),
				contents = self.contents();

			if ( contents.length ) {
				contents.wrapAll( html );

			} else {
				self.append( html );
			}
		});
	},
//分别包装
	wrap: function( html ) {
		var isFunction = jQuery.isFunction( html );

		return this.each(function( i ) {
			jQuery( this ).wrapAll( isFunction ? html.call(this, i) : html );
		});
	},
//找到父级，替换操作，删除父级，不能是body
	unwrap: function() {
		return this.parent().each(function() {
			if ( !jQuery.nodeName( this, "body" ) ) {
				jQuery( this ).replaceWith( this.childNodes );
			}
		}).end();
	}
});

}

////////////////////////////////////////////DOM操作end///////////////////////////

////////////////////////////////////css操作开始////////////////////////////////
{
var curCSS, iframe,
	// swappable if display is none or starts with table except "table", "table-cell", or "table-caption"
	// see here for display values: https://developer.mozilla.org/en-US/docs/CSS/display
	rdisplayswap = /^(none|table(?!-c[ea]).+)/,
	rmargin = /^margin/,
	rnumsplit = new RegExp( "^(" + core_pnum + ")(.*)$", "i" ),
	rnumnonpx = new RegExp( "^(" + core_pnum + ")(?!px)[a-z%]+$", "i" ),
	rrelNum = new RegExp( "^([+-])=(" + core_pnum + ")", "i" ),
	elemdisplay = { BODY: "block" },

	cssShow = { position: "absolute", visibility: "hidden", display: "block" },
	cssNormalTransform = {
		letterSpacing: 0,
		fontWeight: 400
	},

	cssExpand = [ "Top", "Right", "Bottom", "Left" ],
	cssPrefixes = [ "Webkit", "O", "Moz", "ms" ];

// return a css property mapped to a potentially vendor prefixed property
function vendorPropName( style, name ) {

	// shortcut for names that are not vendor prefixed
	if ( name in style ) {
		return name;
	}

	// check for vendor prefixed names
	var capName = name.charAt(0).toUpperCase() + name.slice(1),
		origName = name,
		i = cssPrefixes.length;

	while ( i-- ) {
		name = cssPrefixes[ i ] + capName;
		if ( name in style ) {
			return name;
		}
	}

	return origName;
}

function isHidden( elem, el ) {
	// isHidden might be called from jQuery#filter function;
	// in that case, element will be second argument
	elem = el || elem;
	return jQuery.css( elem, "display" ) === "none" || !jQuery.contains( elem.ownerDocument, elem );//动态创建的元素也是不包含也是隐藏
}

// NOTE: we've included the "window" in window.getComputedStyle
// because jsdom on node.js will break without it.
function getStyles( elem ) {
	return window.getComputedStyle( elem, null );//封装
}

function showHide( elements, show ) {
	var display, elem, hidden,
		values = [],
		index = 0,
		length = elements.length;

	for ( ; index < length; index++ ) {
		elem = elements[ index ];
		if ( !elem.style ) {
			continue;
		}

		values[ index ] = data_priv.get( elem, "olddisplay" );
		display = elem.style.display;
		if ( show ) {
			// Reset the inline display of this element to learn if it is
			// being hidden by cascaded rules or not
			if ( !values[ index ] && display === "none" ) {
				elem.style.display = "";
			}

			// Set elements which have been overridden with display: none
			// in a stylesheet to whatever the default browser style is
			// for such an element
			if ( elem.style.display === "" && isHidden( elem ) ) {
				values[ index ] = data_priv.access( elem, "olddisplay", css_defaultDisplay(elem.nodeName) );
			}
		} else {

			if ( !values[ index ] ) {
				hidden = isHidden( elem );

				if ( display && display !== "none" || !hidden ) {
					//获取元素原来的显示样式，块级元素是block行内元素是inline
					data_priv.set( elem, "olddisplay", hidden ? display : jQuery.css(elem, "display") );
				}
			}
		}
	}

	//每一个元素遍历
	for ( index = 0; index < length; index++ ) {
		elem = elements[ index ];
		if ( !elem.style ) {//有sytle属性通过style属性隐藏显示，没有就跳出。
			continue;
		}
		if ( !show || elem.style.display === "none" || elem.style.display === "" ) {
			//values[ index ] || ""，values[ index ]不存在时给空就是false,不直接写 = show ?  'block' ：'none'，因为是行内元素就不能是block而是in-line,
//元素一上来是隐藏状态是获取不到元素的display属性是块级还是行内，调用show的时候通过elem.nodeName动态创建，获取元素是块级还是行内。
			elem.style.display = show ? values[ index ] || "" : "none";
		}
	}

	return elements;
}

jQuery.fn.extend({
	//$('#div1').css('color','yellow');
	css: function( name, value ) {
		return jQuery.access( this, function( elem, name, value ) {
			var styles, len,
				map = {},
				i = 0;
//$('#div1').css( ['color','backgroundColor','width'] )
			if ( jQuery.isArray( name ) ) {//数组获取
				styles = getStyles( elem );
				len = name.length;

				for ( ; i < len; i++ ) {
					//调用jQuery.css()方法来获取
//jQuery.css方法多个值获取传了4个参数，第三个参数是false相当于没传，只是占位隔开第四个参数，
					map[ name[ i ] ] = jQuery.css( elem, name[ i ], false, styles );
				}

				return map;
			}

			return value !== undefined ?
				jQuery.style( elem, name, value ) ://设置:$('#div1').css('color','yellow')
				jQuery.css( elem, name );//获取:$('#div1').css('color')，单个值获取只传了2个参数，后面2个参数没传相当于是false,
		}, name, value, arguments.length > 1 );
	},
	show: function() {
		return showHide( this, true );
	},
	hide: function() {
		return showHide( this );//没传就是false
	},
	toggle: function( state ) {
		if ( typeof state === "boolean" ) {
			return state ? this.show() : this.hide();
		}

		return this.each(function() {
			if ( isHidden( this ) ) {//jQuery对象里面每一个元素是js节点对象
				jQuery( this ).show();
			} else {
				jQuery( this ).hide();
			}
		});
	}
});

jQuery.extend({
	// Add in style property hooks for overriding the default
	// behavior of getting and setting a style property
	cssHooks: {
		opacity: {//透明度处理
			get: function( elem, computed ) {
				if ( computed ) {
					// We should always get a number back from opacity
					var ret = curCSS( elem, "opacity" );
					return ret === "" ? "1" : ret;
				}
			}
		}
	},

	// Don't automatically add "px" to these possibly-unitless properties
	cssNumber: {
		"columnCount": true,
		"fillOpacity": true,
		"fontWeight": true,
		"lineHeight": true,
		"opacity": true,
		"order": true,
		"orphans": true,
		"widows": true,
		"zIndex": true,
		"zoom": true
	},

	// Add in properties whose names you wish to fix before
	// setting or getting the value
	cssProps: {
		// normalize float css property
		"float": "cssFloat"
	},

//设置:jQuery.style( $('#div1')[i], 'float','left' )
	style: function( elem, name, value, extra ) {
		//元素节点的节点类型是3或者8，
		if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
			return;
		}
		// Make sure that we're working with the right name
		var ret, type, hooks,
			origName = jQuery.camelCase( name ),//转驼峰,background-color --> backgroundColor
			style = elem.style;//元素的所有style
//有就返回，没有就加入cssProps这个json,全部保存在$这个对象中。将float转成cssfloat，
		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( style, origName ) );
		// gets hook for the prefixed version
		// followed by the unprefixed version
		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];
		// Check if we're setting a value
		if ( value !== undefined ) {//设置
			type = typeof value;
			// convert relative number strings (+= or -=) to relative numbers. #7345
			//$('#div1').css('width','+=100');
			if ( type === "string" && (ret = rrelNum.exec( value )) ) {
				value = ( ret[1] + 1 ) * ret[2] + parseFloat( jQuery.css( elem, name ) );
				// Fixes bug #9237
				type = "number";
			}
			// value是空或者无限大，设置时候就返回，
			if ( value == null || type === "number" && isNaN( value ) ) {
				return;
			}
			// origName不在jQuery.cssNumber中，在jQuery.cssNumber中不需要加单位。
			if ( type === "number" && !jQuery.cssNumber[ origName ] ) {
				value += "px";//加单位
			}

			// Fixes #8908, it can be done more correctly by specifying setters in cssHooks,
			// but it would mean to define eight (for every problematic property) identical functions
			if ( !jQuery.support.clearCloneStyle && value === "" && name.indexOf("background") === 0 ) {
				style[ name ] = "inherit";
			}

			// If a hook was provided, use that value, otherwise just set the specified value
			if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value, extra )) !== undefined ) {
				style[ name ] = value;//没有兼容性，通过style.name = value设置
			}

		} else {//获取
			// If a hook was provided get the non-computed value from there
			if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
				return ret;
			}

			// 没有兼容性，通过style.name获取
			return style[ name ];
		}
	},

//获取:jQuery.css( $('#div1')[i], 'color' );
	css: function( elem, name, extra, styles ) {
		var val, num, hooks,
//$('#div1').css('background-color'); odiv.style.background-color是不行的，转驼峰成backgroundColor
			origName = jQuery.camelCase( name );//转驼峰，

		/*
		cssProps: {
			"float": "cssFloat"    //class  js中通过 className代表
		},
		*/
//有就返回，没有就加入cssProps这个json,全部保存在$这个对象中。
		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( elem.style, origName ) );
		// gets hook for the prefixed version
		// followed by the unprefixed version
		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];

		// 获取值的兼容性处理
		if ( hooks && "get" in hooks ) {
			val = hooks.get( elem, true, extra );
		}

		// 不做兼容性处理调用curCSS方法获取
		if ( val === undefined ) {
			val = curCSS( elem, name, styles );
		}

		/*
		cssNormalTransform = {
			letterSpacing: 0,
			fontWeight: 400
		},
		返回的值是normal，并且属性名是letterSpacing、fontWeight就返回0、40
		*/
		if ( val === "normal" && name in cssNormalTransform ) {
			val = cssNormalTransform[ name ];
		}

		// 额外参数做判断
		if ( extra === "" || extra ) {
			num = parseFloat( val );//123px转换成123
			return extra === true || jQuery.isNumeric( num ) ? num || 0 : val;
		}
		return val;
	}
});

//curCSS( $('#div1')[i], 'color')
curCSS = function( elem, name, _computed ) {
	var width, minWidth, maxWidth,
		computed = _computed || getStyles( elem ),//getStyles调用原生window.getComputedStyle( elem, null );提高性能

		// Support: IE9
		// getPropertyValue is only needed for .css('filter') in IE9, see #12537
		ret = computed ? computed.getPropertyValue( name ) || computed[ name ] : undefined,
		style = elem.style;

	if ( computed ) {
//ownerDocument获取元素所在页面的document，动态创建一个元素var $span = $('<span>') 就不包含，调用jQuery.style方法来获取，
		if ( ret === "" && !jQuery.contains( elem.ownerDocument, elem ) ) {
			ret = jQuery.style( elem, name );
		}

		// Support: Safari 5.1
		// A tribute to the "awesome hack by Dean Edwards"
		// Safari 5.1.7 (at least) returns percentage for a larger set of values, but width seems to be reliably pixels
		// this is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values
		if ( rnumnonpx.test( ret ) && rmargin.test( name ) ) {

			// Remember the original values
			width = style.width;
			minWidth = style.minWidth;
			maxWidth = style.maxWidth;

			// Put in the new values to get a computed value out
			style.minWidth = style.maxWidth = style.width = ret;
			ret = computed.width;

			// Revert the changed values
			style.width = width;
			style.minWidth = minWidth;
			style.maxWidth = maxWidth;
		}
	}

	return ret;
};

function setPositiveNumber( elem, value, subtract ) {
	var matches = rnumsplit.exec( value );
	return matches ?
		// Guard against undefined "subtract", e.g., when used as in cssHooks
		Math.max( 0, matches[ 1 ] - ( subtract || 0 ) ) + ( matches[ 2 ] || "px" ) :
		value;
}

function augmentWidthOrHeight( elem, name, extra, isBorderBox, styles ) {
	var i = extra === ( isBorderBox ? "border" : "content" ) ?
		// If we already have the right measurement, avoid augmentation
		4 :
		// Otherwise initialize for horizontal or vertical properties
		name === "width" ? 1 : 0,

		val = 0;

	for ( ; i < 4; i += 2 ) {
		// both box models exclude margin, so add it if we want it
		if ( extra === "margin" ) {
			val += jQuery.css( elem, extra + cssExpand[ i ], true, styles );
		}

		if ( isBorderBox ) {
			// border-box includes padding, so remove it if we want content
			if ( extra === "content" ) {
				val -= jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );
			}

			// at this point, extra isn't border nor margin, so remove border
			if ( extra !== "margin" ) {
				val -= jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
			}
		} else {
			// at this point, extra isn't content, so add padding
			val += jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );

			// at this point, extra isn't content nor padding, so add border
			if ( extra !== "padding" ) {
				val += jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
			}
		}
	}

	return val;
}

function getWidthOrHeight( elem, name, extra ) {

	// Start with offset property, which is equivalent to the border-box value
	var valueIsBorderBox = true,
		val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
		styles = getStyles( elem ),
		isBorderBox = jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box";

	// some non-html elements return undefined for offsetWidth, so check for null/undefined
	// svg - https://bugzilla.mozilla.org/show_bug.cgi?id=649285
	// MathML - https://bugzilla.mozilla.org/show_bug.cgi?id=491668
	if ( val <= 0 || val == null ) {
		// Fall back to computed then uncomputed css if necessary
		val = curCSS( elem, name, styles );
		if ( val < 0 || val == null ) {
			val = elem.style[ name ];
		}

		// Computed unit is not pixels. Stop here and return.
		if ( rnumnonpx.test(val) ) {
			return val;
		}

		// we need the check for style in case a browser which returns unreliable values
		// for getComputedStyle silently falls back to the reliable elem.style
		valueIsBorderBox = isBorderBox && ( jQuery.support.boxSizingReliable || val === elem.style[ name ] );

		// Normalize "", auto, and prepare for extra
		val = parseFloat( val ) || 0;
	}

	// use the active box-sizing model to add/subtract irrelevant styles
	return ( val +
		augmentWidthOrHeight(
			elem,
			name,
			extra || ( isBorderBox ? "border" : "content" ),
			valueIsBorderBox,
			styles
		)
	) + "px";
}

//元素一上来是隐藏状态是获取不到元素的display属性是块级还是行内，调用show的时候通过elem.nodeName动态创建，获取元素是块级还是行内。
//css_defaultDisplay(elem.nodeName)  elem.nodeName=div或者span
function css_defaultDisplay( nodeName ) {
	var doc = document,
	/*
	elemdisplay = { BODY: "block" },
	*/
		display = elemdisplay[ nodeName ];

	if ( !display ) {//元素是body就是block,不是body就动态创建然后获取display属性，因为body不能动态创建
		display = actualDisplay( nodeName, doc );//动态创建

		// iframe情况
		if ( display === "none" || !display ) {
			//动态创建iframe
			iframe = ( iframe ||
				jQuery("<iframe frameborder='0' width='0' height='0'/>")
				.css( "cssText", "display:block !important" )
			).appendTo( doc.documentElement );

			// Always write a new HTML skeleton so Webkit and Firefox don't choke on reuse
			doc = ( iframe[0].contentWindow || iframe[0].contentDocument ).document;
			doc.write("<!doctype html><html><body>");
			doc.close();
			//获取iframe里面的节点的display属性
			display = actualDisplay( nodeName, doc );
			iframe.detach();
		}

		// Store the correct default display
		elemdisplay[ nodeName ] = display;
	}

	return display;
}

// 动态创建元素actualDisplay( span, document )
function actualDisplay( name, doc ) {
	var elem = jQuery( doc.createElement( name ) ).appendTo( doc.body ),//创建添加到body中，动态创建元素肯定是显示的，
		display = jQuery.css( elem[0], "display" );//获取display值
	elem.remove();
	return display;
}

jQuery.each([ "height", "width" ], function( i, name ) {
	jQuery.cssHooks[ name ] = {
		get: function( elem, computed, extra ) {
			if ( computed ) {
				// certain elements can have dimension info if we invisibly show them
				// however, it must have a current display style that would benefit from this
				return elem.offsetWidth === 0 && rdisplayswap.test( jQuery.css( elem, "display" ) ) ?
					jQuery.swap( elem, cssShow, function() {
						return getWidthOrHeight( elem, name, extra );
					}) :
					getWidthOrHeight( elem, name, extra );
			}
		},

		set: function( elem, value, extra ) {
			var styles = extra && getStyles( elem );
			return setPositiveNumber( elem, value, extra ?
				augmentWidthOrHeight(
					elem,
					name,
					extra,
					jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
					styles
				) : 0
			);
		}
	};
});

// These hooks cannot be added until DOM ready because the support test
// for it is not run until after DOM ready
jQuery(function() {
	// Support: Android 2.3
	if ( !jQuery.support.reliableMarginRight ) {
		jQuery.cssHooks.marginRight = {
			get: function( elem, computed ) {
				if ( computed ) {
					// Support: Android 2.3
					// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
					// Work around by temporarily setting element display to inline-block
					return jQuery.swap( elem, { "display": "inline-block" },
						curCSS, [ elem, "marginRight" ] );
				}
			}
		};
	}

	// Webkit bug: https://bugs.webkit.org/show_bug.cgi?id=29084
	// getComputedStyle returns percent when specified for top/left/bottom/right
	// rather than make the css module depend on the offset module, we just check for it here
	if ( !jQuery.support.pixelPosition && jQuery.fn.position ) {
		jQuery.each( [ "top", "left" ], function( i, prop ) {
			jQuery.cssHooks[ prop ] = {
				get: function( elem, computed ) {
					if ( computed ) {
						computed = curCSS( elem, prop );
						// if curCSS returns percentage, fallback to offset
						return rnumnonpx.test( computed ) ?
							jQuery( elem ).position()[ prop ] + "px" :
							computed;
					}
				}
			};
		});
	}

});

if ( jQuery.expr && jQuery.expr.filters ) {
	jQuery.expr.filters.hidden = function( elem ) {
		// Support: Opera <= 12.12
		// Opera reports offsetWidths and offsetHeights less than zero on some elements
		return elem.offsetWidth <= 0 && elem.offsetHeight <= 0;
	};

	jQuery.expr.filters.visible = function( elem ) {
		return !jQuery.expr.filters.hidden( elem );
	};
}

// These hooks are used by animate to expand properties
jQuery.each({
	margin: "",
	padding: "",
	border: "Width"
}, function( prefix, suffix ) {
	jQuery.cssHooks[ prefix + suffix ] = {
		expand: function( value ) {
			var i = 0,
				expanded = {},

				// assumes a single number if not a string
				parts = typeof value === "string" ? value.split(" ") : [ value ];

			for ( ; i < 4; i++ ) {
				expanded[ prefix + cssExpand[ i ] + suffix ] =
					parts[ i ] || parts[ i - 2 ] || parts[ 0 ];
			}

			return expanded;
		}
	};

	if ( !rmargin.test( prefix ) ) {
		jQuery.cssHooks[ prefix + suffix ].set = setPositiveNumber;
	}
});
}

//////////////////////////css操作结束////////////////////////////////////////////////////////////////////
//////////////////////////ajax开始////////////////////////////////////////////////////////////////////
{
var r20 = /%20/g,			//全部空格
	rbracket = /\[\]$/, 	//结尾位置匹配中括号
	rCRLF = /\r?\n/g,
	rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i,
	rsubmittable = /^(?:input|select|textarea|keygen)/i;

jQuery.fn.extend({
	serialize: function() {
		return jQuery.param( this.serializeArray() );
	},
	//	console.log($('#form1').serializeArray());//[{'name':'a','value':'1'},{'name':'b','value':'2'}]
	serializeArray: function() {
		return this.map(function(){//map是数组都执行函数，返回结果集合
			//只有表单有elements属性。
			var elements = jQuery.prop( this, "elements" );
			return elements ? jQuery.makeArray( elements ) : this;
		})
		.filter(function(){
			var type = this.type;
			// Use .is(":disabled") so that fieldset[disabled] works
			return this.name && !jQuery( this ).is( ":disabled" ) &&
				rsubmittable.test( this.nodeName ) && !rsubmitterTypes.test( type ) &&
				( this.checked || !manipulation_rcheckableType.test( type ) );
		})
		.map(function( i, elem ){
			var val = jQuery( this ).val();

			return val == null ?
				null :
				jQuery.isArray( val ) ?
					jQuery.map( val, function( val ){
						return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
					}) :
					{ name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
		}).get();
	}
});

//json对象、数组对象序列化成字符串
//$.param( [ {'name':1,'value':2} ] );//1=2,name为key,value为value
jQuery.param = function( a, traditional ) {
	var prefix,
		s = [],
		//定义一个函数
		add = function( key, value ) {
			//是函数就让函数执行，得到返回值
			value = jQuery.isFunction( value ) ? value() : ( value == null ? "" : value );
			//编码
			s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
		};

	// Set traditional to true for jQuery <= 1.3.2 behavior.
	if ( traditional === undefined ) {
		traditional = jQuery.ajaxSettings && jQuery.ajaxSettings.traditional;
	}

	/*
	var $a = $(  [ {'name':1,'value':2},{'name':3,'value':4} ] )};
	console.log( $.param($a) )
	*/
	if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
		// Serialize the form elements
		jQuery.each( a, function() {
			add( this.name, this.value );//每一个a的name和value属性，
		});

	} else {
		// a={'name':[1,3],'value':2}，a={'name':{'a1':1,'a3':3},'value':2}   add是回调进行拼接
		for ( prefix in a ) {
			buildParams( prefix, a[ prefix ], traditional, add );
		}
	}

	// 通过&链接，
	return s.join( "&" ).replace( r20, "+" );
};

//buildParams（name，[1,3]，traditional,add()）
////buildParams（name，{'a1':1,'a3':3}，traditional,add()）
function buildParams( prefix, obj, traditional, add ) {
	var name;

	if ( jQuery.isArray( obj ) ) {
		jQuery.each( obj, function( i, v ) {
			if ( traditional || rbracket.test( prefix ) ) {//传统方式
				add( prefix, v );

			} else {
				// 多用三目运算符
				buildParams( prefix + "[" + ( typeof v === "object" ? i : "" ) + "]", v, traditional, add );
			}
		});

	} else if ( !traditional && jQuery.type( obj ) === "object" ) {
		// Serialize object item.
		for ( name in obj ) {
			buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
		}

	} else {
		// 不是数组不是对象，普通方式
		add( prefix, obj );
	}
}

var
	// Document location
	ajaxLocParts,
	ajaxLocation,

	ajax_nonce = jQuery.now(),

	ajax_rquery = /\?/,
	rhash = /#.*$/,
	rts = /([?&])_=[^&]*/,
	rheaders = /^(.*?):[ \t]*([^\r\n]*)$/mg,
	// #7653, #8125, #8152: local protocol detection
	rlocalProtocol = /^(?:about|app|app-storage|.+-extension|file|res|widget):$/,
	rnoContent = /^(?:GET|HEAD)$/,
	rprotocol = /^\/\//,
	rurl = /^([\w.+-]+:)(?:\/\/([^\/?#:]*)(?::(\d+)|)|)/,

	// Keep a copy of the old load method
	_load = jQuery.fn.load,

	/* Prefilters
	 * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
	 * 2) These are called:
	 *    - BEFORE asking for a transport
	 *    - AFTER param serialization (s.data is a string if s.processData is true)
	 * 3) key is the dataType
	 * 4) the catchall symbol "*" can be used
	 * 5) execution will start with transport dataType and THEN continue down to "*" if needed
	 */
	 //预过滤器，在发送ajax之前做一些处理
	prefilters = {},

	/* Transports bindings
	 * 1) key is the dataType
	 * 2) the catchall symbol "*" can be used
	 * 3) selection will start with transport dataType and THEN go to "*" if needed
	 */
	 //分发器，
	transports = {},

	// Avoid comment-prolog char sequence (#10098); must appease lint and evade compression
	allTypes = "*/".concat("*");

// #8138, IE may throw an exception when accessing
// a field from window.location if document.domain has been set
try {
	ajaxLocation = location.href;
} catch( e ) {
	// 兼容性，动态创建a标签，a标签的href是空，然后就可以获取当前页面地址
	ajaxLocation = document.createElement( "a" );
	ajaxLocation.href = "";
	ajaxLocation = ajaxLocation.href;
}

// Segment location into parts
ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];

// Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
function addToPrefiltersOrTransports( structure ) {

	// dataTypeExpression is optional and defaults to "*"
	return function( dataTypeExpression, func ) {

		if ( typeof dataTypeExpression !== "string" ) {
			func = dataTypeExpression;
			dataTypeExpression = "*";
		}

		var dataType,
			i = 0,
			dataTypes = dataTypeExpression.toLowerCase().match( core_rnotwhite ) || [];

		if ( jQuery.isFunction( func ) ) {
			// For each dataType in the dataTypeExpression
			while ( (dataType = dataTypes[i++]) ) {
				// Prepend if requested
				if ( dataType[0] === "+" ) {
					dataType = dataType.slice( 1 ) || "*";
					(structure[ dataType ] = structure[ dataType ] || []).unshift( func );

				// Otherwise append
				} else {
					(structure[ dataType ] = structure[ dataType ] || []).push( func );
				}
			}
		}
	};
}

// Base inspection function for prefilters and transports
function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR ) {

	var inspected = {},
		seekingTransport = ( structure === transports );

	function inspect( dataType ) {
		var selected;
		inspected[ dataType ] = true;
		jQuery.each( structure[ dataType ] || [], function( _, prefilterOrFactory ) {
			var dataTypeOrTransport = prefilterOrFactory( options, originalOptions, jqXHR );
			if( typeof dataTypeOrTransport === "string" && !seekingTransport && !inspected[ dataTypeOrTransport ] ) {
				options.dataTypes.unshift( dataTypeOrTransport );
				inspect( dataTypeOrTransport );
				return false;
			} else if ( seekingTransport ) {
				return !( selected = dataTypeOrTransport );
			}
		});
		return selected;
	}

	return inspect( options.dataTypes[ 0 ] ) || !inspected[ "*" ] && inspect( "*" );
}

// 继承
function ajaxExtend( target, src ) {
	var key, deep,
		flatOptions = jQuery.ajaxSettings.flatOptions || {};

	for ( key in src ) {
		if ( src[ key ] !== undefined ) {
			( flatOptions[ key ] ? target : ( deep || (deep = {}) ) )[ key ] = src[ key ];
		}
	}
	if ( deep ) {
		jQuery.extend( true, target, deep );
	}

	return target;
}

//	$('#div1').load("1.html ol,{'name':'hello'}",function(a,b,c){})
jQuery.fn.load = function( url, params, callback ) {
	if ( typeof url !== "string" && _load ) {
		return _load.apply( this, arguments );
	}

	var selector, type, response,
		self = this,
		off = url.indexOf(" ");

	if ( off >= 0 ) {
		selector = url.slice( off );
		url = url.slice( 0, off );
	}

	// If it's a function
	if ( jQuery.isFunction( params ) ) {

		// We assume that it's the callback
		callback = params;
		params = undefined;

	// Otherwise, build a param string
	} else if ( params && typeof params === "object" ) {
		type = "POST";//对象是post方式
	}

	// If we have elements to modify, make the request
	if ( self.length > 0 ) {
		jQuery.ajax({
			url: url,
			type: type,//默认是get
			dataType: "html",//返回数据类型
			data: params //传输数据
		}).done(function( responseText ) {//responseText返回的数据
			response = arguments;
	//self.html()添加到本元素的html内容中
			self.html( selector ? //有过滤器

				//动态创建div,添加返回的html,查找过滤器
				jQuery("<div>").append( jQuery.parseHTML( responseText ) ).find( selector ) :

				// Otherwise use the full result
				responseText );
//complete是完成不管成功失败
		}).complete( callback && function( jqXHR, status ) {
			self.each( callback, response || [ jqXHR.responseText, status, jqXHR ] );
		});
	}

	return this;
};

// Attach a bunch of functions for handling common AJAX events
jQuery.each( [ "ajaxStart", "ajaxStop", "ajaxComplete", "ajaxError", "ajaxSuccess", "ajaxSend" ], function( i, type ){
	jQuery.fn[ type ] = function( fn ){
		return this.on( type, fn );
	};
});

jQuery.extend({

	// Counter for holding the number of active queries
	active: 0,

	// Last-Modified header cache for next request
	lastModified: {},
	etag: {},

	//ajax默认参数
	ajaxSettings: {
		url: ajaxLocation,//ajaxLocation = location.href;默认是当前页面地址
		type: "GET",
		isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ), //是否本地
		global: true, //是否能触发全局事件参数
		processData: true,
		async: true,
		contentType: "application/x-www-form-urlencoded; charset=UTF-8",//数据编码操作，

		//注释是一样的，注释不写就是undefined，
		/*
		timeout: 0,     //超时处理，超时就提示是否继续等待还是离开还是刷新
		data: null,
		dataType: null,
		username: null,    //服务器的验证
		password: null,
		cache: null,   //cache:false,请求后面加一个时间戳，不会有缓存
		throws: false,  //
		traditional: false,  //传统模式
		headers: {},
		*/

		accepts: {
			"*": allTypes,
			text: "text/plain",
			html: "text/html",
			xml: "application/xml, text/xml",
			json: "application/json, text/javascript"
		},

		//检测响应头信息，判断返回的类型。
		contents: {
			xml: /xml/,
			html: /html/,
			json: /json/
		},

		responseFields: {
			xml: "responseXML",
			text: "responseText",
			json: "responseJSON"
		},

		// 根据返回的响应头信息，做不同的转换。
		converters: {

			// Convert anything to text
			"* text": String,

			// Text to html (true = no transformation)
			"text html": true,

			// Evaluate text as a json expression
			"text json": jQuery.parseJSON,

			// Parse text as xml
			"text xml": jQuery.parseXML
		},

		// For options that shouldn't be deep extended:
		// you can add your own custom options here if
		// and when you create one that shouldn't be
		// deep extended (see ajaxExtend)
		flatOptions: {
			url: true,
			context: true
		}
	},

	// 对json继承的封装
	ajaxSetup: function( target, settings ) {
		return settings ?

			//继承json过去
			ajaxExtend( ajaxExtend( target, jQuery.ajaxSettings ), settings ) :

			// Extending ajaxSettings
			ajaxExtend( jQuery.ajaxSettings, target );
	},

	ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
	ajaxTransport: addToPrefiltersOrTransports( transports ),

	// Main method
	/*
		$.ajax({
			url:url,
			type:'post',
			success : function(){},
			error:function(){}
		});

		$.ajax('url',{
			type:'post',
			success : function(){},
			error:function(){}
		});
	*/
	ajax: function( url, options ) {//url是地址，options是json
		if ( typeof url === "object" ) {//url是json就赋值给options
			options = url;
			url = undefined;
		}

		// Force options to be an object
		options = options || {};

		var transport,
			// URL without anti-cache param
			cacheURL,
			// Response headers
			responseHeadersString,
			responseHeaders,
			// timeout handle
			timeoutTimer,
			// Cross-domain detection vars
			parts,
			// To know if global events are to be dispatched
			fireGlobals,
			// Loop variable
			i,
			//options覆盖默认参数，继承
			s = jQuery.ajaxSetup( {}, options ),
			// Callbacks context
			callbackContext = s.context || s,
			// Context for global events is callbackContext if it is a DOM node or jQuery collection
			globalEventContext = s.context && ( callbackContext.nodeType || callbackContext.jquery ) ?
				jQuery( callbackContext ) :
				jQuery.event,
			// 延迟对象，回调对象
			deferred = jQuery.Deferred(),
			completeDeferred = jQuery.Callbacks("once memory"),
			// Status-dependent callbacks
			statusCode = s.statusCode || {},
			// Headers (they are sent all at once)
			requestHeaders = {},
			requestHeadersNames = {},
			// The jqXHR state
			state = 0,
			// Default abort message
			strAbort = "canceled",
			// Fake xhr
			jqXHR = {
				readyState: 0,//0--4,4的时候就是完成了

				// 获取响应头
				getResponseHeader: function( key ) {
					var match;
					if ( state === 2 ) {
						if ( !responseHeaders ) {
							responseHeaders = {};
							while ( (match = rheaders.exec( responseHeadersString )) ) {
								responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
							}
						}
						match = responseHeaders[ key.toLowerCase() ];
					}
					return match == null ? null : match;
				},

				// Raw string
				getAllResponseHeaders: function() {
					return state === 2 ? responseHeadersString : null;
				},

				// 设置请求头
				setRequestHeader: function( name, value ) {
					var lname = name.toLowerCase();
					if ( !state ) {
						name = requestHeadersNames[ lname ] = requestHeadersNames[ lname ] || name;
						requestHeaders[ name ] = value;
					}
					return this;
				},

				// Overrides response content-type header
				overrideMimeType: function( type ) {
					if ( !state ) {
						s.mimeType = type;
					}
					return this;
				},

				// Status-dependent callbacks
				statusCode: function( map ) {
					var code;
					if ( map ) {
						if ( state < 2 ) {
							for ( code in map ) {
								// Lazy-add the new callback in a way that preserves old ones
								statusCode[ code ] = [ statusCode[ code ], map[ code ] ];
							}
						} else {
							// Execute the appropriate callbacks
							jqXHR.always( map[ jqXHR.status ] );
						}
					}
					return this;
				},

				// 错误的时候，例如超时，报错
				abort: function( statusText ) {
					var finalText = statusText || strAbort;
					if ( transport ) {
						transport.abort( finalText );
					}
					done( 0, finalText );
					return this;
				}
			};

		// 方法加进去
		deferred.promise( jqXHR ).complete = completeDeferred.add;
		jqXHR.success = jqXHR.done;
		jqXHR.error = jqXHR.fail;

		// 对url处理，
		s.url = ( ( url || s.url || ajaxLocation ) + "" ).replace( rhash, "" )
			.replace( rprotocol, ajaxLocParts[ 1 ] + "//" );

		// Alias method option to type as per ticket #12004
		s.type = options.method || options.type || s.method || s.type;

		// Extract dataTypes list
		s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().match( core_rnotwhite ) || [""];

		// 跨域处理，不跟本网页是同一个主机地址。
		if ( s.crossDomain == null ) {
			parts = rurl.exec( s.url.toLowerCase() );
			s.crossDomain = !!( parts &&
				( parts[ 1 ] !== ajaxLocParts[ 1 ] || parts[ 2 ] !== ajaxLocParts[ 2 ] ||
					( parts[ 3 ] || ( parts[ 1 ] === "http:" ? "80" : "443" ) ) !==
						( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? "80" : "443" ) ) )
			);
		}

		// Convert data if not already a string
		if ( s.data && s.processData && typeof s.data !== "string" ) {
			s.data = jQuery.param( s.data, s.traditional );
		}

		// 触发回调
		inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );

		// 请求完成了
		if ( state === 2 ) {
			return jqXHR;
		}

		// We can fire global events as of now if asked to
		fireGlobals = s.global;

		// Watch for a new set of requests
		if ( fireGlobals && jQuery.active++ === 0 ) {
			jQuery.event.trigger("ajaxStart");
		}

		// Uppercase the type
		s.type = s.type.toUpperCase();

		// Determine if request has content
		s.hasContent = !rnoContent.test( s.type );

		// Save the URL in case we're toying with the If-Modified-Since
		// and/or If-None-Match header later on
		cacheURL = s.url;

		// More options handling for requests with no content
		if ( !s.hasContent ) {

			// If data is available, append data to url
			if ( s.data ) {
				cacheURL = ( s.url += ( ajax_rquery.test( cacheURL ) ? "&" : "?" ) + s.data );
				// #9682: remove data so that it's not used in an eventual retry
				delete s.data;
			}

			// 不缓存就添加随机数
			if ( s.cache === false ) {
				s.url = rts.test( cacheURL ) ?

					// If there is already a '_' parameter, set its value
					cacheURL.replace( rts, "$1_=" + ajax_nonce++ ) :

					// Otherwise add one to the end
					cacheURL + ( ajax_rquery.test( cacheURL ) ? "&" : "?" ) + "_=" + ajax_nonce++;
			}
		}

		// 设置头信息，数据没有改变走缓存，通过后端配合，数据改变发起新的请求。
		if ( s.ifModified ) {
			if ( jQuery.lastModified[ cacheURL ] ) {
				jqXHR.setRequestHeader( "If-Modified-Since", jQuery.lastModified[ cacheURL ] );
			}
			if ( jQuery.etag[ cacheURL ] ) {
				jqXHR.setRequestHeader( "If-None-Match", jQuery.etag[ cacheURL ] );
			}
		}

		// Set the correct header, if data is being sent
		if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
			jqXHR.setRequestHeader( "Content-Type", s.contentType );
		}

		// 设置请求类型
		jqXHR.setRequestHeader(
			"Accept",
			s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
				s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", " + allTypes + "; q=0.01" : "" ) :
				s.accepts[ "*" ]
		);

		// Check for headers option
		for ( i in s.headers ) {
			jqXHR.setRequestHeader( i, s.headers[ i ] );
		}

		// Allow custom headers/mimetypes and early abort
		if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
			// Abort if not done already and return
			return jqXHR.abort();
		}

		// aborting is no longer a cancellation
		strAbort = "abort";

		// Install callbacks on deferreds
		for ( i in { success: 1, error: 1, complete: 1 } ) {
			jqXHR[ i ]( s[ i ] );
		}

		// Get transport
		transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );

		// If no transport, we auto-abort
		if ( !transport ) {
			done( -1, "No Transport" );
		} else {
			jqXHR.readyState = 1;

			// Send global event
			if ( fireGlobals ) {
				globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
			}
			// Timeout
			if ( s.async && s.timeout > 0 ) {
				timeoutTimer = setTimeout(function() {
					jqXHR.abort("timeout");
				}, s.timeout );
			}

			try {
				state = 1;
				transport.send( requestHeaders, done );
			} catch ( e ) {
				// Propagate exception as error if not done
				if ( state < 2 ) {
					done( -1, e );
				// Simply rethrow otherwise
				} else {
					throw e;
				}
			}
		}

		// Callback for when everything is done
		function done( status, nativeStatusText, responses, headers ) {
			var isSuccess, success, error, response, modified,
				statusText = nativeStatusText;

			// Called once
			if ( state === 2 ) {
				return;
			}

			// State is "done" now
			state = 2;

			// Clear timeout if it exists
			if ( timeoutTimer ) {
				clearTimeout( timeoutTimer );
			}

			// Dereference transport for early garbage collection
			// (no matter how long the jqXHR object will be used)
			transport = undefined;

			// Cache response headers
			responseHeadersString = headers || "";

			// Set readyState
			jqXHR.readyState = status > 0 ? 4 : 0;

			// Determine if successful
			isSuccess = status >= 200 && status < 300 || status === 304;

			// Get response data
			if ( responses ) {
				response = ajaxHandleResponses( s, jqXHR, responses );
			}

			// Convert no matter what (that way responseXXX fields are always set)
			response = ajaxConvert( s, response, jqXHR, isSuccess );

			// If successful, handle type chaining
			if ( isSuccess ) {

				// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
				if ( s.ifModified ) {
					modified = jqXHR.getResponseHeader("Last-Modified");
					if ( modified ) {
						jQuery.lastModified[ cacheURL ] = modified;
					}
					modified = jqXHR.getResponseHeader("etag");
					if ( modified ) {
						jQuery.etag[ cacheURL ] = modified;
					}
				}

				// if no content
				if ( status === 204 || s.type === "HEAD" ) {
					statusText = "nocontent";

				// if not modified
				} else if ( status === 304 ) {
					statusText = "notmodified";

				// If we have data, let's convert it
				} else {
					statusText = response.state;
					success = response.data;
					error = response.error;
					isSuccess = !error;
				}
			} else {
				// We extract error from statusText
				// then normalize statusText and status for non-aborts
				error = statusText;
				if ( status || !statusText ) {
					statusText = "error";
					if ( status < 0 ) {
						status = 0;
					}
				}
			}

			// Set data for the fake xhr object
			jqXHR.status = status;
			jqXHR.statusText = ( nativeStatusText || statusText ) + "";

			// Success/Error
			if ( isSuccess ) {
				deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
			} else {
				deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
			}

			// Status-dependent callbacks
			jqXHR.statusCode( statusCode );
			statusCode = undefined;

			if ( fireGlobals ) {
				globalEventContext.trigger( isSuccess ? "ajaxSuccess" : "ajaxError",
					[ jqXHR, s, isSuccess ? success : error ] );
			}

			// Complete
			completeDeferred.fireWith( callbackContext, [ jqXHR, statusText ] );

			if ( fireGlobals ) {
				globalEventContext.trigger( "ajaxComplete", [ jqXHR, s ] );
				// Handle the global AJAX counter
				if ( !( --jQuery.active ) ) {
					jQuery.event.trigger("ajaxStop");
				}
			}
		}
//ajax方法结束后，返回jqXHR对象，$.ajax()方法后面就可以调用done、fail方法，$.ajax({url:url}).done().fail();
		return jqXHR;
	},

	getJSON: function( url, data, callback ) {
		return jQuery.get( url, data, callback, "json" );//调用jQuery.ajax()
	},

	getScript: function( url, callback ) {//请求js不传递参数
		return jQuery.get( url, undefined, callback, "script" );
		//调用jQuery.ajax()
	}
});

//["get","post"]每一个元素调用function( i, method )，i是索引method是'get'、'post'
jQuery.each( [ "get", "post" ], function( i, method ) {
//get，post挂载到jQuery静态方法,通过中括号挂载。
//$.get('url',{'aa':123},function(){'成功回调'},'返回数据类型xml、json')
	jQuery[ method ] = function( url, data, callback, type ) {
		// shift arguments if data argument was omitted
		if ( jQuery.isFunction( data ) ) {
			type = type || callback;
			callback = data;
			data = undefined;
		}

		return jQuery.ajax({
			url: url,
			type: method,
			dataType: type,
			data: data,
			success: callback
		});
	};
});

/* Handles responses to an ajax request:
 * - finds the right dataType (mediates between content-type and expected dataType)
 * - returns the corresponding response
 */
function ajaxHandleResponses( s, jqXHR, responses ) {

	var ct, type, finalDataType, firstDataType,
		contents = s.contents,
		dataTypes = s.dataTypes;

	// Remove auto dataType and get content-type in the process
	while( dataTypes[ 0 ] === "*" ) {
		dataTypes.shift();
		if ( ct === undefined ) {
			ct = s.mimeType || jqXHR.getResponseHeader("Content-Type");
		}
	}

	// Check if we're dealing with a known content-type
	if ( ct ) {
		for ( type in contents ) {
			if ( contents[ type ] && contents[ type ].test( ct ) ) {
				dataTypes.unshift( type );
				break;
			}
		}
	}

	// Check to see if we have a response for the expected dataType
	if ( dataTypes[ 0 ] in responses ) {
		finalDataType = dataTypes[ 0 ];
	} else {
		// Try convertible dataTypes
		for ( type in responses ) {
			if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
				finalDataType = type;
				break;
			}
			if ( !firstDataType ) {
				firstDataType = type;
			}
		}
		// Or just use first one
		finalDataType = finalDataType || firstDataType;
	}

	// If we found a dataType
	// We add the dataType to the list if needed
	// and return the corresponding response
	if ( finalDataType ) {
		if ( finalDataType !== dataTypes[ 0 ] ) {
			dataTypes.unshift( finalDataType );
		}
		return responses[ finalDataType ];
	}
}

//类型转换器，匹配返回的数据类型
function ajaxConvert( s, response, jqXHR, isSuccess ) {
	var conv2, current, conv, tmp, prev,
		converters = {},
		// Work with a copy of dataTypes in case we need to modify it for conversion
		dataTypes = s.dataTypes.slice();

	// Create converters map with lowercased keys
	if ( dataTypes[ 1 ] ) {
		for ( conv in s.converters ) {
			converters[ conv.toLowerCase() ] = s.converters[ conv ];
		}
	}

	current = dataTypes.shift();

	// Convert to each sequential dataType
	while ( current ) {

		if ( s.responseFields[ current ] ) {
			jqXHR[ s.responseFields[ current ] ] = response;
		}

		// Apply the dataFilter if provided
		if ( !prev && isSuccess && s.dataFilter ) {
			response = s.dataFilter( response, s.dataType );
		}

		prev = current;
		current = dataTypes.shift();

		if ( current ) {

		// There's only work to do if current dataType is non-auto
			if ( current === "*" ) {

				current = prev;

			// Convert response if prev dataType is non-auto and differs from current
			} else if ( prev !== "*" && prev !== current ) {

				// Seek a direct converter
				conv = converters[ prev + " " + current ] || converters[ "* " + current ];

				// If none found, seek a pair
				if ( !conv ) {
					for ( conv2 in converters ) {

						// If conv2 outputs current
						tmp = conv2.split( " " );
						if ( tmp[ 1 ] === current ) {

							// If prev can be converted to accepted input
							conv = converters[ prev + " " + tmp[ 0 ] ] ||
								converters[ "* " + tmp[ 0 ] ];
							if ( conv ) {
								// Condense equivalence converters
								if ( conv === true ) {
									conv = converters[ conv2 ];

								// Otherwise, insert the intermediate dataType
								} else if ( converters[ conv2 ] !== true ) {
									current = tmp[ 0 ];
									dataTypes.unshift( tmp[ 1 ] );
								}
								break;
							}
						}
					}
				}

				// Apply converter (if not an equivalence)
				if ( conv !== true ) {

					// Unless errors are allowed to bubble, catch and return them
					if ( conv && s[ "throws" ] ) {
						response = conv( response );
					} else {
						try {
							response = conv( response );
						} catch ( e ) {
							return { state: "parsererror", error: conv ? e : "No conversion from " + prev + " to " + current };
						}
					}
				}
			}
		}
	}

	return { state: "success", data: response };
}
// Install script dataType
jQuery.ajaxSetup({
	accepts: {
		script: "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"
	},
	contents: {
		script: /(?:java|ecma)script/
	},
	converters: {
		"text script": function( text ) {
			jQuery.globalEval( text );
			return text;
		}
	}
});

// 发送ajax之前对数据做处理
jQuery.ajaxPrefilter( "script", function( s ) {
	if ( s.cache === undefined ) {
		s.cache = false;
	}
	if ( s.crossDomain ) {
		s.type = "GET";
	}
});

// Bind script tag hack transport
jQuery.ajaxTransport( "script", function( s ) {
	// This transport only deals with cross domain requests
	if ( s.crossDomain ) {
		var script, callback;
		return {
			send: function( _, complete ) {
				script = jQuery("<script>").prop({
					async: true,
					charset: s.scriptCharset,
					src: s.url
				}).on(
					"load error",
					callback = function( evt ) {
						script.remove();
						callback = null;
						if ( evt ) {
							complete( evt.type === "error" ? 404 : 200, evt.type );
						}
					}
				);
				document.head.appendChild( script[ 0 ] );
			},
			abort: function() {
				if ( callback ) {
					callback();
				}
			}
		};
	}
});
var oldCallbacks = [],
	rjsonp = /(=)\?(?=&|$)|\?\?/;

// Default jsonp settings
jQuery.ajaxSetup({
	jsonp: "callback",
	jsonpCallback: function() {
		var callback = oldCallbacks.pop() || ( jQuery.expando + "_" + ( ajax_nonce++ ) );
		this[ callback ] = true;
		return callback;
	}
});

// Detect, normalize options and install callbacks for jsonp requests
jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {

	var callbackName, overwritten, responseContainer,
		jsonProp = s.jsonp !== false && ( rjsonp.test( s.url ) ?
			"url" :
			typeof s.data === "string" && !( s.contentType || "" ).indexOf("application/x-www-form-urlencoded") && rjsonp.test( s.data ) && "data"
		);

	// Handle iff the expected data type is "jsonp" or we have a parameter to set
	if ( jsonProp || s.dataTypes[ 0 ] === "jsonp" ) {

		// Get callback name, remembering preexisting value associated with it
		callbackName = s.jsonpCallback = jQuery.isFunction( s.jsonpCallback ) ?
			s.jsonpCallback() :
			s.jsonpCallback;

		// Insert callback into url or form data
		if ( jsonProp ) {
			s[ jsonProp ] = s[ jsonProp ].replace( rjsonp, "$1" + callbackName );
		} else if ( s.jsonp !== false ) {
			s.url += ( ajax_rquery.test( s.url ) ? "&" : "?" ) + s.jsonp + "=" + callbackName;
		}

		// Use data converter to retrieve json after script execution
		s.converters["script json"] = function() {
			if ( !responseContainer ) {
				jQuery.error( callbackName + " was not called" );
			}
			return responseContainer[ 0 ];
		};

		// force json dataType
		s.dataTypes[ 0 ] = "json";

		// Install callback
		overwritten = window[ callbackName ];
		window[ callbackName ] = function() {
			responseContainer = arguments;
		};

		// Clean-up function (fires after converters)
		jqXHR.always(function() {
			// Restore preexisting value
			window[ callbackName ] = overwritten;

			// Save back as free
			if ( s[ callbackName ] ) {
				// make sure that re-using the options doesn't screw things around
				s.jsonpCallback = originalSettings.jsonpCallback;

				// save the callback name for future use
				oldCallbacks.push( callbackName );
			}

			// Call if it was a function and we have a response
			if ( responseContainer && jQuery.isFunction( overwritten ) ) {
				overwritten( responseContainer[ 0 ] );
			}

			responseContainer = overwritten = undefined;
		});

		// Delegate to script
		return "script";
	}
});
jQuery.ajaxSettings.xhr = function() {
	try {
		return new XMLHttpRequest();
	} catch( e ) {}
};

var xhrSupported = jQuery.ajaxSettings.xhr(),
	xhrSuccessStatus = {
		// file protocol always yields status code 0, assume 200
		0: 200,
		// Support: IE9
		// #1450: sometimes IE returns 1223 when it should be 204
		1223: 204
	},
	// Support: IE9
	// We need to keep track of outbound xhr and abort them manually
	// because IE is not smart enough to do it all by itself
	xhrId = 0,
	xhrCallbacks = {};

if ( window.ActiveXObject ) {
	jQuery( window ).on( "unload", function() {
		for( var key in xhrCallbacks ) {
			xhrCallbacks[ key ]();
		}
		xhrCallbacks = undefined;
	});
}

jQuery.support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
jQuery.support.ajax = xhrSupported = !!xhrSupported;

jQuery.ajaxTransport(function( options ) {
	var callback;
	// Cross domain only allowed if supported through XMLHttpRequest
	if ( jQuery.support.cors || xhrSupported && !options.crossDomain ) {
		return {
			send: function( headers, complete ) {
				var i, id,
				//xhr是原生XMLHttpRequest对象
					xhr = options.xhr();
				xhr.open( options.type, options.url, options.async, options.username, options.password );
				// Apply custom fields if provided
				if ( options.xhrFields ) {
					for ( i in options.xhrFields ) {
						xhr[ i ] = options.xhrFields[ i ];
					}
				}
				// 跨域处理
				if ( options.mimeType && xhr.overrideMimeType ) {
					xhr.overrideMimeType( options.mimeType );
				}
				// X-Requested-With header
				// For cross-domain requests, seeing as conditions for a preflight are
				// akin to a jigsaw puzzle, we simply never set it to be sure.
				// (it can always be set on a per-request basis or even using ajaxSetup)
				// For same-domain requests, won't change header if already provided.
				if ( !options.crossDomain && !headers["X-Requested-With"] ) {
					headers["X-Requested-With"] = "XMLHttpRequest";
				}
				// Set headers
				for ( i in headers ) {
					xhr.setRequestHeader( i, headers[ i ] );
				}
				// Callback
				callback = function( type ) {
					return function() {
						if ( callback ) {
							delete xhrCallbacks[ id ];
							callback = xhr.onload = xhr.onerror = null;
							if ( type === "abort" ) {
								xhr.abort();
							} else if ( type === "error" ) {
								complete(
									// file protocol always yields status 0, assume 404
									xhr.status || 404,
									xhr.statusText
								);
							} else {
								complete(
									xhrSuccessStatus[ xhr.status ] || xhr.status,
									xhr.statusText,
									// Support: IE9
									// #11426: When requesting binary data, IE9 will throw an exception
									// on any attempt to access responseText
									typeof xhr.responseText === "string" ? {
										text: xhr.responseText
									} : undefined,
									xhr.getAllResponseHeaders()
								);
							}
						}
					};
				};
				// 真正完成才会走onload
				xhr.onload = callback();
				xhr.onerror = callback("error");
				// Create the abort callback
				callback = xhrCallbacks[( id = xhrId++ )] = callback("abort");
				// Do send the request
				// This may raise an exception which is actually
				// handled in jQuery.ajax (so no try/catch here)
				//发送
				xhr.send( options.hasContent && options.data || null );
			},
			abort: function() {
				if ( callback ) {
					callback();
				}
			}
		};
	}
});

}
//////////////////////////ajax结束////////////////////////////////////////////////////////////////////

//////////////////////////animate() : 运动的方法开始
{
var fxNow, timerId,
	rfxtypes = /^(?:toggle|show|hide)$/,
	rfxnum = new RegExp( "^(?:([+-])=|)(" + core_pnum + ")([a-z%]*)$", "i" ),
	rrun = /queueHooks$/,
	animationPrefilters = [ defaultPrefilter ],
	tweeners = {
		"*": [function( prop, value ) {
			var tween = this.createTween( prop, value ),
				target = tween.cur(),
				parts = rfxnum.exec( value ),
				unit = parts && parts[ 3 ] || ( jQuery.cssNumber[ prop ] ? "" : "px" ),

				// Starting value computation is required for potential unit mismatches
				start = ( jQuery.cssNumber[ prop ] || unit !== "px" && +target ) &&
					rfxnum.exec( jQuery.css( tween.elem, prop ) ),
				scale = 1,
				maxIterations = 20;

			if ( start && start[ 3 ] !== unit ) {
				// Trust units reported by jQuery.css
				unit = unit || start[ 3 ];

				// Make sure we update the tween properties later on
				parts = parts || [];

				// Iteratively approximate from a nonzero starting point
				start = +target || 1;

				do {
					// If previous iteration zeroed out, double until we get *something*
					// Use a string for doubling factor so we don't accidentally see scale as unchanged below
					scale = scale || ".5";

					// Adjust and apply
					start = start / scale;
					jQuery.style( tween.elem, prop, start + unit );

				// Update scale, tolerating zero or NaN from tween.cur()
				// And breaking the loop if scale is unchanged or perfect, or if we've just had enough
				} while ( scale !== (scale = tween.cur() / target) && scale !== 1 && --maxIterations );
			}

			// Update tween properties
			if ( parts ) {
				start = tween.start = +start || +target || 0;
				tween.unit = unit;
				// If a +=/-= token was provided, we're doing a relative animation
				tween.end = parts[ 1 ] ?
					start + ( parts[ 1 ] + 1 ) * parts[ 2 ] :
					+parts[ 2 ];
			}

			return tween;
		}]
	};

// Animations created synchronously will run synchronously
function createFxNow() {
	setTimeout(function() {
		fxNow = undefined;
	});
	return ( fxNow = jQuery.now() );
}

function createTween( value, prop, animation ) {
	var tween,
		collection = ( tweeners[ prop ] || [] ).concat( tweeners[ "*" ] ),
		index = 0,
		length = collection.length;
	for ( ; index < length; index++ ) {
		if ( (tween = collection[ index ].call( animation, prop, value )) ) {

			// we're done with this property
			return tween;
		}
	}
}

function Animation( elem, properties, options ) {
	var result,
		stopped,
		index = 0,
		length = animationPrefilters.length,
		deferred = jQuery.Deferred().always( function() {
			// don't match elem in the :animated selector
			delete tick.elem;
		}),
		tick = function() {
			if ( stopped ) {
				return false;
			}
			var currentTime = fxNow || createFxNow(),
				remaining = Math.max( 0, animation.startTime + animation.duration - currentTime ),
				// archaic crash bug won't allow us to use 1 - ( 0.5 || 0 ) (#12497)
				temp = remaining / animation.duration || 0,
				percent = 1 - temp,
				index = 0,
				length = animation.tweens.length;

			for ( ; index < length ; index++ ) {
				animation.tweens[ index ].run( percent );
			}

			deferred.notifyWith( elem, [ animation, percent, remaining ]);

			if ( percent < 1 && length ) {
				return remaining;
			} else {
				deferred.resolveWith( elem, [ animation ] );
				return false;
			}
		},
		animation = deferred.promise({
			elem: elem,
			props: jQuery.extend( {}, properties ),
			opts: jQuery.extend( true, { specialEasing: {} }, options ),
			originalProperties: properties,
			originalOptions: options,
			startTime: fxNow || createFxNow(),
			duration: options.duration,
			tweens: [],
			createTween: function( prop, end ) {
				var tween = jQuery.Tween( elem, animation.opts, prop, end,
						animation.opts.specialEasing[ prop ] || animation.opts.easing );
				animation.tweens.push( tween );
				return tween;
			},
			stop: function( gotoEnd ) {
				var index = 0,
					// if we are going to the end, we want to run all the tweens
					// otherwise we skip this part
					length = gotoEnd ? animation.tweens.length : 0;
				if ( stopped ) {
					return this;
				}
				stopped = true;
				for ( ; index < length ; index++ ) {
					animation.tweens[ index ].run( 1 );
				}

				// resolve when we played the last frame
				// otherwise, reject
				if ( gotoEnd ) {
					deferred.resolveWith( elem, [ animation, gotoEnd ] );
				} else {
					deferred.rejectWith( elem, [ animation, gotoEnd ] );
				}
				return this;
			}
		}),
		props = animation.props;

	propFilter( props, animation.opts.specialEasing );

	for ( ; index < length ; index++ ) {
		result = animationPrefilters[ index ].call( animation, elem, props, animation.opts );
		if ( result ) {
			return result;
		}
	}

	jQuery.map( props, createTween, animation );

	if ( jQuery.isFunction( animation.opts.start ) ) {
		animation.opts.start.call( elem, animation );
	}

	jQuery.fx.timer(
		jQuery.extend( tick, {
			elem: elem,
			anim: animation,
			queue: animation.opts.queue
		})
	);

	// attach callbacks from options
	return animation.progress( animation.opts.progress )
		.done( animation.opts.done, animation.opts.complete )
		.fail( animation.opts.fail )
		.always( animation.opts.always );
}

//属性的过滤操作
function propFilter( props, specialEasing ) {
	var index, name, easing, value, hooks;

	// camelCase, specialEasing and expand cssHook pass
	for ( index in props ) {
		name = jQuery.camelCase( index );
		easing = specialEasing[ name ];
		value = props[ index ];
		if ( jQuery.isArray( value ) ) {
			easing = value[ 1 ];
			value = props[ index ] = value[ 0 ];
		}

		if ( index !== name ) {
			props[ name ] = value;
			delete props[ index ];
		}

		hooks = jQuery.cssHooks[ name ];
		if ( hooks && "expand" in hooks ) {
			value = hooks.expand( value );
			delete props[ name ];

			// not quite $.extend, this wont overwrite keys already present.
			// also - reusing 'index' from above because we have the correct "name"
			for ( index in value ) {
				if ( !( index in props ) ) {
					props[ index ] = value[ index ];
					specialEasing[ index ] = easing;
				}
			}
		} else {
			specialEasing[ name ] = easing;
		}
	}
}

jQuery.Animation = jQuery.extend( Animation, {

	tweener: function( props, callback ) {
		if ( jQuery.isFunction( props ) ) {
			callback = props;
			props = [ "*" ];
		} else {
			props = props.split(" ");
		}

		var prop,
			index = 0,
			length = props.length;

		for ( ; index < length ; index++ ) {
			prop = props[ index ];
			tweeners[ prop ] = tweeners[ prop ] || [];
			tweeners[ prop ].unshift( callback );
		}
	},

	prefilter: function( callback, prepend ) {
		if ( prepend ) {
			animationPrefilters.unshift( callback );
		} else {
			animationPrefilters.push( callback );
		}
	}
});

function defaultPrefilter( elem, props, opts ) {
	/* jshint validthis: true */
	var prop, value, toggle, tween, hooks, oldfire,
		anim = this,
		orig = {},
		style = elem.style,
		hidden = elem.nodeType && isHidden( elem ),
		dataShow = data_priv.get( elem, "fxshow" );

	// handle queue: false promises
	if ( !opts.queue ) {
		hooks = jQuery._queueHooks( elem, "fx" );
		if ( hooks.unqueued == null ) {
			hooks.unqueued = 0;
			oldfire = hooks.empty.fire;
			hooks.empty.fire = function() {
				if ( !hooks.unqueued ) {
					oldfire();
				}
			};
		}
		hooks.unqueued++;

		anim.always(function() {
			// doing this makes sure that the complete handler will be called
			// before this completes
			anim.always(function() {
				hooks.unqueued--;
				if ( !jQuery.queue( elem, "fx" ).length ) {
					hooks.empty.fire();
				}
			});
		});
	}

	// height/width overflow pass
	if ( elem.nodeType === 1 && ( "height" in props || "width" in props ) ) {
		// Make sure that nothing sneaks out
		// Record all 3 overflow attributes because IE9-10 do not
		// change the overflow attribute when overflowX and
		// overflowY are set to the same value
		opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];

		// Set display property to inline-block for height/width
		// animations on inline elements that are having width/height animated
		if ( jQuery.css( elem, "display" ) === "inline" &&
				jQuery.css( elem, "float" ) === "none" ) {

			style.display = "inline-block";
		}
	}

	if ( opts.overflow ) {
		style.overflow = "hidden";
		anim.always(function() {
			style.overflow = opts.overflow[ 0 ];
			style.overflowX = opts.overflow[ 1 ];
			style.overflowY = opts.overflow[ 2 ];
		});
	}

	// show/hide pass
	for ( prop in props ) {
		value = props[ prop ];
		if ( rfxtypes.exec( value ) ) {
			delete props[ prop ];
			toggle = toggle || value === "toggle";
			if ( value === ( hidden ? "hide" : "show" ) ) {

				// If there is dataShow left over from a stopped hide or show and we are going to proceed with show, we should pretend to be hidden
				if ( value === "show" && dataShow && dataShow[ prop ] !== undefined ) {
					hidden = true;
				} else {
					continue;
				}
			}
			orig[ prop ] = dataShow && dataShow[ prop ] || jQuery.style( elem, prop );
		}
	}

	if ( !jQuery.isEmptyObject( orig ) ) {
		if ( dataShow ) {
			if ( "hidden" in dataShow ) {
				hidden = dataShow.hidden;
			}
		} else {
			dataShow = data_priv.access( elem, "fxshow", {} );
		}

		// store state if its toggle - enables .stop().toggle() to "reverse"
		if ( toggle ) {
			dataShow.hidden = !hidden;
		}
		if ( hidden ) {
			jQuery( elem ).show();
		} else {
			anim.done(function() {
				jQuery( elem ).hide();
			});
		}
		anim.done(function() {
			var prop;

			data_priv.remove( elem, "fxshow" );
			for ( prop in orig ) {
				jQuery.style( elem, prop, orig[ prop ] );
			}
		});
		for ( prop in orig ) {
			tween = createTween( hidden ? dataShow[ prop ] : 0, prop, anim );

			if ( !( prop in dataShow ) ) {
				dataShow[ prop ] = tween.start;
				if ( hidden ) {
					tween.end = tween.start;
					tween.start = prop === "width" || prop === "height" ? 1 : 0;
				}
			}
		}
	}
}

function Tween( elem, options, prop, end, easing ) {
	return new Tween.prototype.init( elem, options, prop, end, easing );
}
jQuery.Tween = Tween;

Tween.prototype = {
	constructor: Tween,
	init: function( elem, options, prop, end, easing, unit ) {
		this.elem = elem;
		this.prop = prop;
		this.easing = easing || "swing";
		this.options = options;
		this.start = this.now = this.cur();
		this.end = end;
		this.unit = unit || ( jQuery.cssNumber[ prop ] ? "" : "px" );
	},
	cur: function() {
		var hooks = Tween.propHooks[ this.prop ];

		return hooks && hooks.get ?
			hooks.get( this ) :
			Tween.propHooks._default.get( this );
	},
	//执行运动算法
	run: function( percent ) {
		var eased,
			hooks = Tween.propHooks[ this.prop ];

		if ( this.options.duration ) {
			this.pos = eased = jQuery.easing[ this.easing ](
				percent, this.options.duration * percent, 0, 1, this.options.duration
			);
		} else {
			this.pos = eased = percent;
		}
		this.now = ( this.end - this.start ) * eased + this.start;

		if ( this.options.step ) {
			this.options.step.call( this.elem, this.now, this );
		}

		if ( hooks && hooks.set ) {
			hooks.set( this );
		} else {
			Tween.propHooks._default.set( this );
		}
		return this;
	}
};

Tween.prototype.init.prototype = Tween.prototype;

Tween.propHooks = {
	_default: {
		get: function( tween ) {
			var result;

			if ( tween.elem[ tween.prop ] != null &&
				(!tween.elem.style || tween.elem.style[ tween.prop ] == null) ) {
				return tween.elem[ tween.prop ];
			}

			// passing an empty string as a 3rd parameter to .css will automatically
			// attempt a parseFloat and fallback to a string if the parse fails
			// so, simple values such as "10px" are parsed to Float.
			// complex values such as "rotate(1rad)" are returned as is.
			result = jQuery.css( tween.elem, tween.prop, "" );
			// Empty strings, null, undefined and "auto" are converted to 0.
			return !result || result === "auto" ? 0 : result;
		},
		set: function( tween ) {
			// use step hook for back compat - use cssHook if its there - use .style if its
			// available and use plain properties where available
			if ( jQuery.fx.step[ tween.prop ] ) {
				jQuery.fx.step[ tween.prop ]( tween );
			} else if ( tween.elem.style && ( tween.elem.style[ jQuery.cssProps[ tween.prop ] ] != null || jQuery.cssHooks[ tween.prop ] ) ) {
				jQuery.style( tween.elem, tween.prop, tween.now + tween.unit );
			} else {
				tween.elem[ tween.prop ] = tween.now;
			}
		}
	}
};

// Support: IE9
// Panic based approach to setting things on disconnected nodes

Tween.propHooks.scrollTop = Tween.propHooks.scrollLeft = {
	set: function( tween ) {
		if ( tween.elem.nodeType && tween.elem.parentNode ) {
			tween.elem[ tween.prop ] = tween.now;
		}
	}
};

jQuery.each([ "toggle", "show", "hide" ], function( i, name ) {
	var cssFn = jQuery.fn[ name ];//之前的方法
	jQuery.fn[ name ] = function( speed, easing, callback ) {
		return speed == null || typeof speed === "boolean" ?
			cssFn.apply( this, arguments ) ://有参数调用原来的
			this.animate( genFx( name, true ), speed, easing, callback );//没参数调用animate，genFx( name, true )返回一个json:{ width : 'hide' , height : 'hide' , opacity : 'hide' }
	};
});

jQuery.fn.extend({
	fadeTo: function( speed, to, easing, callback ) {

		// 如果是隐藏，设置透明度是0再显示，再做动画。
		return this.filter( isHidden ).css( "opacity", 0 ).show()

			// animate to the value specified
			.end().animate({ opacity: to }, speed, easing, callback );
	},

	/*$('#div1').animate({ height : 300 },1000);
	//配置写运动
	$('#div1').animate({ width : 400 },{
		duration : 'slow',  //速度慢速
		easing : 'linear',  //匀速
		complete : function(){  //完成回调
			alert(111);
		}
	});*/
	animate: function( prop, speed, easing, callback ) {
		var empty = jQuery.isEmptyObject( prop ),
			optall = jQuery.speed( speed, easing, callback ),//参数做配置
			doAnimation = function() {
				// Operate on a copy of prop so per-property easing won't be lost
				var anim = Animation( this, jQuery.extend( {}, prop ), optall );

				// Empty animations, or finishing resolves immediately
				if ( empty || data_priv.get( this, "finish" ) ) {
					anim.stop( true );
				}
			};
			doAnimation.finish = doAnimation;

		return empty || optall.queue === false ?
			this.each( doAnimation ) ://遍历函数
			this.queue( optall.queue, doAnimation );//入队，doAnimation入队的每一个函数
	},
	stop: function( type, clearQueue, gotoEnd ) {
		var stopQueue = function( hooks ) {
			var stop = hooks.stop;
			delete hooks.stop;
			stop( gotoEnd );
		};

		if ( typeof type !== "string" ) {
			gotoEnd = clearQueue;
			clearQueue = type;
			type = undefined;
		}
		if ( clearQueue && type !== false ) {//true
			this.queue( type || "fx", [] );//队列清空
		}

		return this.each(function() {
			var dequeue = true,
				index = type != null && type + "queueHooks",
				timers = jQuery.timers,
				data = data_priv.get( this );

			if ( index ) {
				if ( data[ index ] && data[ index ].stop ) {
					stopQueue( data[ index ] );
				}
			} else {
				for ( index in data ) {
					if ( data[ index ] && data[ index ].stop && rrun.test( index ) ) {
						stopQueue( data[ index ] );
					}
				}
			}

			for ( index = timers.length; index--; ) {
				if ( timers[ index ].elem === this && (type == null || timers[ index ].queue === type) ) {
					timers[ index ].anim.stop( gotoEnd );
					dequeue = false;
					timers.splice( index, 1 );
				}
			}

			// start the next in the queue if the last step wasn't forced
			// timers currently will call their complete callbacks, which will dequeue
			// but only if they were gotoEnd
			if ( dequeue || !gotoEnd ) {
				jQuery.dequeue( this, type );
			}
		});
	},
	finish: function( type ) {
		if ( type !== false ) {
			type = type || "fx";
		}
		return this.each(function() {
			var index,
				data = data_priv.get( this ),
				queue = data[ type + "queue" ],
				hooks = data[ type + "queueHooks" ],
				timers = jQuery.timers,
				length = queue ? queue.length : 0;

			// enable finishing flag on private data
			data.finish = true;

			// empty the queue first
			jQuery.queue( this, type, [] );

			if ( hooks && hooks.stop ) {
				hooks.stop.call( this, true );
			}

			// look for any active animations, and finish them
			for ( index = timers.length; index--; ) {
				if ( timers[ index ].elem === this && timers[ index ].queue === type ) {
					timers[ index ].anim.stop( true );
					timers.splice( index, 1 );
				}
			}

			// look for any animations in the old queue and finish them
			for ( index = 0; index < length; index++ ) {
				if ( queue[ index ] && queue[ index ].finish ) {
					queue[ index ].finish.call( this );
				}
			}

			// turn off finishing flag
			delete data.finish;
		});
	}
});

// 创建json:{ width : 'hide' , height : 'hide' , opacity : 'hide' }
function genFx( type, includeWidth ) {
	var which,
		attrs = { height: type },
		i = 0;

	// if we include width, step value is 1 to do all cssExpand values,
	// if we don't include width, step value is 2 to skip over Left and Right
	includeWidth = includeWidth? 1 : 0;
	//
	for( ; i < 4 ; i += 2 - includeWidth ) {
		which = cssExpand[ i ];
		attrs[ "margin" + which ] = attrs[ "padding" + which ] = type;
	}

	if ( includeWidth ) {
		attrs.opacity = attrs.width = type;
	}

	return attrs;
}

// Generate shortcuts for custom animations
jQuery.each({
	slideDown: genFx("show"),
	slideUp: genFx("hide"),
	slideToggle: genFx("toggle"),
	fadeIn: { opacity: "show" },
	fadeOut: { opacity: "hide" },
	fadeToggle: { opacity: "toggle" }
}, function( name, props ) {
	jQuery.fn[ name ] = function( speed, easing, callback ) {
		return this.animate( props, speed, easing, callback );
	};
});

jQuery.speed = function( speed, easing, fn ) {
	var opt = speed && typeof speed === "object" ? jQuery.extend( {}, speed ) : {
		complete: fn || !fn && easing ||
			jQuery.isFunction( speed ) && speed,
		duration: speed,
		easing: fn && easing || easing && !jQuery.isFunction( easing ) && easing
	};

	////jQuery.fx.off = true;  //关闭页面所有的运动，运动时间为0，
	opt.duration = jQuery.fx.off ? 0 : typeof opt.duration === "number" ? opt.duration :
	/*jQuery.fx.speeds = {
		slow: 600,
		fast: 200,
		// Default speed
		_default: 400
	};*/
		opt.duration in jQuery.fx.speeds ? jQuery.fx.speeds[ opt.duration ] : jQuery.fx.speeds._default;

	// normalize opt.queue - true/undefined/null -> "fx"
	if ( opt.queue == null || opt.queue === true ) {
		opt.queue = "fx";
	}

	// 自己写的complete
	opt.old = opt.complete;

	opt.complete = function() {
		if ( jQuery.isFunction( opt.old ) ) {
			opt.old.call( this );
		}

		if ( opt.queue ) {
			jQuery.dequeue( this, opt.queue );
		}
	};

	return opt;
};

jQuery.easing = {
	linear: function( p ) {
		return p;
	},
	swing: function( p ) {
		return 0.5 - Math.cos( p*Math.PI ) / 2;
	}
};

jQuery.timers = [];
jQuery.fx = Tween.prototype.init;
jQuery.fx.tick = function() {
	var timer,
		timers = jQuery.timers,
		i = 0;

	fxNow = jQuery.now();

	for ( ; i < timers.length; i++ ) {
		timer = timers[ i ];
		// Checks the timer has not already been removed
		if ( !timer() && timers[ i ] === timer ) {
			timers.splice( i--, 1 );
		}
	}

	if ( !timers.length ) {
		jQuery.fx.stop();//停止运动
	}
	fxNow = undefined;
};

jQuery.fx.timer = function( timer ) {
	if ( timer() && jQuery.timers.push( timer ) ) {
		jQuery.fx.start();
	}
};

jQuery.fx.interval = 13;

jQuery.fx.start = function() {
	if ( !timerId ) {
		timerId = setInterval( jQuery.fx.tick, jQuery.fx.interval );
	}
};

jQuery.fx.stop = function() {
	clearInterval( timerId );
	timerId = null;
};

jQuery.fx.speeds = {
	slow: 600,
	fast: 200,
	// Default speed
	_default: 400
};
}
//////////////////////////animate() : 运动的方法结束
// Back Compat <1.8 extension point
jQuery.fx.step = {};

if ( jQuery.expr && jQuery.expr.filters ) {
	jQuery.expr.filters.animated = function( elem ) {
		return jQuery.grep(jQuery.timers, function( fn ) {
			return elem === fn.elem;
		}).length;
	};
}
jQuery.fn.offset = function( options ) {
	if ( arguments.length ) {//设置
		return options === undefined ?
			this :
			this.each(function( i ) {//每一个元素设置
				jQuery.offset.setOffset( this, options, i );
			});
	}
//获取
	var docElem, win,
		elem = this[ 0 ],
		box = { top: 0, left: 0 },
		doc = elem && elem.ownerDocument;//document

	if ( !doc ) {
		return;
	}

	docElem = doc.documentElement;//html标签

	// Make sure it's not a disconnected DOM node
	if ( !jQuery.contains( docElem, elem ) ) {
		return box;
	}

	// getBoundingClientRect()得到一些属性值:ClientRect {top: 8, right: 58, bottom: 58, left: 8, width: 50…},是到可视区的不包含滚动区域，
	if ( typeof elem.getBoundingClientRect !== core_strundefined ) {
		box = elem.getBoundingClientRect();
	}
	win = getWindow( doc );//获取window
	//pageYOffset是y轴的滚动距离，clientTop边框宽度，
	return {
		top: box.top + win.pageYOffset - docElem.clientTop,
		left: box.left + win.pageXOffset - docElem.clientLeft
	};
};

jQuery.offset = {
//设置offset
	setOffset: function( elem, options, i ) {
		var curPosition, curLeft, curCSSTop, curTop, curOffset, curCSSLeft, calculatePosition,
			position = jQuery.css( elem, "position" ),//获取元素的position属性，
			curElem = jQuery( elem ),
			props = {};

		// Set position first, in-case top/left are set even on static elem
		if ( position === "static" ) {//没有定位就加一个相对定位
			elem.style.position = "relative";
		}

		curOffset = curElem.offset();
		curCSSTop = jQuery.css( elem, "top" );
		curCSSLeft = jQuery.css( elem, "left" );
		calculatePosition = ( position === "absolute" || position === "fixed" ) && ( curCSSTop + curCSSLeft ).indexOf("auto") > -1;

		// Need to be able to calculate position if either top or left is auto and position is either absolute or fixed
		if ( calculatePosition ) {
			curPosition = curElem.position();
			curTop = curPosition.top;
			curLeft = curPosition.left;

		} else {
			curTop = parseFloat( curCSSTop ) || 0;
			curLeft = parseFloat( curCSSLeft ) || 0;
		}

		if ( jQuery.isFunction( options ) ) {
			options = options.call( elem, i, curOffset );
		}

		if ( options.top != null ) {
			props.top = ( options.top - curOffset.top ) + curTop;
		}
		if ( options.left != null ) {
			props.left = ( options.left - curOffset.left ) + curLeft;
		}

		if ( "using" in options ) {
			options.using.call( elem, props );

		} else {
			curElem.css( props );
		}
	}
};

jQuery.fn.extend({

	position: function() {//获取
		if ( !this[ 0 ] ) {
			return;
		}

		var offsetParent, offset,
			elem = this[ 0 ],
			parentOffset = { top: 0, left: 0 };

		// Fixed elements are offset from window (parentOffset = {top:0, left: 0}, because it is it's only offset parent
		if ( jQuery.css( elem, "position" ) === "fixed" ) {
			// We assume that getBoundingClientRect is available when computed position is fixed
			offset = elem.getBoundingClientRect();

		} else {
			// 原生方法找父级
			offsetParent = this.offsetParent();

			// Get correct offsets
			offset = this.offset();
			if ( !jQuery.nodeName( offsetParent[ 0 ], "html" ) ) {
				parentOffset = offsetParent.offset();
			}

			// Add offsetParent borders
			parentOffset.top += jQuery.css( offsetParent[ 0 ], "borderTopWidth", true );
			parentOffset.left += jQuery.css( offsetParent[ 0 ], "borderLeftWidth", true );
		}

		// 自己的top减去父级的top
		return {
			top: offset.top - parentOffset.top - jQuery.css( elem, "marginTop", true ),
			left: offset.left - parentOffset.left - jQuery.css( elem, "marginLeft", true )
		};
	},

	offsetParent: function() {
		return this.map(function() {
			var offsetParent = this.offsetParent || docElem;

			while ( offsetParent && ( !jQuery.nodeName( offsetParent, "html" ) && jQuery.css( offsetParent, "position") === "static" ) ) {
				offsetParent = offsetParent.offsetParent;
			}

			return offsetParent || docElem;
		});
	}
});

// Create scrollLeft and scrollTop methods
jQuery.each( {scrollLeft: "pageXOffset", scrollTop: "pageYOffset"}, function( method, prop ) {
	var top = "pageYOffset" === prop;

	jQuery.fn[ method ] = function( val ) {
		return jQuery.access( this, function( elem, method, val ) {
			var win = getWindow( elem );

			if ( val === undefined ) {
				return win ? win[ prop ] : elem[ method ];
			}

			if ( win ) {
				win.scrollTo(
					!top ? val : window.pageXOffset,
					top ? val : window.pageYOffset
				);

			} else {
				elem[ method ] = val;//原生的方法
			}
		}, method, val, arguments.length, null );
	};
});

function getWindow( elem ) {
	return jQuery.isWindow( elem ) ? elem : elem.nodeType === 9 && elem.defaultView;
}
// Create innerHeight, innerWidth, height, width, outerHeight and outerWidth methods
jQuery.each( { Height: "height", Width: "width" }, function( name, type ) {
	jQuery.each( { padding: "inner" + name, content: type, "": "outer" + name }, function( defaultExtra, funcName ) {
		// margin is only for outerHeight, outerWidth
		jQuery.fn[ funcName ] = function( margin, value ) {
			var chainable = arguments.length && ( defaultExtra || typeof margin !== "boolean" ),
				extra = defaultExtra || ( margin === true || value === true ? "margin" : "border" );

			return jQuery.access( this, function( elem, type, value ) {
				var doc;
				//是window就得到可视区的宽高
				if ( jQuery.isWindow( elem ) ) {
					// As of 5/8/2012 this will yield incorrect results for Mobile Safari, but there
					// isn't a whole lot we can do. See pull request at this URL for discussion:
					// https://github.com/jquery/jquery/pull/764
					return elem.document.documentElement[ "client" + name ];
				}

				//是document就得到页面的宽高
				if ( elem.nodeType === 9 ) {
					doc = elem.documentElement;

					// Either scroll[Width/Height] or offset[Width/Height] or client[Width/Height],
					// whichever is greatest
					return Math.max(
						elem.body[ "scroll" + name ], doc[ "scroll" + name ],
						elem.body[ "offset" + name ], doc[ "offset" + name ],
						doc[ "client" + name ]
					);
				}

				return value === undefined ?
					jQuery.css( elem, type, extra ) ://css方式获取

					jQuery.style( elem, type, value, extra );//style方式获取
			}, type, chainable ? margin : undefined, chainable, null );
		};
	});
});
// Limit scope pollution from any deprecated API
// (function() {

// The number of elements contained in the matched element set
jQuery.fn.size = function() {
	return this.length;
};

jQuery.fn.andSelf = jQuery.fn.addBack;

// })();
if ( typeof module === "object" && module && typeof module.exports === "object" ) {
	// Expose jQuery as module.exports in loaders that implement the Node
	// module pattern (including browserify). Do not create the global, since
	// the user will be storing it themselves locally, and globals are frowned
	// upon in the Node module world.
	module.exports = jQuery;
} else {
	// Register as a named AMD module, since jQuery can be concatenated with other
	// files that may use define, but not via a proper concatenation script that
	// understands anonymous AMD modules. A named AMD is safest and most robust
	// way to register. Lowercase jquery is used because AMD module names are
	// derived from file names, and jQuery is normally delivered in a lowercase
	// file name. Do this after creating the global so that if an AMD module wants
	// to call noConflict to hide this version of jQuery, it will work.
	if ( typeof define === "function" && define.amd ) {
		define( "jquery", [], function () { return jQuery; } );
	}
}

// If there is a window object, that at least has a document property,
// define jQuery and $ identifiers
if ( typeof window === "object" && typeof window.document === "object" ) {
	window.jQuery = window.$ = jQuery;
}

})( window );