jQuery 获取DOM元素

(function (window){

var arr=[];

var VP=function(selector,context){

return new VP.fn.init(selector,context);

}

VP.fn=VP.prototype={

contstructor:VP,

init:function(selector,context){

var _document=window.document,elem,mark=selector.charAt(0);

if(mark=='#'){

elem =_document.getElementById(selector.substring(1));

if(elem){

this[0]=elem;

this.length=1;

}

}

return this;

},

splice:arr.splice,

};

VP.extend=VP.fn.extend=function(){

var options,name,src,copy,copyIsArray,clone,target=arguments[0]||{},

i=1,

length=arguments.length,

deep=false;

if(typeof target=="boolean"){

deep=target;

target=arguments[i]||{};

i++;

}

if(typeof target !=="object"&&!VP.isFunction(target)){

target={};

}

if(i==length){

target=this;

i--;

}

for(;i<length;i++){

for(name in options){

src=target[name];

copy=options[name];

if(target==copy){

continue;

}

if(deep&&copy&&(VP.isPlainObject(copy)||

(copyIsArray=VP.isArray(copy)))){

if(copyIsArray){

copyIsArray=false;

clone=src && VP.isArray(src)?src:[];

}

else{

clone=src&&VP.isPlainObject(src)?src:{};

}

target[name]=VP.extend(deep,clone,copy);

}

else if(copy !==undefined){

target[name]=copy;

}

}

}

}

return target;

};

VP.fn.extend({

get:function(){

return this[0];

},

});

VP.fn.init.prototye=VP.fn;

window.VP=VP;

})(window);