自己封装jquery的一些方法 链式调用模式

function getIndex(ele){

var parent=ele.parentNode;
var brothers=parent.children;

for(var i=0,len=brothers.length;i<len;i++){

if(ele==brothers[i]){

return i;

}

}

}

function falseArrToTrue(arr){

return Array.prototype.slice.call(arr);
}

function getElementsByClassName(obj,name){

var obj = obj || window.document;
var els=obj.getElementsByTagName("*");
var arr=[];

for(var i=0,len=els.length;i<len;i++){

if(els[i].className==name){

arr.push(els[i]);
}

}

return arr;
}

function addEvent(obj,type,fn){

if(obj.attachEvent){

obj.attachEvent("on"+type,function(event){

if(false==fn.call(obj)){

var event=event || window.event;
event.cancelBubble=true;
return false;

}

});
}

else if(obj.addEventListener){

obj.addEventListener(type,function(event){

if(false==fn()){

event.preventDefault();
event.cancelBubble=true;

}

},false);

}

}

function getStyle(obj,style){

return window.getComputedStyle ? window.getComputedStyle(obj,null)[style]:obj.currentStyle[style];

}

function Vjquery(arg){

this.elements=[];

switch(typeof arg){

case "string":

switch(arg.charAt(0)){

case "#":
var el=document.getElementById(arg.substring(1));
this.elements.push(el);
break;
case ".":
this.elements=getElementsByClassName(document,arg.substring(1));
break;
default:

this.elements=document.getElementsByTagName(arg);

}
break;

case "function":

addEvent(window,"load",arg);
break;

case "object":
this.elements.push(arg);
break;

}

}

Vjquery.prototype={

extend:function(key,value){

Vjquery.prototype[key]=value;

},

eq:function(n){

return $(this.elements[n]);

},

each:function(fn){

for(var i=0,len=this.elements.length;i<len;i++)

fn(i,this.elements[i]);

},

find:function(arg){

var res=[];
for(var i=0,len=this.elements.length;i<len;i++){

switch(arg.charAt(0)){

case "." :

var arr=getElementsByClassName(this.elements[i],arg.substring(1));
res=res.concat(arr);

var vqueryObj=new Vjquery();
vqueryObj.elements=res;
return vqueryObj;
break;

default :

var arr=falseArrToTrue(this.elements[i].getElementsByTagName(arg));
res=res.concat(arr);

var vqueryObj=new Vjquery();
vqueryObj.elements=res;
return vqueryObj;

}

}

},

index:function(){

return getIndex(this.elements.slice(-1)[0]);

},

click:function(fn){

for(var i=0,len=this.elements.length;i<len;i++){

addEvent(this.elements[i],"click",fn);

}

return this;

},

size:function(){

return this.elements.length;
},

bind:function(type,fn){

for(var i=0,len=this.elements.length;i<len;i++){

addEvent(this.elements[i],type,fn);

}

return this;

},

show:function(){

for(var i=0,len=this.elements.length;i<len;i++){

if(this.elements[i].nodeType==1){

this.elements[i].style.display="block";

}

}

return this;
},

hide:function(){

for(var i=0,len=this.elements.length;i<len;i++){

if(this.elements[i].nodeType==1){

this.elements[i].style.display="none";

}

}

return this;

},

toggle:function(f1,f2){

var _arguments=arguments;
var length=_arguments.length;
var index=0;

console.log(index);

this.click(function(){

_arguments[index]();
index=(++index)%length;

});

return this;

},

hover:function(overfn,outfn){

for(var i=0,len=this.elements.length;i<len;i++){

if(this.elements[i].nodeType==1){

addEvent(this.elements[i],"mouseover",overfn);
addEvent(this.elements[i],"mouseout",outfn);

}

}

return this;

},

css:function(name,value){ //参数有可能是json

if(typeof name=="string"){

for(var i=0,len=this.elements.length;i<len;i++){

if(this.elements[i].nodeType==1){

if(arguments.length==2){

this.elements[i].style[name]=value;
}

else if(arguments.length==1){

return getStyle(this.elements[0],name);
}

}
}

}

else if(typeof name=="object"){

for(var i=0,len=this.elements.length;i<len;i++){

for(var key in name ){

this.elements[i].style[key]=name[key];

}

}

}

return this;

},

attr:function(arg){

for(var i=0,len=this.elements.length;i<len;i++){

if(this.elements[i].nodeType==1){

if(arguments.length==2){

this.elements[i].setAttribute([arguments[0]],arguments[1]);
}

else if(arguments.length==1){

this.elements[i].getAttribute([arguments[0]]);
}

}

}

return this;

}

}

function $(str){

return new Vjquery(str);
}