1 var addEventHandler = function (oTarget, sEventType, fnHandler) {
2     if (oTarget.addEventListener) {
3         oTarget.addEventListener(sEventType, fnHandler, false);
4     } else if (oTarget.attachEvent) {
5         oTarget.attachEvent("on" + sEventType, fnHandler);
6     } else {
7         oTarget["on" + sEventType] = fnHandler;
8     }
9 };

1 var removeEventHandler = function (oTarget, sEventType, fnHandler) {
2     if (oTarget.removeEventListener) {
3         oTarget.removeEventListener(sEventType, fnHandler, false);
4     } else if (oTarget.detachEvent) {
5         oTarget.detachEvent("on" + sEventType, fnHandler);
6     } else {
7         oTarget["on" + sEventType] = null;
8     }
9 };

1 var BindAsEventListener = function(object, fun) {
2     var args = Array.prototype.slice.call(arguments).slice(2);
3     return function(event) {
4         return fun.apply(object, [event || window.event].concat(args));
5     }
6 };

 1 var Test = function(){
 2     this.init();
 3 );
 4 Test.prototype = {
 5     init:function(){
 6         this.name = 'test';
 7         this.btn = document.getElementById('test');
 8         this._fC = BindAsEventListener(this, this._doClick,'bind event');
 9         addEventHandler(this.btn, "click", this._fC );
10     },
11     _doClick:funtion(e,str){
12         e.preventDefault();
13         alert(this.name + ' ' +str);
14     },
15     destory:function(){
16         removeEventHandler(this.btn, "click", this._fC );
17     }
18 }

 1 var Delegate = function (parent,eventType, selector, fn , that){
 2     eventType = eventType || 'click';
 3     if(!parent){
 4         return;
 5     }
 6     if( typeof fn !== 'function'){
 7         return;
 8     }
 9     if( typeof selector !== 'string'){
10         return;
11     }
12     var handle = function (e){
13         var evt = window.event ? window.event : e;
14         var target = evt.target || evt.srcElement;
15         target = getDlgElement(target);
16         if(target){
17             fn.call(that,{target:target,event:e});
18         }
19     };
20     var getDlgElement = function(ele){
21         if(!ele){
22             return null;
23         }
24         return ( (ele.id === selector) ||
25             (ele.className && ele.className.indexOf(selector) != -1)) ? ele : getDlgElement(ele.parentNode);
26     };
27     parent['on' + eventType] = handle;
28 };

 1 var Test2 = function(){
 2     this.init();
 3 };
 4 Test2.prototype = {
 5     init:function(){
 6         var me = this;
 7         Delegate(document,'click','classname',function(e){
 8             e.event.preventDefault();
 9             var obj =  e.target;
10             me.setVaule(obj,'test')
11         },this);
12     },
13     setVaule:function(elem,str){
14         elem.setAttribute('data-value',str);
15     }
16 }