（二）原生JS实现 - 事件类方法

事件处理 - 添加事件

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 };

事件处理 - 移除事件

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 };

事件处理 - Bind

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 };

使用：

 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 }

事件代理

 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 };

使用：

 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 }