var Event = {

         //注册事件

         addEvent: function(element,type,handler){

             if(element.addEventListener){  //DOM2级

                 element.addEventListener(type,handler,false); //false为冒泡，true为捕获

             }else if(element.attachEvent){  //IE

                 element.attachEvent("on"+type,function(){  //默认皆为冒泡

                     handler.call(element);

                 });

             }else{

                 element["on"+type] = handler; //DOM0级

             }

         },

         //取消事件

         removeEvent: function(element,type,handler){

             if(element.removeEventListener){

                 element.removeEventListener(type,handler,false);

             }else if(element.detachEvent){

                 element.detachEvent("on"+type,handler);

             }else{

                 element["on"+type] = null;

             }

         },

         //防止冒泡行为

         stopPropagation: function(event){

             if(event.stopPropagation){ //非IE

                 event.stopPropagation();

             }else{  //IE

                 event.cancleBubble = true;

             }

         },

         //阻止默认行为 如<a>的默认链接行为

         preventDefault: function(event){

             if(event.preventDefault){  //

                 event.preventDefault();

             }else{  //IE

                 event.returnValue = true;

             }

         },

         //获取事件对象

         getEvent: function(event){

             return event || window.event;  //FF通过传过来的参数event使用，IE通过window.event取用

         },

         //获取触发事件的目标源

         getTarget: function(event){

             return event.target || event.srcElement;  //后者为了兼容IE

         }

     };