Js事件处理程序跨浏览器

 1 var EventUtil={
 2     addHandler:function(element,type,handler){
 3         if(element.addEventListener){
 4             element.addEventListener(type,handler,false);
 5         }else if(element.attachEvent){
 6             element.attachEvent("on"+type,handler);
 7         }else {
 8             element["on"+type]=handler;
 9         }
10     },
11     removeHandler:function(element,type,handler){
12         if(element.removeEventListener){
13             element.removeEventListener(type,handler,false);
14         }else if(element.detachEvent){
15             element.detachEvent("on"+type,handler);
16         }else{
17             element["on"+type];
18         }
19     },
20     getEvent:function(event){
21         return event?event:window.event ;
22     },
23     getTarget:function(event){
24         return event.target||event.srcElement ;
25     },
26     preventDefault:function(event){
27         if(event.preventDefault){
28             event.preventDefault();
29         }else {
30             event.returnValue =null;
31         }
32     },
33     atopPropagation:function(event){
34         if(event.atopPropagation){
35             event.atopPropagation();
36         }else {
37             event.cancelBubble =true;
38         }
39     }
40 };