Js事件对象EventUtil

 1 var EventUtil = {
 2     getEvent: function(event){       //获取事件对象
 3         return event ? event : window.event;
 4     },
 5     addHandler: function(element, type, handler){ //绑定事件
 6         if (element.addEventListener) {
 7                 element.addEventListener(type, handler, false);
 8         } else if (element.attachEvent) {
 9                 element.attachEvent("on" + type, handler);
10         } else {
11                 element["on" + type] = handler;
12
13         }
14     },
15     removeHandler: function(element, type, handler){   //移除绑定
16         if(element.removeEventListener){
17             element.removeEventListener(type,handler,false);
18         }else if(element.detachEvent){
19             element.detachEvent("on"+type,handler,false);
20         }else{
21             element["on"+type] = null;
22         }
23     },
24     preventDefault: function(event){   //阻止默认事件
25         if(event.preventDefault){
26             event.preventDefault();
27         }else{
28             event.returnValue = false;
29         }
30     },
31     stopPropagation: function(event){   //阻止事件冒泡
32         if (event.stopPropagation) {
33             event.stopPropagation();
34         }else{
35             event.cancelBubble = true;
36         }
37     },
38     getRelateTarget: function(event){ //事件相关元素的信息
39         if(event.relatedTarget){
40             return event.relatedTarget;
41         }else if(event.toElement){
42             event.toElement;
43         }else if(event.fromElement){
44             return event.fromElement;
45         }else{
46             return null;
47         }
48     },
49     getButton: function(event){  //检测button属性
50         if(document.implementation.hasFeature("MouseEvents","2.0")){
51             return event.button;
52         }else{
53             switch(event.button){
54                 case 0:
55                 case 1:
56                 case 3:
57                 case 5:
58                 case 7:
59                         return 0;//主鼠标按钮
60                 case 2:
61                 case 6:
62                         return 2;//次鼠标按钮
63                 case 4:
64                         return 1;//鼠标滚轮按钮
65             }
66         }
67     },
68     getWheelDelta: function(event){//鼠标滚动属性值
69         if(event.wheelDelta){
70             return (client.engine.opera && client.engine.opera <9.5  ? -event.wheelDelta:event.wheelDelta)
71         }else{
72             return -event.detail *40;
73         }
74     },
75     getCharCode: function(event){//获取字符编码
76         if(typeof event.charCode == "number"){
77             return event.charCode;
78         }else{
79             return event.keyCode;
80         }
81     },
82     getCilpboardText: function(event){//获取剪切板内容
83         var cilpboardData = (event.clipboardData || window.clipboardData);
84         return clipboardData.getData("text");
85     },
86     setClipboardText:function(event,value){//剪切到剪切板
87         if(event.clipboardData){
88             return event.clipboardData.setData("text/plain",value);
89         }else if(window.clipboardData){
90             return window.clipboardData.setData("text",value);
91         }
92     }
93
94
95 }

代码总结于《JavaScript高级程序设计》事件章节。

Js事件对象EventUtil