原生js 通用事件绑定

 1 /*原文地址：http://ejohn.org/blog/flexible-javascript-events/*/
　　　　http://blog.csdn.net/qi1271199790/article/details/53458043

 2     /**
 3      * [addEvent &&removeEvent description]
 4      * @param {[obj]}   obj  [绑定事件的对象]
 5      * @param {str}   type [绑定的事件的名称]
 6      * @param {Function} fn   [事件触发的回调函数]
 7      */
 8     var txt=document.getElementById('txt');
 9     function addEvent(obj,type,fn){
10         if(obj.attachEvent){
11             obj['e'+type+fn] = fn;
12             obj[type+fn] = function(){
13                 obj['e'+type+fn](window.event);
14             };
15             obj.attachEvent('on'+type,obj[type+fn]);
16         }else{
17             obj.addEventListener(type,fn,false);
18         }
19     }
20     function removeEvent(obj,type,fn){
21         if(obj.detachEvent()){
22             obj.detachEvent('on'+type,obj[type+fn]);
23             obj[type+fn] = null;
24         }else{
25             obj.removeEventListener(type,fn,false);
26         }
27     }