                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /DOM事件探秘

IE8 IE7 IE6 下不行帮忙看一下

1	`<a href="#"` `id="a1">点击</a>`

var eventUtil = {
        //添加句柄
        addHandler:function(element,type,handler){
            if(element.addEventListener){
                element.addEventListener(type,handler,false);
            }else if(element.detachEvent){
                element.detachEvent('on'+type,handler);
            }else{
                element['on'+type] = handler;
            }
        },
        //删除句柄
        removeHandler:function(element,type,handler){
            if(element.removeEventListener){
                element.removeEventListener(type,handler,false);
            }else if(element.attachEvent){
                element.attachEvent('on'+type,handler);
            }else{
                element['on'+type] = null;
            }
        }
    };
    (function(){
        var oA = document.getElementById("a1");
        function alert1(){
            alert("1")
        }
        eventUtil.addHandler(oA,"click",alert1);
    })();