网上搜来的，看样子不错，记一笔。//------------------------------------ // heavily based on the Quirksmode addEvent contest winner, John Resig // addEvent function addEvent(obj,type,fn){     if(obj.addEventListener) obj.addEventListener(type,fn,false);     else if(obj.attachEvent){         obj["e"+type+fn]=fn;         obj[type+fn]=function(){obj["e"+type+fn](window.event);}         obj.attachEvent("on"+type,obj[type+fn]);     } } //------------------------------------ // removeEvent function removeEvent(obj,type,fn){   if(obj.removeEventListener) obj.removeEventListener(type,fn,false);   else if(obj.detachEvent){     obj.detachEvent("on"+type,obj[type+fn]);     obj[type+fn]=null;     obj["e"+type+fn]=null;   } }