<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>事件处理程序</title>
</head>
<body>
<div class="box">
<input type="button" value="按钮1" id="btn1" onclick="showMes()"/>
<input type="button" value="按钮2" id="btn2" />
<input type="button" value="按钮3" id="btn3" />
</div>
<script>
function showMes(){
alert('hello,world!')
}
var btn2 = document.getElementById("btn2");
var btn3 = document.getElementById("btn3");
btn2.onclick = function(){
alert('这是用DOM0级添加的事件');
}
btn2.onclick = null;
/*btn3.addEventListener('click',showMes,false);
btn3.addEventListener('click',function(){
alert(this.value);
},false);
//btn3.removeEventListener('click',showMes,false);*/
//跨浏览器事件处理程序
var eventUtil = {
//添加句柄
addHandler:function(element,type,handler){
if(element.addEventListener){
element.addEventListener(element,type,false);
}else if(element.attachEvent){
element.attachEvent("on"+type,handler);
}else{
element["on"+type]=handler;
}
},
//删除句柄
removeHandler:function(element,type,handler){
if(element.removeEventListener){
element.removeEventListener(element,type,false);
}else if(element.detachEvent){
element.detachEvent("on"+type,handler);
}else{
element["on"+type] = null;
}
}
}
eventUtil.addHandler(btn3,'click',showMes);
</script>
</body>
</html>
恩...因为你的DOM2写错了，
是element.addEventListener(type,handler,false);
不是你写的element.addEventListener(element,type,false);