我的按钮3没反应，求解答
<html>
<head>
<title>事件流</title>
<meta charset="utf-8">
<script>
var btn3=document.getElementById('btn3');
var btn2=document.getElementById('btn2');
function showMes(){
alert('hello world!');
}
var eventUtil={
// 添加句柄
addHandler:function(element,type,handler){
if(element.addEventListener){
element.addEventListener(type,handler,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(type,handler,false);
}else if(element.detachEvent){
element.detachEvent('on'+type,handler);
}else{
element['on'+type]=null;
}
}
}
eventUtil.addHandler(btn3,'click',showMes());
</script>
</head>
<body>
<div id="box">
<input type="button" value="按钮" id="btn" onclick="showMes()">
<input type="button" value="按钮2" id="btn2">
<input type="button" value="按钮3" id="btn3">
</div>
</body>
</head>
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相关分类
JavaScript