求帮我看看哪里错了，谷歌火狐nodename值返回undefined
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="button" id="btn1" value="确定" name="按钮1">
</body>
<script type="text/javascript">
function showMes(event){
alert(event.target.nodename)
}
var btn1=document.getElementById("btn1");
var eventUtil={
//添加句柄
addHandler:function(element,type,handler){
if(element.addEventlistner){
element.addEventlistner(type,handler,false);
}else if(element.attachEvent){
element.attachEvent("on"+type,handler);
}else{
element["on"+type]=handler;
}
}
}
eventUtil.addHandler(btn1,"click",showMes)
</script>
</html>谷歌火狐nodename值返回undefined
