<!DOCTYPE?html>
<html>
<head>
<title>DOM事件探秘</title>
<meta?charset="utf-8">
</head>
<body>
<input?type="button"?id="btn"?onclick="getMessage()"?value="btn1">
<input?type="button"?id="btn2"?value="btn2">
<input?type="button"?id="btn3"?value="btn3">
<script?type="text/javascript">
function?getMessage(){
alert("hello!");
}
var?btn2=document.getElementById('btn2');
btn2.onclick=function(){
alert("這是通過(guò)DOM0級(jí)調(diào)用的程序！");
}
btn2.onclick=null;\\取消按鈕的作用
var?btn3=document.getElementById('btn3');
btn3.addEventListener('click',getMessage,false);
</script>
</body>
</html>
2017-05-09
你的注釋符號(hào)打錯(cuò)了，btn2.onclick=null;\\取消按鈕的作用；應(yīng)該 //