大家重点看一下JS语句。报错是Uncaught TypeError: Cannot read property 'style' of undefined。但是我要是用onclick来触发确是可以得，好奇怪啊！<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
*{margin:0;
padding:0;
font-size:13px;
list-style:none;}
.menu{width:210px;
margin:50px auto;
border:1px solid #ccc;}
.menu p{height:25px;
line-height:25px;
font-weight:bold;
background:#eee;
border-bottom:1px solid #ccc;
cursor:pointer;
padding-left:5px;}
.menu div ul{display:none;}
.menu li{height:24px;
line-height:24px;
padding-left:5px;}
</style>
<script type="text/javascript">
window.onload=function(){
var menu = document.getElementById('menu'),
ps =menu.getElementsByTagName('p'),
uls = menu.getElementsByTagName('ul');
// 将所有点击的标题和要显示隐藏的列表取出来
for(i=0;i<ps.length;i++){
var u=uls[this.id];
ps[i].onmouseover= function(){
if (u.style.display == 'block') {
u.style.display='none';
}
}
ps[i].onmouseout= function() {
if (u.style.display == 'none') {
u.style.display='block';
}
}
}
}
</script>
</head>
<body>
<div id="menu">
<div>
<p id="0">Web前端</p>
<ul style="display:block">
<li>JavaScript</li>
<li>DIV+CSS</li>
<li>jQuery</li>
</ul>
</div>
<div>
<p id="1">后台脚本</p>
<ul>
<li>PHP</li>
<li>ASP.net</li>
<li>JSP</li>
</ul>
</div>
<div>
<p id="2">前端框架</p>
<ul>
<li>Extjs</li>
<li>Esspress</li>
<li>YUI</li>
</ul>
</div>
</div>
</body>
</html>
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