求高手看看 问题出哪了?
<style type="text/css">
*{margin:0;padding:0;} .addens{width:800px;height:40px;margin:0 auto;background-color:#ccc;} ul{list-style:none;}
ul li{float:left;line-height:40px;text-align:center;position:relative;}a{text-decoration:none; color:#656565;display:inline-block;padding:0 30px;height:40px;}a:hover{color:#fff;background-color:#666;}ul li ul li{float:none; background-color:#eee;margin-top:2px;}
ul li ul{position:absolute;left:0;top:40px; display:none;}
<script>
function show_submenu(li){
var submenu=li.getElementsByTagName("ul")[0];
submenu.style.display="block";
}
function hiden_meces(li){
var ellement=li.getElementsByTagName("ul")[0];
ellement.style.display="none";
}
</script>
</head>
<body>
<div class="addens">
<ul>
<li><a href="#">首页</a></li>
<li onmousemove="show_submenu(this)" onmouseout="hiden_meces(this)"><a href="#">听香水榭</a>
<ul>
<li><a href="#">JAVASCRIPT</a></li>
<li><a href="#">JQUERY</a></li>
<li><a href="#">HTML/CSS</a></li>
</ul>
</li>
</body></html>