符合WEB標準的div css導航下拉菜單_Div+CSS教程

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符合WEB標準的div css導航下拉菜單。
點擊運行此代碼，查看效果。

代碼調試框 [www.ghpqjb.com]

<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>mb5u.com - css菜單演示</title>
<style type="text/css">
*{margin:0;padding:0;border:0;}
body {
font-family: arial, 宋體, serif;
font-size:12px;
}
#nav {
line-height: 24px; list-style-type: none; background:#666;
}
#nav a {
display: block; width: 80px; text-align:center;
}
#nav a:link {
color:#666; text-decoration:none;
}
#nav a:visited {
color:#666;text-decoration:none;
}
#nav a:hover {
color:#FFF;text-decoration:none;font-weight:bold;
}
#nav li {
float: left; width: 80px; background:#CCC;
}
#nav li a:hover{
background:#999;
}
#nav li ul {
line-height: 27px; list-style-type: none;text-align:left;
left: -999em; width: 180px; position: absolute;
}
#nav li ul li{
float: left; width: 180px;
background: #F6F6F6;
}
#nav li ul a{
display: block; width: 156px;text-align:left;padding-left:24px;
}
#nav li ul a:link {
color:#666; text-decoration:none;
}
#nav li ul a:visited {
color:#666;text-decoration:none;
}
#nav li ul a:hover {
color:#F3F3F3;text-decoration:none;font-weight:normal;
background:#C00;
}
#nav li:hover ul {
left: auto;
}
#nav li.sfhover ul {
left: auto;
}
#content {
clear: left;
}
</style>
<script type=text/javascript>
function menuFix() {
var sfEls = document.getElementById("nav").getElementsByTagName("li");
for (var i=0; i<sfEls.length; i  ) {
sfEls[i].onmouseover=function() {
this.className =(this.className.length>0? " ": "")   "sfhover";
}
sfEls[i].onMouseDown=function() {
this.className =(this.className.length>0? " ": "")   "sfhover";
}
sfEls[i].onMouseUp=function() {
this.className =(this.className.length>0? " ": "")   "sfhover";
}
sfEls[i].onmouseout=function() {
this.className=this.className.replace(new RegExp("( ?|^)sfhover\\b"),

"");
}
}
}
window.onload=menuFix;
//<!]]></script>
</head>
<body>
<ul id="nav">
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">產品介紹
<ul>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">產品一</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">產品一</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">產品一</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">產品一</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">產品一</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">產品一</li>
</ul>
</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">服務介紹
<ul>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">服務二</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">服務二</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">服務二</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">服務二服務二</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">服務二服務二服務二</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">服務二</li>
</ul>
</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">成功案例
<ul>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">案例三</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">案例</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">案例三案例三</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">案例三案例三案例三</li>
</ul>
</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">關于我們
<ul>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">我們四</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">我們四</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">我們四</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">我們四111</li>
</ul>
</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">在線演示
<ul>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示演示演示</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示演示演示</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示演示</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示演示演示</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">演示演示演示演示演示</li>
</ul>
</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系我們
<ul>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系聯系聯系聯系聯系</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系聯系聯系</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系聯系</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系聯系</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系聯系聯系</li>
<li><a href="http://www.ghpqjb.com" _fcksavedurl="http://www.ghpqjb.com">聯系聯系聯系</li>
</ul>
</li>
</ul>
</body>
</html>

[ 可先修改部分代碼再運行查看效果 ]