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符合web标准的网页下拉菜单
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<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>css菜单演示</title>
<style type="text/css"> *{margin:0;padding:0;border:0;}
body {
font-family: arial, 宋体, serif;
font-size:12px;
}
#nav {
text-align:center;
line-height:24px;list-style-type:none;background:#666;
margin-left:30px;
} #nav a {
display: block; width: 80px; text-align:center;
} #nav a:link {
color:#666666; text-decoration:none;
}
#nav a:visited {
color:#666;text-decoration:none;
}
#nav a:hover {
color:#CCCCCC;text-decoration:none;font-weight:bold;
} #nav li {
float: left; width: 80px; background:#00FFFF;
}
#nav li a:hover{
background:#999;
}
#nav li ul {
line-height:27px;list-style-type:none;text-align:left;
left:-999em;width:80px; position: absolute;
margin-left:-40px;
}
#nav li ul li{
float:left;width:80px;background: #F6F6F6;
}
#nav li ul a{
display:block;width:80px;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:#ccc;
} #nav li:hover ul {
left: auto;
}
#nav li.sfhover ul {
left: auto;
}
#content {
clear: left;
} </style> <script type=text/javascript>
function menuFix() {
var elems = document.getElementById("nav").getElementsByTagName("li");
for (var i=0; i<elems.length; i++) {
elems[i].onmouseover = function() {
this.className += (this.className.length>0? " ": "") + "sfhover";
}
elems[i].onMouseDown = function() {
this.className += (this.className.length>0? " ": "") + "sfhover";
}
elems[i].onMouseUp = function() {
this.className += (this.className.length>0? " ": "") + "sfhover";
}
elems[i].onmouseout = function() {
this.className = this.className.replace(new RegExp("( ?|^)sfhover\\b"),"");
}
}
}
window.onload=menuFix;
</script> </head>
<body>
<ul id="nav">
<li><a href="#">下拉菜单</a>
<ul>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
</ul>
</li>
<li><a href="#">下拉菜单</a>
<ul>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
<li><a href="#">下拉菜单</a></li>
</ul>
</li>
</ul>
</body>
</html>
