菜单固定导航
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>【推荐】JS+CSS打造随滚动条滑动始终固定在顶部的菜单导航_网页代码站(www.webdm.cn)</title>
<style type="text/css">
*{ margin:0; padding:0;}
.nav-wrapper-fixed{ position:fixed; top:0; width:100%;}
.nav-wrapper-fixed .nav{width:960px; margin:0 auto;}
.nav-wrapper-fixed .nav li{ float:left; width:100px; margin-right:5px; background:#CCC; text-align:center; height:24px; line-height:24px; list-style:none;}
.nav-wrapper{ margin-top:100px; width:100%;}
.nav-wrapper .nav{width:960px; margin:0 auto;}
.nav-wrapper .nav li{ float:left; width:100px; margin-right:5px; background:#CCC; text-align:center; height:24px; line-height:24px; list-style:none;}
</style>
<script type="text/javascript">
window.onload=function(){
var nav=document.getElementById('nav');
var navFixed=document.getElementById('navFixed');
window.onscroll=function(){
var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
document.title=scrollTop
if(scrollTop>nav.offsetTop){
navFixed.style.display='block';
}else if(scrollTop<nav.offsetTop){
navFixed.style.display='none';
}
}
};
</script>
</head>
<body style="height:2000px;">
<div class="nav-wrapper">
<div class="nav" id="nav">
<ul>
<li>菜单一</li>
<li>菜单二</li>
<li>菜单三</li>
<li>菜单四</li>
<li>菜单五</li>
</ul>
</div>
</div>
<div class="nav-wrapper-fixed" id="navFixed" style="display:none;">
<div class="nav" id="nav">
<ul>
<li>菜单一</li>
<li>菜单二</li>
<li>菜单三</li>
<li>菜单四</li>
<li>菜单五</li>
</ul>
</div>
</div>
<br />
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</body>
</html>
