頂部通欄-新浪微博效果
JS----------------------------------------
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‘;
}
}
}
CSS------------------------
<style>
*{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>
HTML-----------------------
<body style="height:2000px;">
<div class="nav-wrapper">
<div class="nav" id="nav">
<ul>
<li>菜單一11</li>
<li>菜單二</li>
<li>菜單三</li>
<li>菜單四</li>
<li>菜單五</li>
</ul>
</div>
</div>
<div class="nav-wrapper-fixed" id="navFixed" style="display:none;">
<div class="nav" id="nav">
<ul>
<li>菜單一22</li>
<li>菜單二</li>
<li>菜單三</li>
<li>菜單四</li>
<li>菜單五</li>
</ul>
</div>
</div>
</body>
頂部通欄-新浪微博效果