1 <head>
2 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
3 <title>无标题文档</title>
4 <style type="text/css">
5 *{margin:0px auto; padding:0px;}
6 #tou{width:100%; height:200px; background-color:#06C;}
7 #menu{width:100%; height:80px; background-color:#666;}
8 #neirong{width:100%; height:2000px;}
9 </style>
10 </head>
11
12 <body>
13 <div id="tou"></div>
14 <div id="menu"></div>
15 <div id="neirong"></div>
16 </body>
17 <script type="text/javascript">
18 window.onscroll =function(){
19 if(window.scrollY>=200){
20 document.getElementById("menu").style.position="fixed";
21 document.getElementById("menu").style.top="0px";
22 }else{
23 document.getElementById("menu").style.position="";
24 }
25 }
26 </script>
27 </html>
