运行效果截图如下：
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <script type="text/javascript" src="https://www.jb51.net/jquery-1.7.2.min.js" ></script> <script type="text/javascript"> $(function(){ $("#wrap ul li ").css("width",760 / $("#wrap ul li").size()); $(window).scroll(function(){ var h = $(this).scrollTop()+2; $("#wrap").css("top",h); }); $("#wrap ul li:even").css("background","#ddd") $("#wrap ul li").hover(function(){$(this).css("background","#0f0");},function(){$(this).css("background","");}); }); </script> <style type="text/css"> #wrap{position:absolute; top:2px; left:0px; width:100%; height:20px; background:#f00;} #wrap ul{list-style:none; width:760px; margin:0 auto; padding:0; background:#fff;} #wrap ul li{float: left; text-align:center;} #test{height:2000px; background:#f0f; margin:0; padding:0; border:1px solid black;} </style> </head> <body> <div> <ul> <Li>首页</Li> <li>图片</li> <li>新闻</li> <li>软件</li> <li>图片</li> <li>新闻</li> <li>软件</li> <li>图片</li> <li>新闻</li> <li>软件</li> </ul> </div><div></div> </body> </html>