jquery实现导航固定顶部的效果，仿蘑菇街的，感觉还不错，需要的朋友可以参考下
<!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="js/jquery-1.4.2.min.js"></script><script type="text/javascript">$(document).ready(function(){var headHeight=$(".header").height()+10;var nav=$(".nav");$(window).scroll(function(){if($(this).scrollTop()>headHeight){nav.addClass("navFix");}else{nav.removeClass("navFix");}})})</script><style type="text/css">*{ margin:0; padding:0;}body{ _background-attachment:fixed; _background-image:url(about:blank);} //实现ie6不支持fixed方法.header{ width:1000px; height:60px; margin:0 auto; text-align:center;}.nav{ border:1px solid #ccc; border-radius:5px; overflow:hidden; height:30px; width:1000px; margin:10px auto; background:#fff;}.nav li{ float:left; padding:0 10px; height:30px; line-height:30px;}.nav li a{ text-decoration:none; color:#0CF;}.nav li a:hover{ color:#000; text-decoration:underline;}.nav ul{ list-style:none;}.navFix{ position:fixed; left:0; top:0; _position:absolute; top:expression((offsetParent.scrollTop)+0); z-index:2;} //实现ie6不支持fixed方法.content{ width:1000px; margin:10px auto;}</style></head><body><div class="header"><h1>导航固定在页面顶部测试</h1></div><div class="nav"><ul><li><a href="">首页</a></li><li><a href="">蓝枫前端</a></li><li><a href="">蓝枫前端</a></li><li><a href="">蓝枫前端</a></li><li><a href="">蓝枫前端</a></li><li><a href="">蓝枫前端</a></li><li><a href="">蓝枫前端</a></li><li><a href="">蓝枫前端</a></li></ul></div><div class="content"><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p><p>11111</p></div></body></html>新闻热点
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