<!doctype html> <html> <head> <meta charset="utf-8"> <title>首页</title> <style> *{ margin:0; padding:0; list-style:none;} img{ border:0;} .header{ width:100%; background:#11192c;} .logo a img{float: left;} .nav{ width:1000px; margin:0 auto; overflow:hidden;} .nav ul{float: right;} .nav ul li{ height:40px; line-height:40px; float: left; padding:10px 10px; margin:0px 5px;position:relative;} .nav ul li a{ color:#8f8f8f; font-family:'Microsoft Yahei'; font-size:17px; text-decoration:none;} .nav ul li a:hover{ color:#ffffff; text-decoration:none;} .nav ul li span{ display:block; position:absolute; width:0px; height:0px; background:#ffffff; top:58px; left:50%;} </style> </head> <body> <!-- 代码begin --> <div class="header"> <div class="logo"> <a href="index.html"> <img src="https://www.mbkfw.com/static/image/lazy.gif" class="lazy" original=""images/logo.png"" alt=""></a> </div> <div class="nav"> <ul> <li><a href='#'>首页</a><span></span></li> <li><a href='#'>首页</a><span></span></li> <li><a href='#'>首页</a><span></span></li> <li><a href='#'>首页</a><span></span></li> <li><a href='#'>首页</a><span></span></li> <li><a href='#'>首页</a><span></span></li> </ul> </div> </div> <script src="js/jquery.min.js"></script> <script> $(function(){ $('.nav li').hover(function(){ $('span',this).stop().css('height','2px'); $('span',this).animate({ left:'0', width:'100%', right:'0' },200); },function(){ $('span',this).stop().animate({ left:'50%', width:'0' },200); }); }); </script> <!-- 代码end --> </body> </html>