这是一款使用了jQuery实现的二级菜单特效，灰色风格，颜色自己不喜欢的就自己动动手吧，CSS代码经过了优化，水平高的自己拿出修改吧，这是一个在国外前端设计网站找到的导航菜单效果，希望大家喜欢。
运行效果截图如下：
在线演示地址如下：
具体代码如下：
<!DOCTYPE html> <head> <title>jquery平滑二级下拉菜单</title> <style> h1, h2, h3, h4, p, li, li a{font-family: Arial, Sans-Serif;font-size: 15px;font-weight: bold;color: #525252;text-decoration: none;} h1, h2, h3, h4{font-size: 22px;} #dropdown_nav{width: 960px;padding: 0px;display: inline-block;list-style: none;-moz-box-shadow: inset 0px 0px 1px #fff;-webkit-box-shadow: inset 0px 0px 1px #fff;border: 1px solid #ccc;-moz-border-radius: 5px;-webkit-border-radius: 5px;background: #e2e2e2;background: -moz-linear-gradient(#f3f3f3, #e2e2e2);background: -webkit-gradient(linear, 0 0, 0 100%, from(#f3f3f3), to(#e2e2e2));} #dropdown_nav li{padding: 10px 0px 10px 0px;float: left;position: relative;display: inline-block;} #dropdown_nav li a{padding: 10px 15px 10px 15px;text-shadow: -1px 1px 0px #f6f6f6;-moz-box-shadow: inset 0px 0px 1px #fff;-webkit-box-shadow: inset 0px 0px 1px #fff;border-right: 1px solid #ccc;} #dropdown_nav li a: hover{background: #f9f9f9;background: -moz-linear-gradient(#f9f9f9, #e8e8e8);background: -webkit-gradient(linear, 0 0, 0 100%, from(#f9f9f9), to(#e8e8e8));} #dropdown_nav li a: active{background: #e2e2e2;background: -moz-linear-gradient(#e2e2e2, #f3f3f3);background: -webkit-gradient(linear, 0 0, 0 100%, from(#e2e2e2), to(#f3f3f3));} #dropdown_nav li a.first{-moz-border-radius: 5px 0px 0px 5px;-webkit-border-radius: 5px 0px 0px 5px;} #dropdown_nav .sub_nav{width: 160px;padding: 0px;position: absolute;top: 38px;left: 0px;border: 1px solid #ccc;background: #e2e2e2;} #dropdown_nav .sub_nav li{width: 160px;padding: 0px;} #dropdown_nav .sub_nav li a{display: block;border-bottom: 1px solid #ccc;background: -moz-linear-gradient(#f3f3f3, #e2e2e2);background: -webkit-gradient(linear, 0 0, 0 100%, from(#f3f3f3), to(#e2e2e2));} #dropdown_nav .sub_nav li a: hover{background: #f9f9f9;background: -moz-linear-gradient(#f9f9f9, #e8e8e8);background: -webkit-gradient(linear, 0 0, 0 100%, from(#f9f9f9), to(#e8e8e8));} #dropdown_nav .sub_nav li a: active{background: #e2e2e2;background: -moz-linear-gradient(#e2e2e2, #f3f3f3);background: -webkit-gradient(linear, 0 0, 0 100%, from(#e2e2e2), to(#f3f3f3));} </style> <script type="text/javascript" src="https://www.jb51.net/jquery-1.6.2.min.js"></script> <script type="text/javascript"> $(function() { //We initially hide the all dropdown menus $('#dropdown_nav li').find('.sub_nav').hide(); //When hovering over the main nav link we find the dropdown menu to the corresponding link. $('#dropdown_nav li').hover(function() { //Find a child of 'this' with a class of .sub_nav and make the beauty fadeIn. $(this).find('.sub_nav').fadeIn(100); }, function() { //Do the same again, only fadeOut this time. $(this).find('.sub_nav').fadeOut(50); }); }); </script> </head> <body> <h2>Creating an Awesome Drop-Down Nav with CSS3 & jQuery</h2> <ul> <li><a href="#">Home</a></li> <li><a href="#">ASP源码下载</a> <ul> <li><a href="#">新闻类</a></li> <li><a href="#">论坛类</a></li> <li><a href="#">企业类</a></li> </ul> </li> <li><a href="#">技术文章</a> <ul> <li><a href="#">ASP</a></li> <li><a href="#">php</a></li> <li><a href="#">jquery</a></li> <li><a href="#">Ajax</a></li> </ul> </li> <li><a href="#">Freebies</a> </li> <li><a href="#">网页特效</a> <ul> <li><a href="#">导航菜单</a></li> <li><a href="#">CSS布局</a></li> <li><a href="#">鼠标特效</a></li> </ul> </li> </ul><br /> </body> </html>