上面是一个效果图，代码在下面：
html
<html><head> <meta charset="utf-8"/> <title>CSS3 实现的导航</title> <link type="text/css" rel="stylesheet" href="nav.css" /> <base target="_blank" href="http://www.ido321.com"></base></head><body> <nav> <ul class="nav-ul"> <li> <a href="/">首页</a> </li> <li> <a href="/category/frontend">Web前端</a> <ul> <li class="nav-effect-1"> <a href="/category/frontend/javascript">JavaScript</a> </li> <li class="nav-effect-2"> <a href="/category/frontend/jq">JQuery</a> </li> <li class="nav-effect-3"> <a href="/category/frontend/style">CSS</a> </li> <li class="nav-effect-4"> <a href="/category/frontend/html">HTML</a> </li> </ul> </li> <li> <a href="/category/end">后端</a> <ul> <li class="nav-effect-1"> <a href="/category/end/python-end">Python</a> </li> <li class="nav-effect-2"> <a href="category/end/php">PHP</a> </li> </ul> </li> <li> <a href="/category/trivial">琐碎杂类</a> <ul> <li class="nav-effect-1"> <a href="/category/trivial/linux">Linux</a> </li> <li class="nav-effect-2"> <a href="/category/trivial/ajax">Ajax</a> </li> </ul> </li> <li> <a href="/category/life">我的生活</a> <ul> <li class="nav-effect-1"> <a href="/category/life/college">College</a> </li> <li class="nav-effect-2"> <a href="/category/life/review">Review</a> </li> <li class="nav-effect-3"> <a href="/category/life/sentiment">Sentiment</a> </li> </ul> </li> <li> <a href="#">关于我</a> <ul> <li class="nav-effect-1"> <a href="/contribute">友情链接</a> </li> <li class="nav-effect-2"> <a href="/message">留言板</a> </li> </ul> </li> </ul> </nav></body></html>
css
*{ margin:0 auto;}body{ background-color: #EEEEEE; font-family: Microsoft Yahei,Arial,sans-serif;}nav{ width: 100%; background-color: #455552; position: relative; width: 650px; margin-top: 100px;}.nav-ul{ list-style: none;}.nav-ul>li{ display: inline-block; position: relative;}.nav-ul a{ text-decoration: none; color: #FFF; display: inline-block; padding: 10px 20px;}.nav-ul a:hover{ background-color: #1ABC9C;}.nav-ul a:hover+ul li{ opacity:1; -webkit-transform: rotateY(0deg); transform: rotateY(0deg);}.nav-ul a+ul{ list-style: none; position: absolute; transition: opacity 0.5s; -webkit-perspective: 800; -webkit-transform-style: preserve-3d;}.nav-ul a+ul:hover li{ opacity: 1; -webkit-transform: rotateY(0deg); transform: rotateY(0deg);}.nav-ul a+ul li{ position: relative; left: -40px; opacity: 0; width: 150px; transition: transform 1.5s,opacity 0.8s;}.nav-ul a+ul a{ display: inline-block; width: 75%; background-color: rgba(26,188, 156, 0.75);}.nav-effect-1{ transform: rotateY(90deg) translateX(10px);}.nav-effect-2{ transform: rotateY(120deg) translateX(20px);}.nav-effect-3{ transform: rotateY(150deg) translateX(30px);}.nav-effect-4{ transform: rotateY(180deg) translateX(40px);}.nav-ul a+ul a:hover{ background-color: rgba(69,85, 82, 0.75);}查看demo：demo
原文出处：http://www.ido321.com/1547.html
