上面是一个效果图，代码在下面：
html
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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