上面是一个效果图，代码在下面：

html

XML/HTML Code

<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>

css:

CSS Code

*{

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);

}