一款只用了css就实现的css 下拉导航菜单效果，有兴趣的朋友可以参考一下。
代码如下
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body {
font: normal .8em/1.5em Arial, Helvetica, sans-serif;
background: #ebebeb;
width: 900px;
margin: 100px auto;
color: #666;
}
a {
color: #333;
}
#nav {
margin: 0;
padding: 7px 6px 0;
background: #7d7d7d url(img/gradient.png) repeat-x 0 -110px;
line-height: 100%;
border-radius: 2em;
-webkit-border-radius: 2em;
-moz-border-radius: 2em;
-webkit-box-shadow: 0 1px 3px rgba(0,0,0, .4);
-moz-box-shadow: 0 1px 3px rgba(0,0,0, .4);
}
#nav li {
margin: 0 5px;
padding: 0 0 8px;
float: left;
position: relative;
list-style: none;
}
/* main level link */
#nav a {
font-weight: bold;
color: #e7e5e5;
text-decoration: none;
display: block;
padding:8px 20px;
margin: 0;
-webkit-border-radius: 1.6em;
-moz-border-radius: 1.6em;
text-shadow: 0 1px 1px rgba(0,0,0, .3);
}
#nav a:hover {
background: #000;
color: #fff;
}
/* main level link hover */
#nav .current a, #nav li:hover > a {
background: #666 url(img/gradient.png) repeat-x 0 -40px;
color: #444;
border-top: solid 1px #f8f8f8;
-webkit-box-shadow: 0 1px 1px rgba(0,0,0, .2);
-moz-box-shadow: 0 1px 1px rgba(0,0,0, .2);
box-shadow: 0 1px 1px rgba(0,0,0, .2);
text-shadow: 0 1px 0 rgba(255,255,255, 1);
}
/* sub levels link hover */
#nav ul li:hover a, #nav li:hover li a {
background: none;
border: none;
color: #666;
-webkit-box-shadow: none;
-moz-box-shadow: none;
}
#nav ul a:hover {
background: #0078ff url(img/gradient.png) repeat-x 0 -100px !important;
color: #fff !important;
-webkit-border-radius: 0;
-moz-border-radius: 0;
text-shadow: 0 1px 1px rgba(0,0,0, .1);
}
/* dropdown */
#nav li:hover > ul {
display: block;
}
/* level 2 list */
#nav ul {
display: none;
margin: 0;
padding: 0;
width: 185px;
position: absolute;
top: 35px;
left: 0;
background: #ddd url(img/gradient.png) repeat-x 0 0;
border: solid 1px #b4b4b4;
-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;
-webkit-box-shadow: 0 1px 3px rgba(0,0,0, .3);
-moz-box-shadow: 0 1px 3px rgba(0,0,0, .3);
box-shadow: 0 1px 3px rgba(0,0,0, .3);
}
#nav ul li {
float: none;
margin: 0;
padding: 0;
}
#nav ul a {
font-weight: normal;
text-shadow: 0 1px 0 #fff;
}
/* level 3+ list */
#nav ul ul {
left: 181px;
top: -3px;
}
/* rounded corners of first and last link */
#nav ul li:first-child > a {
-webkit-border-top-left-radius: 9px;
-moz-border-radius-topleft: 9px;
-webkit-border-top-right-radius: 9px;
-moz-border-radius-topright: 9px;
}
#nav ul li:last-child > a {
-webkit-border-bottom-left-radius: 9px;
-moz-border-radius-bottomleft: 9px;
-webkit-border-bottom-right-radius: 9px;
-moz-border-radius-bottomright: 9px;
}
/* clearfix */
#nav:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
#nav {
display: inline-block;
}
html[xmlns] #nav {
display: block;
}
* html #nav {
height: 1%;
}
html
代码如下
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>CSS3 Dropdown Menu</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<ul id="nav">
<li class="current"><a href="http://w">Home</a></li>
<li><a href="#">My Projects</a>
<ul>
<li><a href="">N.Design Studio</a>
<ul>
<li><a href="#/portfolio">Portfolio</a></li>
<li><a href="#/wp-themes">WordPress Themes</a></li>
<li><a href="#/wallpapers">Wallpapers</a></li>
<li><a href="#/tutorials">Illustrator Tutorials</a></li>
</ul>
</li>
<li><a href="http://www.webdesignerwall.com">Web Designer Wall</a>
<ul>
<li><a href="http://jobs.webdesignerwall.com">Design Job Wall</a></li>
</ul>
</li>
<li><a href="http://icondock.com">IconDock</a></li>
<li><a href="h#">Best Web Gallery</a></li>
</ul>
</li>
<li><a href="#">Multi-Levels</a>
<ul>
<li><a href="#">Team</a>
<ul>
<li><a href="#">Sub-Level Item</a></li>
<li><a href="#">Sub-Level Item</a>
<ul>
<li><a href="#">Sub-Level Item</a></li>
<li><a href="#">Sub-Level Item</a></li>
<li><a href="#">Sub-Level Item</a></li>
</ul>
</li>
<li><a href="#">Sub-Level Item</a></li>
</ul>
</li>
<li><a href="#">Sales</a></li>
<li><a href="#">Another Link</a></li>
<li><a href="#">Department</a>
<ul>
<li><a href="#">Sub-Level Item</a></li>
<li><a href="#">Sub-Level Item</a></li>
<li><a href="#">Sub-Level Item</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">About</a></li>
<li><a href="#">Contact Us</a></li>
</ul>
</body>
</html>
