只用css 实现下拉导航栏
主要用的知识是css中的hover伪类，当鼠标放停在父导航栏上的li元素时候，我们就修改子菜单下面的ul的display属性，这样就可以实现hover的效果了。
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Drop Down Navigation with CSS Only</title>
<style>
body, div, ul, li { margin: 0; padding: 0; }
#header {
min-width: 800px;
height: 150px;
}
#nav {
width: 100%;
background-color: green;
float: left;
}
#nav li {
list-style: none;
float: left;
width: 120px;
height: 30px;
line-height: 30px;
text-align: center;
}
#nav li a {
color: white;
text-decoration: none;
display: block;
}
#nav li a:hover {
background-color: #066;
}
#nav li ul {
position: absolute;
display: none;
}
#nav li:hover ul {
display: block;
}
#nav li ul li {
float: none;
display: inline;
}
#nav li ul li a {
width: 118px;
position: relative;
border-left: 1px solid black;
border-right: 1px solid black;
border-bottom: 1px solid black;
background: green;
color: #fff;
}
#nav li ul li a:hover {
background: #066;
color: #000;
}
</style>
<!--[if lte IE 6]>
<style>
body {behavior: url("csshover3.htc");}
</style>
<![endif]-->
</head>
<body id="about">
<div id="header">
<ul id="nav">
<li class="home"><a href="#">Home</a></li>
<li class="tutorials"><a href="#">Tutorials</a>
<ul>
<li><a href="#">Sub Menu 1</a></li>
<li><a href="#">Sub Menu 2</a></li>
<li><a href="#">Sub Menu 3</a></li>
</ul>
</li>
</ul><!-- nav -->
</div><!-- header -->
</body>
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