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css三级下拉菜单实现的方法

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Lepaskan： 2018-06-28 15:11:20

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<!DOCTYPE html>
<html>
<head>
<title>test</title>
<style type = "text/css">
/*设置通配符样式*/ 
*{
 margin:0; 
 padding:0;
}
body{
 font-size:12px;
}
ul{
 list-style:none;
}
a{
 text-decoration:none;
}</p>
<p>/*设置二级导航样式*/ 
.nav {
 width:500px; 
 height:30px;
 background-color:#b4b4b4;
 /*导航栏居中*/
 margin:auto;
}
.nav ul li { 
 width:100px; 
 height:30px; 
 float:left; 
 position:relative;
}
.nav ul li a {
 display:block;
 width:96px; 
 border:2px solid gray; 
 height:26px; 
 line-height:26px; 
 text-align:center;
}
.nav ul li a:hover { 
 background-color:yellow;
}</p>
<p>/*设置一级导航样式*/
.nav ul li ul{
 display:none;
}
.nav ul li:hover ul{
 display:block;
 width:100px;
 position:absolute;
 top:30px;
 left:0;
 background-color:white;
}
.nav ul li:hover ul li a{
 display:block;
 width:96px;
 height:26px;
 line-height:26px;
 border:2px solid gray;
 text-align:center;
}
.nav ul li:hover ul li a:hover{
 background-color:orange;
}</p>
<p>/*设置三级导航样式*/
.nav ul li:hover ul li ul { 
 display:none;
}
.nav ul li:hover ul li:hover ul{ 
 display:block; 
 width:100px; 
 position:absolute; 
 top:0px; 
 left:100px;
 background-color:#b4b4b4;
}
.nav ul li:hover ul li:hover ul li { 
 width:100px; 
 height:30px; 
}
.nav ul li:hover ul li:hover ul li a { 
 display:block; 
 width:96px; 
 height:26px; 
 line-height:26px; 
 border:2px solid gray; 
 text-align:center; 
}
.nav ul li:hover ul li:hover ul li a:hover { 
 background-color:#00CC00;
}
.nav ul li:hover ul .nav_jw ul { 
 display:none;
}
.nav ul li:hover ul .nav_jw:hover ul{ 
 display:block; 
 width:100px; 
 position:absolute; 
 top:0px; 
 left:-100px;
 background-color:#b4b4b4;
}
.nav ul li:hover ul .nav_jw:hover ul li { 
 width:100px; 
 height:30px; 
}
.nav ul li:hover ul .nav_jw:hover ul li a { 
 display:block; 
 width:96px; 
 height:26px; 
 line-height:26px; 
 border:2px solid gray; 
 text-align:center; 
}
.nav ul li:hover ul .nav_jw:hover ul li a:hover { 
 background-color:#00CC00;
}</p>
<p></style>
</head>
<body>
<p class = "nav">
<ul>
<li><a href = "#">一级导航</a>
 <ul>
 <li><a href = "#">二级导航</a>
  <ul>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
  </ul>
 </li>  
 <li><a href = "#">二级导航</a>
  <ul>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
  </ul>
 </li>  
 <li><a href = "#">二级导航</a>
  <ul>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
  </ul>
 </li>  
 </ul>
</li>
<li><a href = "#">一级导航</a>
 <ul>
 <li><a href = "#">二级导航</a></li>  
 <li><a href = "#">二级导航</a></li>  
 <li><a href = "#">二级导航</a></li>  
 </ul>
</li>
<li><a href = "#">一级导航</a>
 <ul>
 <li><a href = "#">二级导航</a></li>  
 <li><a href = "#">二级导航</a></li>  
 <li><a href = "#">二级导航</a></li>  
 </ul>
</li>
<li><a href = "#">一级导航</a>
 <ul>
 <li><a href = "#">二级导航</a></li>  
 <li><a href = "#">二级导航</a></li>  
 <li><a href = "#">二级导航</a></li>  
 </ul>
</li>
<li><a href = "#">一级导航</a>
 <ul>
 <li class="nav_jw"><a href = "#">二级导航</a>
  <ul>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
  </ul>
 </li>  
 <li class="nav_jw"><a href = "#">二级导航</a>
  <ul>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
  </ul>
 </li>  
 <li class="nav_jw"><a href = "#">二级导航</a>
  <ul>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
   <li><a href = "#">三级导航</a></li>
  </ul>
 </li>  
 </ul>
</li>
</ul>
</p>
</body>
</html>

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