今天就跟大家聊聊有关css中怎么实现一个三级下拉菜单，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
<!DOCTYPE html>
<html>
<head>
<title>test</title>
<style type = "text/css">
*{
margin:0;
padding:0;
}
body{
font-size:12px;
}
ul{
list-style:none;
}
a{
text-decoration:none;
}</p>
<p>
.nav {
width:500px;
height:30px;
background-color:#b4b4b4;
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>
.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>
.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>
<div 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>
</div>
</body>
</html>看完上述内容，你们对css中怎么实现一个三级下拉菜单有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注编程网行业资讯频道，感谢大家的支持。
