<!-- 思路为，三级菜单直接用三层嵌套的ul布局：? -->
################### 观摩淘宝 ————有感
<DOCTYPE html>
<html>
<head>
<title>三级下拉菜单</title>
<meta charset="utf-8">
<style type="text/css">
body,*{
margin: 0px;
padding: 0px;
font-size: 0px;
color: #555;
box-sizing:border-box;
}
ul{
list-style: none;
}
.banner{
width: 100%;
height: 100px;
}
.nav{
width: 100%;
height: 60px;
border: 0px;
border-top: 1px solid #eee;
border-bottom: 1px solid #eee;
background-color: #fff;
}
.nav>ul{
width: 80%;
margin:0 auto;
}
.nav>ul:after{
display: block;
content: '';
clear: both;
}
.nav>ul>li{
display: block;
width: 140px;
height: 100%;
padding-left: 20px;
float: left;
text-align: center;
background: url(img/bg.gif) no-repeat;
background-position: 21px 22px;
}
.nav>ul>li:hover{
background-color: #fff5f5;
}
.nav>ul>li a{
display: inline-block;
width: 100%;
height: 100%;
padding: 10px 20px;
font-size: 18px;
line-height: 40px;
text-decoration:none;
}
.nav>ul>li ul{
display: none;
}
.nav>ul>li:hover>a+ul{/*鼠标划过一级菜单的时候二级菜单显示*/
display: block;
}
.nav>ul>li>ul{
width: 160px;
height: auto;
border: 1px solid #eee;
border-radius:3px;
position: relative;
top: 0px;
left: -20px;
}
.nav>ul>li>ul>li,.nav>ul>li>ul>li>ul>li{
display: block;
width: 100%;
height: 60px;
text-align: center;
border-bottom: 1px solid #eee;
}
.nav>ul>li>ul>li:last-child,.nav>ul>li>ul>li>ul>li:last-child{
border: 0px;
}
.nav>ul>li>ul>li:hover,.nav>ul>li>ul>li>ul>li:hover{/*与用户的交互不能少*/
background: #fff9f9;
}
.nav>ul>li>ul>li:hover ul{/*鼠标划过二级菜单的时候对应的三级菜单显示*/
display: block;
}
.nav>ul>li>ul>li>ul{
width: 160px;
height: auto;
border: 1px solid #eee;
border-radius:3px;
position: relative;
top: -60px;
left: 100%;
}
</style>
</head>
<body>
<div class="banner"></div>
<div class="nav">
<ul>
<li>
<a href="#">电器</a>
<ul>
<li>
<a href="#">家用电器</a>
<ul>
<li><a href="#a" target="_self">生活电器</a></li>
<li><a href="#a" target="_self">生活电器</a></li>
<li><a href="#a" target="_self">个人护理</a></li>
</ul>
</li>
<li>
<a href="#">数码</a>
<ul>
<li><a href="#a" target="_self">平板电脑</a></li>
<li><a href="#a" target="_self">数码相机</a></li>
<li><a href="#a" target="_self">电玩动漫</a></li>
</ul>
</li>
<li>
<a href="#">手机</a>
</li>
</ul>
</li>
<li>
<a href="#">服饰</a>
<ul>
<li>
<a href="#">男装</a>
<ul>
<li><a href="#a" target="_self">商务男装</a></li>
<li><a href="#a" target="_self">休闲运动</a></li>
</ul>
</li>
<li>
<a href="#">女装</a>
<ul>
<li><a href="#a" target="_self">新品</a></li>
<li><a href="#a" target="_self">明星网红</a></li>
<li><a href="#a" target="_self">时尚穿搭</a></li>
</ul>
</li>
<li>
<a href="#">童装</a>
<ul>
<li><a href="#a" target="_self">演出服</a></li>
<li><a href="#a" target="_self">运动装</a></li>
<li><a href="#a" target="_self">连衣裙</a></li>
</ul>
</li>
</ul>
</li>
<li>
<a href="#">食品</a>
<ul>
<li>
<a href="#">生活零食</a>
<ul>
<li><a href="#a" target="_self">干果</a></li>
<li><a href="#a" target="_self">辣条</a></li>
<li><a href="#a" target="_self">薯片</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</body>
</html>
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