Bootstrap 虽好，但对于复杂的界面，还是有N多组件需要自己扩展，并且要往简洁、大气的Bootstrap界面上靠，着实要费一些功夫。下面分享一个Bootstrap 3的多级下拉菜单，无需第三方Js脚本，复制后直接可用。
【相关视频推荐：Bootstrap教程】
<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>Bootstrap 3 的多级下拉菜单示例</title>
<script type="text/javascript" src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<link rel="stylesheet" href="http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css"/>
<script type="text/javascript" src="http://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
<style type="text/css">
.dropdown-submenu {
position: relative;
}
.dropdown-submenu > .dropdown-menu {
top: 0;
left: 100%;
margin-top: -6px;
margin-left: -1px;
-webkit-border-radius: 0 6px 6px 6px;
-moz-border-radius: 0 6px 6px;
border-radius: 0 6px 6px 6px;
}
.dropdown-submenu:hover > .dropdown-menu {
display: block;
}
.dropdown-submenu > a:after {
display: block;
content: " ";
float: right;
width: 0;
height: 0;
border-color: transparent;
border-style: solid;
border-width: 5px 0 5px 5px;
border-left-color: #ccc;
margin-top: 5px;
margin-right: -10px;
}
.dropdown-submenu:hover > a:after {
border-left-color: #fff;
}
.dropdown-submenu.pull-left {
float: none;
}
.dropdown-submenu.pull-left > .dropdown-menu {
left: -100%;
margin-left: 10px;
-webkit-border-radius: 6px 0 6px 6px;
-moz-border-radius: 6px 0 6px 6px;
border-radius: 6px 0 6px 6px;
}
</style>
</head>
<body>
<p class="container">
<p class="row">
<h2>Bootstrap 3多级下拉菜单</h2>
<hr>
<p class="dropdown">
<a id="dLabel" role="button" data-toggle="dropdown" class="btn btn-primary" data-target="#"
href="javascript:;">
下拉多级菜单 <span class="caret"></span>
</a>
<ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu">
<li><a href="javascript:;">一级菜单</a></li>
<li><a href="javascript:;">一级菜单</a></li>
<li class="pider"></li>
<li class="dropdown-submenu">
<a tabindex="-1" href="javascript:;">一级菜单</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="javascript:;">二级菜单</a></li>
<li class="pider"></li>
<li class="dropdown-submenu">
<a href="javascript:;">二级菜单</a>
<ul class="dropdown-menu">
<li><a href="javascript:;">三级菜单</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</p>
</p>
</p>
</body>
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