Bootstrap 3多级下拉菜单实例

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。

<!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>
<div class="container">
  <div class="row">
    <h2>Bootstrap 3多级下拉菜单</h2>
    <hr>
    <div 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="divider"></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="divider"></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>
    </div>
  </div>
</div>
</body>
</html> 

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