Bootstrap CSS组件之下拉菜单(dropdown)

2019-11-19 18:25:10

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Bootstrap下拉菜单，常用在开发项目中，今天为大家介绍介绍

dropdown、dropdown-menu、dropdown-header、divider、dropdown-submenu
例子见下拉菜单.html

//源码.dropup,.dropdown { position: relative;}.dropdown-toggle:focus { outline: 0;}.dropdown-menu { position: absolute; top: 100%; left: 0; z-index: 1000; display: none; float: left; min-width: 160px; padding: 5px 0; margin: 2px 0 0; font-size: 14px; text-align: left; list-style: none; background-color: #fff; -webkit-background-clip: padding-box;     background-clip: padding-box; border: 1px solid #ccc; border: 1px solid rgba(0, 0, 0, .15); border-radius: 4px; -webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, .175);     box-shadow: 0 6px 12px rgba(0, 0, 0, .175);}.dropdown-menu.pull-right { right: 0; left: auto;}.dropdown-menu .divider { height: 1px; margin: 9px 0; overflow: hidden; background-color: #e5e5e5;}.dropdown-header { display: block; padding: 3px 20px; font-size: 12px; line-height: 1.42857143; color: #777; white-space: nowrap;}

<!DOCTYPE html><html lang="en"> <head>  <meta charset="utf-8">  <meta http-equiv="X-UA-Compatible" content="IE=edge">  <!-- Bootstrap从3.0版本开始全面支持移动平台，贯彻移动先行宗旨 -->  <meta name="viewport" content="width=device-width, initial-scale=1">  <title>Bootstrap 101 Template</title>  <!-- Bootstrap -->  <link href="bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet"> </head> <body>  <!-- -->  <div class="btn-group">    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">      我的书籍<span class="caret"></span>    </button>    <ul class="dropdown-menu">      <li><a href="#">编程</a></li>      <li><a href="#">设计</a></li>      <li><a href="#">深入</a></li>    </ul>  </div>  <!-- dropdown/dropdown-menu/dropdown-header -->  <div class="dropdown">    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">      我的书籍<span class="caret"></span>    </button>    <ul class="dropdown-menu">      <li class="dropdown-header">前端</a></li>      <li><a href="#">JS</a></li>      <li><a href="#">HTML</a></li>      <li><a href="#">CSS</a></li>      <li class="divider"></li>      <li class="dropdown-header">后台</li>      <li><a href="#">PYTHON</a></li>      <li><a href="#">JAVA</a></li>    </ul>  </div>  <!-- bootstrap是基于jQuery-->  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>  <script src="bootstrap-3.3.7-dist/js/bootstrap.min.js"></script> </body></html>

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