Bootstrap下拉菜单默认需要通过点击,才可以打开,在管理系统的开发过程中,使用悬停代替点击能减少一步操作,更人性化。下面是实现方式:

<!DOCTYPE html>
<html>
    <head>
        <link href="http://cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
        <script src="http://cdn.bootcss.com/jquery/2.1.4/jquery.js"></script>
        <script src="http://cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.js"></script>
        <script src="http://cdn.bootcss.com/bootstrap-hover-dropdown/2.0.10/bootstrap-hover-dropdown.min.js"></script>
    </head>
    <body>
        <div class="dropdown">
   <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
      data-toggle="dropdown" data-hover="dropdown">
      主题
      <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">Java</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">数据挖掘</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">
            数据通信/网络
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分离的链接</a>
      </li>
   </ul>
</div>
    </body>
</html>
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