bootstrap下拉菜单点击时间的变成hover只需三步

1，首先在head中引入文件

<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>

2，然后把下面的代码复制在nav中

<div class="dropdown">
  <button id="dLabel" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown trigger
   <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
    ...
  </ul>
</div>

3，在butoon中的 <button id="dLabel" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 更换为

<button type="button" class="btn dropdown-toggle" id="dropdownMenu1"  data-toggle="dropdown" data-hover="dropdown">