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我做了一个Navbar的引导程序3.我的问题是如何让它被选中时着色？ 一切工作正常否则。我相信它需要一些JavaScript，但我不知道如何实现它。试图添加底纹到选定的引导程序3导航栏
这是我的代码：
<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<div style="font-family:Webdings;">
<%= link_to "lalala", root_path, class: 'navbar-brand' %>
</div>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav">
<li><%= link_to "laaa", lal_path %></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">lala<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><%= link_to "lala", laa_path %></li>
<li><%= link_to "lalala", lala_path %></li>
<li><%= link_to "lalala", lala_path %></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>
<a href="https:lalala" class="twitter-follow-button" data-show-count="false" data-show-screen-name="false">Follow @lalala</a>
</li>
<li>
<div class="fb-like" data-href="lalala" data-width="600" data-layout="button_count" data-show-faces="true" data-send="false"></div>
</li>
<li><%= link_to "lala", contact_path %></li>
<li><%= link_to "lalalala", register_path %></li>
</ul>
</div><!-- /.navbar-collapse -->
</nav>