Bootstrap可折叠菜单无法正常工作

Question

I'm having an issue getting the collapsible navigation bar to load on a page - the button appears when you shrink the screen, but when I click on it, nothing happens. The console isn't throwing me any errors, so I'm assuming there must be something wrong with my css/javascript, but I don't really know what.

If it matters, I'm linking through with the Bootstrap CDN on my page - I don't know if that requires me to include the plugins manually or not (I don't think it would but I'm not sure).

The following is my HTML and Javascript link-ins:

 <div class="navbar-header">
    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="navbar-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>

  <!-- Collect the nav links, forms, and other content for toggling -->
  <div class="collapse navbar-collapse">
    <ul class="nav navbar-nav">
      <li class="active"><a href="/">Home</a></li>
      <li><a href="#">Operation Pulse</a></li>
      <li><a href="#">Forum</a></li>
      <li class="dropdown">
        <a href="#" class="dropdown-toggle" data-toggle="dropdown">Media <b class="caret"></b></a>
        <ul class="dropdown-menu">
          <li><a href="news/">News &amp; Updates</a></li>
          <li><a href="#">Indie Pulse</a></li>
          <li><a href="#" style="text-transform: lowercase;">rec</a></li>
          <li><a href="#">Geeks and Giggles</a></li>
          <li class="divider"></li>
          <li><a href="#">Podcasts</a></li>
        </ul>
      </li>
      <li class="dropdown">
        <a href="#" class="dropdown-toggle" data-toggle="dropdown">Info <b class="caret"></b></a>
        <ul class="dropdown-menu">
          <li><a href="#">About Us</a></li>
          <li><a href="#">FAQ</a></li>
          <li><a href="crew.php">Crew</a></li>
          <li><a href="contact.php">Contact Us</a></li>
        </ul>
      </li>
    </ul>
  </div>

JS

<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.2/css/bootstrap.min.css" rel="stylesheet">
    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="//code.jquery.com/jquery.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="//netdna.bootstrapcdn.com/bootstrap/3.0.2/js/bootstrap.min.js" type="text/javascript"></script>

Answer 1

将按钮中的data-target=更改为.. .navbar-collapse

<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">

Answer 2

Most of the time, boostrap.js file reference two times. In our case, it was referenced twice, one in master and others by mistake in the inner pages (Page layout in SharePoint Case).