Bootstrap 3菜单-两个折叠按钮-一次只有一个打开

我正试图在bootstrap 3中制作菜单。当它缩小到移动尺寸时，我有两个折叠导航切换按钮。默认情况下，当一个打开时，它只是堆叠在另一个上面。我想要的是每次打开一个下拉菜单。

    <nav class="navbar navbar-default navbar-fixed-top" role="navigation">
  <div class="container">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".nav-search">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>
    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Link</a></li>
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li class="divider"></li>
            <li><a href="#">Separated link</a></li>
            <li class="divider"></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
      <form class="navbar-form navbar-left" role="search">
        <div class="form-group">
          <input type="text" class="form-control" placeholder="Search">
        </div>
        <button type="submit" class="btn btn-default">Submit</button>
      </form>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li class="divider"></li>
            <li><a href="#">Separated link</a></li>
          </ul>
        </li>
      </ul>
    </div><!-- /.navbar-collapse -->
    <div id="test2" class="nav-search collapse">
            <div class="search_box">
            <ul class="nav navbar-nav">
                <li><a href="#">message 1</a></li>
                <li><a href="#">message 1</a></li>
                <li><a href="#">message 1</a></li>
                <li><a href="#">message 1</a></li>
            </ul>
            </div><!-- end search_box -->
      </div><!--/.nav-search -->
  </div><!-- /.container-fluid -->
</nav>

我搜索并发现了这个，，但这是为引导2:引导菜单-两个折叠按钮相互切换?意思是，一次只打开一个

我觉得我错过了一些容易的东西。下面是一个jsfiddle链接:http://jsfiddle.net/Bootstrap714/RfsS9/4/