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                        /玩转Bootstrap（JS插件篇）

【题外话】为什么这个例子中的响应式导航无法实现？是因为缺少相应的js文件吗？

<nav role="navigation" class="navbar navbar-default navbar-static" id="navbar-example2">
      <div class="container-fluid">
        <div class="navbar-header">
          <button data-target=".bs-example-js-navbar-scrollspy" data-toggle="collapse" type="button" class="navbar-toggle collapsed">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a href="#" class="navbar-brand">Project Name</a>
        </div>
        <div class="collapse navbar-collapse bs-example-js-navbar-scrollspy">
          <ul class="nav navbar-nav">
            <li><a href="#fat">@fat</a></li>
            <li><a href="#mdo">@mdo</a></li>
            <li class="dropdown">
              <a aria-expanded="false" role="button" data-toggle="dropdown" class="dropdown-toggle" id="navbarDrop1" href="#">Dropdown <span class="caret"></span></a>
              <ul aria-labelledby="navbarDrop1" role="menu" class="dropdown-menu">
                <li><a tabindex="-1" href="#one">one</a></li>
                <li><a tabindex="-1" href="#two">two</a></li>
                <li class="divider"></li>
                <li><a tabindex="-1" href="#three">three</a></li>
              </ul>
            </li>
          </ul>
        </div>
      </div>
    </nav>