<!-- Collect the nav links,forms,and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"&gt;
  <form class="navbar-form navbar-right" role="search"&gt;
    <div class="form-group"&gt;
      <input type="text" class="form-control" placeholder="Email"&gt;
    </div>
    <div class="form-group"&gt;
      <input type="password" class="form-control" placeholder="Password"&gt;
    </div>
    <button type="submit" class="btn btn-success" onclick="signin()"&gt;Sign in</button>
    <script>
      <!--这里是登录按钮的方法实现,可以根据需要自定义-->
      function signin(){

        alert("点击了登录");
      }

    </script>
  </form>
</div><!-- /.navbar-collapse -->