Bootstrap3子菜单隐藏onclick子项

<nav class="navbar navbar-default">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" 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>
      <a class="navbar-brand" href="#">Logo</a>
    </div>
    <div class="collapse navbar-collapse" id="navbar-collapse">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Submenu 1</a></li>
            <li><a href="#">Submenu 2</a></li>
            <li><a href="#">Submenu 3</a></li>
          </ul>
        </li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </div>
  </div>
</nav>

$(document).ready(function() {
  $('.dropdown-toggle').click(function() {
    $(this).next('.dropdown-menu').toggle();
  });
});