如何将导航链接移动到下拉列表中

<nav>
  <ul class="navigation">
    <li><a href="#">首页</a></li>
    <li><a href="#">产品</a></li>
    <li class="dropdown">
      <a href="#">服务</a>
      <ul class="dropdown-menu">
        <li><a href="#">云计算</a></li>
        <li><a href="#">人工智能</a></li>
        <li><a href="#">物联网</a></li>
      </ul>
    </li>
    <li><a href="#">关于我们</a></li>
  </ul>
</nav>

.navigation {
  list-style-type: none;
  margin: 0;
  padding: 0;
  background-color: #f1f1f1;
}

.navigation li {
  display: inline-block;
}

.navigation li a {
  display: block;
  padding: 10px 20px;
  text-decoration: none;
  color: #333;
}

.dropdown-menu {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  padding: 10px;
}

.dropdown:hover .dropdown-menu {
  display: block;
}

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