jQuery创建折叠式菜单

<ul class="accordion">
 <li class="selected">
  <span>北京景点</span>
  <div>
  <ul>
   <li>故宫</li>
   <li>十三陵</li>
   <li>圆明园</li>
   <li>长城</li>
  </ul>
  </div>
 </li>
 <li>
  <span>上海景点</span>
  <div>
  <ul>
   <li>东方明珠</li>
   <li>外滩</li>
   <li>豫园</li>
   <li>龙华寺</li>
  </ul>
  </div>
 </li>
 <li>
  <span>广州景点</span>
  <div>
  <ul>
   <li>白云山</li>
   <li>中山纪念堂</li>
   <li>华南植物园</li>
   <li>越秀公园</li>
  </ul>
  </div>
 </li>
 <li>
  <span>深圳景点</span>
  <div>
  <ul>
   <li>世界之窗</li>
   <li>东门老街</li>
   <li>海上田园旅游区</li>
   <li>中信明思克航母</li>
  </ul>
  </div>
 </li>
 <li>
  <span>厦门景点</span>
  <div>
  <ul>
   <li>鼓浪屿</li>
   <li>集美嘉庚园</li>
   <li>万石植物园</li>
   <li>方特梦幻王国</li>
  </ul>
  </div>
 </li>
</ul>

$(function () {
  $("ul.accordion li span").on('click', function () {
  $(this).parent().siblings().removeClass('selected').find('div').hide();
  $(this).parent().addClass('selected');
  $(this).next().slideDown(500);
  });
 });

<style>
 body {
  font-family: Verdana, Arial, Helvetica, sans-serif;
 }
 
 .accordion,
 .accordion ul { /* 折叠菜单及其子菜单的通用样式 */
  font-size: 14px;
  font-weight: bold;
  width: 300px;
  margin: 0;
  padding: 0;
  list-style: none;
  text-align: center;
  border: 5px solid #343b42;
 }
 
 .accordion ul {
  border: 0;
 }
 
 .accordion ul li { /* 子菜单的菜单项样式 */
  line-height: 50px;
  height: 50px;
  color: #e6efee;
  border-bottom: 1px solid #383b4c;
  background-color: #282b3a;
 }
 
 .accordion li span { /* 折叠菜单的标题样式 */
  line-height: 60px;
  display: block;
  height: 60px;
  color: #e6efee;
  border: 2px solid #343b42;
  background-color: #3789d3;
 }
 
 .accordion li.selected span { /* 折叠菜单选中项的标题样式 */
  color: #e6efee;
  background-color: #393c4b;
 }
 
 .accordion li div { /* 子菜单平时不显示 */
  display: none;
 }
 
 .accordion li.selected div { /* 添加了selected样式时才显示 */
  display: block;
 }
</style>