JavaScript实现竖向折叠菜单的完整代码示例

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>竖向的折叠菜单</title>
<script language = JavaScript>
function showmenu(id) {
 var list = document.getElementById("list"+id);
 var menu = document.getElementById("menu"+id)
 if (list.style.display=="none") {
  document.getElementById("list"+id).style.display="block";
  menu.className = "title1";
 }else {
  document.getElementById("list"+id).style.display="none";
  menu.className = "title";
 }
} 
</script>
<style type="text/css">
<!--
*{margin:0;padding:0;list-style:none;font-size:14px}
#nav{margin:10px;text-align:center;line-height:25px;width:200px;}
.title{background:#336699;color:#fff;border-bottom:1px solid #fff;cursor:pointer;}
.title1{background:#888;color:#000;border-bottom:1px solid #666;cursor:pointer;}
.content li{color:#336699;background:#ddd;border-bottom:1px solid #fff;}
-->
</style>
</head>
<body>
<div id="nav">  
  <div class="title" id="menu1" onclick="showmenu('1') ">Ajax下载</div>
  <div id="list1" class="content" style="display:none">
   <ul>
    <li>jQuery</li>
    <li>Extjs</li>
    <li>Mootools</li>
    </ul>
  </div> 
  <div class="title" id="menu2" onclick="showmenu('2')">网页代码</div>
  <div id="list2" class="content" style="display:none">
    <ul>
    <li>菜单导航</li>
    <li>层和布局</li>
    <li>图片切换</li>
    </ul>
  </div> 
</div>
</body>
</html>