简单实现点击可展开、关闭的CSS竖向菜单

<html>
<head>
<title></title>
<style type="text/css">
.menutitle{
cursor:pointer;
margin-bottom: 5px;
background-color:#eeeeee;
188px;
padding:2px;
text-align:center;
font-weight:bold;
}
.submenu{
margin-bottom: 0.5em;
}
</style>
<script type="text/javascript">
if (document.getElementById){ //http://www.codefans.net
document.write('<style type="text/css">\n')
document.write('.submenu{display: none;}\n')
document.write('</style>\n')
}

function SwitchMenu(obj){
if(document.getElementById){
var el = document.getElementById(obj);
var ar = document.getElementById("masterdiv").getElementsByTagName("span"); //DynamicDrive.com change
 if(el.style.display != "block"){ //DynamicDrive.com change
  for (var i=0; i<ar.length; i++){
 if (ar[i].className=="submenu") //DynamicDrive.com change
   ar[i].style.display = "none";
  }
  el.style.display = "block";
 }else{
 el.style.display = "none";
 }
 }
}
</script>
</head>
<body>
<!-- Codes by http://www.codefans.net-->
<div id="masterdiv">
 <div class="menutitle" onclick="SwitchMenu('sub1')">CodeFans.net's Menu</div>
 <span class="submenu" id="sub1">
  - <a href="http://www.codefans.net">CodeFans.NET</a>
  - <a href="http://www.codefans.net">What's hot</a>
  - <a href="http://www.codefans.net">CodeFans.NET</a>
  - <a href="http://www.codefans.net">More Zone</a>
 </span>
 <div class="menutitle" onclick="SwitchMenu('sub2')">FAQ/Help</div>
 <span class="submenu" id="sub2">
  - <a href="http://www.codefans.net">CodeFans.NET</a>
  - <a href="http://www.codefans.net">DHTML FAQs</a>
  - <a href="http://www.codefans.net">Scripts FAQs</a>
 </span>
 <div class="menutitle" onclick="SwitchMenu('sub3')">Help Forum</div>
 <span class="submenu" id="sub3">
  - <a href="http://www.codingforums.com">Coding Forums</a>
 </span>
 <div class="menutitle" onclick="SwitchMenu('sub4')">Cool Links</div>
 <span class="submenu" id="sub4">
  - <a href="http://codefans.net">JavaScript Kit</a>
  - <a href="http://codefans.net">CodeFans.NET</a>
  - <a href="http://codefans.net">Cool Text</a>
  - <a href="http://codefans.net">CodeFans.NET</a>
 </span>
 <img src="http://www.codefans.net/images/logo.gif" onclick="SwitchMenu('sub6')">

 <span class="submenu" id="sub6">
  - <a href="http://codefans.net">Link to DD</a>
  - <a href="http://codefans.net/">CodeFans.NET</a>
  - <a href="http://codefans.net">Email Us</a>
 </span>
</div>
</body>
</html>

原文地址:https://www.cnblogs.com/juan/p/1440263.html