JS 实现点击展开菜单

1：获取事件源的两种方式
2： overflow 控制展现
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	
	 <script type="text/javascript">
  		 // 第二种通过this对象获取时间源
  		function list(node){
  			//alert(""");
  			var dlNode = node.parentNode;
  			var nodes = document.getElementsByTagName("dl");
  			//alert(nodes.length);
  			for (var i = 0; i < nodes.length; ++i) {
  				if (nodes[i] == dlNode) {
  					if (nodes[i].className == "close") {
  						nodes[i].className = "open";
  					} else {
  						nodes[i].className = "close";
  					}
  				} else {
  					nodes[i].className = "close";
  				}
  			}
  		}  
  		/* 第一种通过event获取时间源
  		function list(){
  			var node = event.srcElement;
  			var dlNode = node.parentNode;
  			var nodes = document.getElementsByTagName("dl");
  			//alert(nodes.length);
  			for (var i = 0; i < nodes.length; ++i) {
  				if (nodes[i] == dlNode) {
  					if (nodes[i].className == "close") {
  						nodes[i].className = "open";
  					} else {
  						nodes[i].className = "close";
  					}
  				} else {
  					nodes[i].className = "close";
  				}
  			}
  		} */
  	 </script>
  	 
  	 <style type="text/css">
  	 	.open{
  	 		overflow: visible;
  	 	}
  	 	.close{
  	 		overflow: hidden;
  	 	}
  	 	dl{
  	 		overflow: hidden;
  	 		height: 16px;
  	 	}
  	 </style>
  </head>
 
  
  
  <body>
    <dl>
    	<dt onclick="list(this)">会员管理</dt>
	    	<dd>添加会员</dd>
	    	<dd>删除会员</dd>
	    	<dd>查询会员</dd>
    </dl>
 	<dl>
    	<dt onclick="list(this)">会员管理</dt>
	    	<dd>添加会员</dd>
	    	<dd>删除会员</dd>
	    	<dd>查询会员</dd>
    </dl>
    <dl>
    	<dt onclick="list(this)">会员管理</dt>
	    	<dd>添加会员</dd>
	    	<dd>删除会员</dd>
	    	<dd>查询会员</dd>
    </dl>
    <dl>
    	<dt onclick="list(this)">会员管理</dt>
	    	<dd>添加会员</dd>
	    	<dd>删除会员</dd>
	    	<dd>查询会员</dd>
    </dl>
    <dl>
    	<dt onclick="list(this)">会员管理</dt>
	    	<dd>添加会员</dd>
	    	<dd>删除会员</dd>
	    	<dd>查询会员</dd>
    </dl>
  </body>
</html>