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<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
<!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 runat="server">
<title></title>
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
<script type="text/javascript">
function show(s) {
o = document.getElementById(s);
if (o.style.display == "") {
o.style.display = "none";
return;
}
o.style.display = "";
}
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<body>
<form id="form1" runat="server">
<div>
<ul style="float: left; width: 200px;text-align:center;list-style:none;margin:0px;">
<li onclick="show('a')" style="background-color:Red;"><a href="#">菜单</a></li>
<li id='a' style="display: none;">
<ul>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
</ul>
</li>
<li onclick="show('b')" style="background-color:Green;"><a href="#">菜单</a></li>
<li id='b' style="display: none">
<ul>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
</ul>
</li>
<li onclick="show('c')" style="background-color:Blue;"><a href="#">菜单</a></li>
<li id='c' style="display: none">
<ul>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
</ul>
</li>
<li onclick="show('d')" style="background-color:Yellow;"><a href="#">菜单</a></li>
<li id='d' style="display: none">
<ul>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
<li>菜单</li>
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