效果：
代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>显示和隐藏DIV</title>
<script src="JavaScript/jquery-1.8.3.min.js"></script>
<style type="text/css">
.content {
width: 400px;
padding: 5px;
border: 1px solid #ff6a00;
display: block;
}
</style>
<script type ="text/javascript">
$(document).ready(function () {
$("#submit_id").click(function () {
//$("#content_id").toggle("slow", "linear");
$("#content_id").slideToggle("slow");
})
})
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<span><a id ="submit_id" href ="Javascript:void(0)">展开</a></span>
<div id ="content_id" class="content">
<p>TESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTEST</p>
<p>TESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTEST</p>
<p>TESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTEST</p>
<p>TESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTEST</p>
<p>TESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTEST</p>
<p>TESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTEST</p>
</div>
</div>
</form>
</body>
</html>
原文：http://www.cnblogs.com/KTblog/p/4783198.html