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 {
400px;
padding: 5px;
border: 1px solid #ff6a00;
display: none;
}
</style>
<script type="text/javascript">
$(document).ready(function () {
$("#submit_id").click(function () {
if ($("#submit_id").text() == "展开") {
$("#submit_id").text("收起");
$("#content_id").slideDown("fast");
}
else if ($("#submit_id").text() == "收起") {
$("#submit_id").text("展开");
$("#content_id").slideUp("fast");
}
else {
alert("Error!");
}
})
})
</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>