一：示例图如下：
二：示例代码：
<%@ 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></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" src="<%=basePath %>js/jquery-1.6.4.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('.t').click(function(){
$(this).toggleClass("selected").siblings(".child_"+this.id).toggle();
}).click();//不添加click()方法默认打开是全展现
});
</script>
<style type="text/css">
*{padding:0;margin:0;}
body {padding:100px;font-size:12px;font-family:"宋体";}
table{border-coliapse:coliapse;}
th{border-bottom:1px solid #000;padding:5px 15px;}
td{padding:5px 15px;}
.t{background:#eee;cursor:pointer;}
.selected{background:#ccc}
</style>
</head>
<body>
<table border="1">
<thead>
<th>姓名</th><th>年龄</th><th>电话</th>
</thead>
<tbody>
<tr class="t" id="row_1"><td colspan="3">第一组</td></tr>
<tr class="child_row_1"><td>王子虎</td><td>22</td><td>13064073789</td></tr>
<tr class="child_row_1"><td>王子虎1</td><td>21</td><td>13064073701</td></tr>
<tr class="t" id="row_2"><td colspan="3">第二组</td></tr>
<tr class="child_row_2"><td>王子虎2</td><td>23</td><td>13064073702</td></tr>
<tr class="child_row_2"><td>王子虎3</td><td>24</td><td>13064073703</td></tr>
<tr class="t" id="row_3"><td colspan="3">第三组</td></tr>
<tr class="child_row_3"><td>王子虎4</td><td>25</td><td>13064073704</td></tr>
<tr class="child_row_3"><td>王子虎5</td><td>26</td><td>13064073705</td></tr>
</tbody>
</table>
</body>
</html>
点击我
. 像上面这样把JavaSript代码和HTML代码混杂在一起的做法同样也非常不妥，因为它并没有将网页内容和行为分离，所以才有JQuery选择器的学习.点击我
. //给class为demo的元素添加行为.你最喜欢的水果是?
.