1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3     String path = request.getContextPath();
 4     String basePath = request.getScheme() + "://"
 5             + request.getServerName() + ":" + request.getServerPort()
 6             + path + "/";
 7 %>
 8 
 9 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
10 <html>
11 <head>
12 <base href="<%=basePath%>">
13 
14 <title>My JSP 'jquery.jsp' starting page</title>
15 
16 <meta http-equiv="pragma" content="no-cache">
17 <meta http-equiv="cache-control" content="no-cache">
18 <meta http-equiv="expires" content="0">
19 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
20 <meta http-equiv="description" content="This is my page">
21 <script type="text/javascript" src="/common/easyui/jquery.min.js"></script>
22 <script type="text/javascript">
23     $(document).ready(function(){
24     $("input:checked").attr("checked",false);//取消已选中的复选框
25     });
26     
27 </script>
28 
29 </head>
30 <body>
31 <form>
32 <form>
33   <input type="checkbox" name="newsletter" checked="checked" value="Daily" />
34   <input type="checkbox" name="newsletter" value="Weekly" />
35   <input type="checkbox" name="newsletter" checked="checked" value="Monthly" />
36 </form> 
37 </form> 
38 
39 </body>
40 </html>

　　　　　　　　效果图1-1

重点解释：

$("input:checked")：查找所有选中的复选元素框
注释：代码中取消勾选所有曾经选中的复选框。