JQuery学习(选择器-可见性-hidden)

 <%@ 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>My JSP 'jquery.jsp' starting page</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">
 <script type="text/javascript" src="/common/easyui/jquery.min.js"></script>
 <script type="text/javascript">
 $(document).ready(function(){
 $("tr:hidden").css("display","block");
 });
 </script>
 </head>
 <body>
 <table>
   <tr style="display:none"><td>Value 1</td></tr>
   <tr><td>Value 2</td></tr>
 </table>
 </body>
 </html>

30   <tr style="display:none"><td>Value 1</td></tr>

此行代码隐藏了tr

24 $("tr:hidden").css("display","block");

此行代码选中了所有tr为hidden的元素，指定显示方式为block

重点解释：
:hidden
匹配所有的不可见元素，input 元素的 type 属性为 "hidden" 的话也会被匹配到
$("tr:hidden")
查找type为hidden的tr元素
相似知识点：
:visible
匹配所有的可见元素
$("tr:visible")
查找type为visible的tr元素