【代码片段】jQuery测试层次选择器

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html>
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 5 <title>第2章示例7</title>
 6 <style type="text/css">
 7     body { width:760px; }
 8     div,p,h3,h1 { border:4px solid black; background-color:green; color:white; margin:6px; padding:5px; font:bold 14px/1 Arial,Helvetica,sans-serif; width:220px; float:left; }
 9     div p { width:205px; border-width:2px; margin:5px 0; float:none; }
10     h1 { margin:6px 256px; }  h3 { position:relative; margin-right:500px; }
11     div.top { height:65px; }
12     .clear { clear:both; }
13     div.hide { display:none; }  p.hide { visibility:hidden; }
14     .highlight { background-color:gold; color:black; }
15     form { clear:both; }
16     button { font:bold 16px/1 Arial,Helvetica,sans-serif; margin:1px 3px; padding:2px; cursor:pointer; width:175px; }
17 </style>
18 <script src="http://code.jquery.com/jquery-1.9.1.min.js" type="text/javascript"></script>
19 <script type="text/javascript">
20     $(document).ready(function(){
21         $("button").click(function(){$("*").removeClass("highlight");});
22         $("#btn1").click(function(){$("body p").addClass("highlight");});    
23         $("#btn2").click(function(){$("body>p").addClass("highlight");});    
24         $("#btn3").click(function(){$("h3+p").addClass("highlight");});
25         $("#btn4").click(function(){$("h3~p").addClass("highlight");});
26         function swing() {
27             $("h3").animate({left:"500"},7000)
28                     .animate({left:"0"},7000, swing);
29         }
30         swing();                            
31     });
32 </script>
33 </head>
34 <body>
35     <h1>&lt;h1&gt; &lt;/h1&gt;</h1>    
36     <div class="clear top">
37         &lt;div class="clear top"&gt;
38         <p>&lt;p&gt;hello&lt;/p&gt;</p>
39         &lt;/div&gt;
40     </div>
41     <div class="top" id="core">
42         &lt;div class="top" id="core"&gt;
43         <p>&lt;p&gt; &lt;/p&gt;</p>
44         &lt;/div&gt;
45     </div>
46     <div class="top">
47         &lt;div class="top"&gt;<br/>
48         hello, John<br/>
49         &lt;/div&gt;
50     </div>        
51     <p class="clear">&lt;p class="clear"&gt; &lt;/p&gt;</p>
52     <p>&lt;p &gt; &lt;/p&gt;</p>
53     <p>&lt;p &gt; &lt;/p&gt;</p>    
54     <h3 class="clear">&lt;h3 class="clear"&gt; &lt;/h3&gt;</h3>    
55     <p class="clear">&lt;p class="clear"&gt; &lt;/p&gt;</p>
56     <p>&lt;p &gt; &lt;/p&gt;</p>
57     <p class="hide">&lt;p class="hide"&gt; &lt;/p&gt;</p>
58     <div class="clear bottom">
59         &lt;div class="clear bottom"&gt;
60         <p>&lt;p&gt; &lt;/p&gt;</p>
61         <p>&lt;p&gt; &lt;/p&gt;</p>
62         <p>&lt;p&gt; &lt;/p&gt;</p>
63         &lt;/div&gt;
64     </div>
65     <div class="bottom">
66         &lt;div class="bottom"&gt;
67         <p>&lt;p&gt; &lt;/p&gt;</p>
68         <p>&lt;p&gt; &lt;/p&gt;</p>
69         <p>&lt;p&gt; &lt;/p&gt;</p>        
70         &lt;/div&gt;
71     </div>
72     <div class="hide bottom">
73         &lt;div class="hide bottom"&gt;
74         <p>&lt;p&gt; &lt;/p&gt;</p>
75         <p>&lt;p&gt; &lt;/p&gt;</p>
76         <p>&lt;p&gt; &lt;/p&gt;</p>        
77         &lt;/div&gt;
78     </div>
79     <form>
80         <button type="button" id="btn1">$("body p")</button>
81         <button type="button" id="btn2">$("body>p")</button>
82         <button type="button" id="btn3">$("h3+p")</button>
83         <button type="button" id="btn4">$("h3~p")</button>
84     </form>
85 </body>
86 </html>
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原文地址：https://www.cnblogs.com/kojya/p/2944824.html