演示--Jquery核心选择器 

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml">
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 5 <title>index</title>
 6 <script type="text/javascript" src="jquery-3.1.1.min.js">
 7     
 8 </script>
 9 <script type="text/javascript">
10     $(function(){
11             console.log("选择器“*”长度为:"+$("*").length);
12             console.log("选择器“p”长度为:"+$("p").length);
13             console.log("选择器“.test”长度为:"+$(".test").length);
14             console.log("选择器“div.test”长度为:"+$("div.test").length);
15             console.log("选择器“#test1”长度为:"+$("#test1").length);
16         }
17     );
18 </script>
19 </head>
20 <body>
21 <div>
22     <p>hello world!</p>
23 </div>
24 <div class="test" id="test">
25     <h3 class="test">hello world!</h3>
26     <h2 class="test1">hello world!</h2>
27 </div>
28 <div class="test1" id="test1">
29     <h1>hello world!</h1>
30 </div>
31 </body>
32 </html>

页面效果：

 

posted @ 2016-10-03 12:20  舒山  阅读(236)  评论(0)  编辑  收藏  举报