Length属性
属性用于返回当前jQuery对象的元素个数。
语法
jQueryObject.length
返回值
Number类型 返回该jQuery对象封装的DOM元素的个数。
实例说明
代码
1 <!DOCTYPE html>
2 <html lang="zh-CN">
3 <head lang="en">
4 <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
5
6 </head>
7 <body>
8 <div></div>
9 <div></div>
10 <div>
11 <ul>
12 <li>one</li>
13 <li>two</li>
14 <li>three</li>
15 </ul>
16 </div>
17 <script>
18 var j_li = $("div");
19 document.writeln( j_li.length );
20 var j_p = $("p");
21 document.writeln( j_p.length );//无<p>标签所以结果为0
22 </script>
23 </body>
24 </html>
运行结果
aaarticlea/png;base64,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" alt="" />
King_dream
2015-04-16 15:14:27