Object 对象 

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Object</title>
 6     <script>
 7     
 8     
 9     //   Object
10     var obj = new Object();
11     var obj = {} ;
12     obj.name= "小晖";
13     obj.age = 23;
14     obj.sex = "男";
15     obj.say = function(){
16         alert("hello wold!");
17     }
18     
19     //delete  用于删除对象的属性
20     
21     delete obj.age;
22     delete obj.name;
23     delete obj.say;
24         
25         
26     alert(obj.age);
27     alert(obj.name);
28     alert(obj.sex);
29     obj.say();  
30         
31         
32         
33     //对象枚举 for in 语句式
34     for ( var aaa in obj){
35         alert(obj[aaa]);
36     }
37     
38     for ( var abc in obj ){
39         alert(abc + " : " +obj[abc]);
40     }
41     
42     //保存着用于创建当前对象的函数
43     alert(obj.constructor);
44     
45     var arr = [];
46         
47     alert(arr.constructor);
48     //检测给定的属性在当前的对象实例中是否存在
49     alert(obj.hasOwnProperty("name"));//true
50     
51     
52     
53     </script>
54 </head>
55 <body>
56     
57 </body>
58 </html>

 

posted @ 2015-05-21 11:12  前端小晖  阅读(112)  评论(0)    收藏  举报