1 <!DOCTYPE html>
2 <html>
3 <head>
4 <meta charset="UTF-8">
5 <title></title>
6 <script type="text/javascript">
7
8 function Person(name , age , gender){
9 this.name = name;
10 this.age = age;
11 this.gender = gender;
12 }
13
14 //修改Person原型的toString
15 Person.prototype.toString = function(){
16 return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";
17 };
18
19
20 //创建一个Person实例
21 var per = new Person("孙悟空",18,"男");
22 var per2 = new Person("猪八戒",28,"男");
23
24 //当我们直接在页面中打印一个对象时，事件上是输出的对象的toString()方法的返回值
25 //如果我们希望在输出对象时不输出[object Object]，可以为对象添加一个toString()方法
26 //Person[name=孙悟空,age=18,gender=男]
27 /*per.toString = function(){
28 return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";
29 };*/
30
31 var result = per.toString();
32 //console.log("result = " + result);
33 //console.log(per.__proto__.__proto__.hasOwnProperty("toString"));
34 console.log(per2);
35 console.log(per);
36
37
38 </script>
39 </head>
40 <body>
41 </body>
42 </html>