Inheritance(Chapter 5 of JavaScript: The Good Parts)-优快云博客

本文通过JavaScript实现了一个基本的面向对象编程示例，定义了Mammal和Cat类，展示了继承和原型链的使用。Mammal类作为基类，包含获取名称的方法，而Cat类继承自Mammal，增加了猫的特有行为如叫声和咕噜声。

code

1 var Mammal = function (name) {
2                 this.name = name;
3             };
4
5             Mammal.prototype.get_name = function () {
6                 return this.name;
7             }
8
9             Mammal.prototype.says = function () {
10                 return this.saying || '';
11             };
12
13             var myMammal = new Mammal('Herb the Mammal');
14             var name = myMammal.get_name();
15             alert(name);
16
17             var Cat = function (name) {
18                 this.name = name;
19                 this.saying = 'meow';
20             };
21
22             Cat.prototype = new Mammal();
23             Cat.prototype.purr = function (n) {
24                 var i, s = '';
25                 for (i = 0; i < n; i += 1) {
26                     if (s) {
27                         s += '-';
28                     }
29                     s += 'r';
30                 }
31                 return s;
32             };
33
34             Cat.prototype.get_name = function () {
35                 return this.says() + ' ' + this.name + ' ' + this.says();
36             };
37
38 var myCat = new Cat('Henrietta');
39
40 alert(myCat.says());
41 alert(myCat.purr(5));
42 alert(myCat.get_name());

转载于:https://www.cnblogs.com/zhtf2014/archive/2010/07/10/1774790.html