1.
1 // Since JavaScript doesn't exactly have sub-class objects, prototype is a useful workaround to make a "base class" object of certain functions that act as objects. For example:
2 var Person = function() {
3 this.canTalk = true;
4 };
5
6 Person.prototype.greet = function() {
7 if (this.canTalk) {
8 console.log('Hi, I am ' + this.name);
9 }
10 };
11
12 var Employee = function(name, title) {
13 Person.call(this);
14 this.name = name;
15 this.title = title;
16 };
17
18 Employee.prototype = Object.create(Person.prototype);
19 Employee.prototype.constructor = Employee;
20
21 Employee.prototype.greet = function() {
22 if (this.canTalk) {
23 console.log('Hi, I am ' + this.name + ', the ' + this.title);
24 }
25 };
26
27 var Customer = function(name) {
28 Person.call(this);
29 this.name = name;
30 };
31
32 Customer.prototype = Object.create(Person.prototype);
33 Customer.prototype.constructor = Customer;
34
35 var Mime = function(name) {
36 Person.call(this);
37 this.name = name;
38 this.canTalk = false;
39 };
40
41 Mime.prototype = Object.create(Person.prototype);
42 Mime.prototype.constructor = Mime;
43
44 var bob = new Employee('Bob', 'Builder');
45 var joe = new Customer('Joe');
46 var rg = new Employee('Red Green', 'Handyman');
47 var mike = new Customer('Mike');
48 var mime = new Mime('Mime');
49
50 bob.greet();
51 // Hi, I am Bob, the Builder
52
53 joe.greet();
54 // Hi, I am Joe
55
56 rg.greet();
57 // Hi, I am Red Green, the Handyman
58
59 mike.greet();
60 // Hi, I am Mike
61
62 mime.greet();
You can do anything you set your mind to, man!
Original: https://www.cnblogs.com/shamgod/p/5523313.html
Author: shamgod
Title: 面向对象的JavaScript-003
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