寄生组合式继承

 1 //寄生组合式继承
 2 function object(o) {
 3     function F() {}
 4     F.prototype = o;
 5     return new F();
 6 }
 7 
 8 function inheritPrototype(subType, superType) {
 9     var prototype = object(superType.prototype);
10     prototype.constructor = subType;
11     subType.prototype = prototype;
12 }
13 
14 function SuperType(name) {
15     this.name = name;
16     this.colors = ["red", "blue", "green"];
17 }
18 
19 SuperType.prototype.sayName = function() {
20     console.log(this.name);
21 };
22 
23 function SubType(name, age) {
24     SuperType.call(this, name);
25     this.age = age;
26 }
27 
28 inheritPrototype(SubType, SuperType);
29 
30 SubType.prototype.sayAge = function() {
31     console.log(this.age);
32 };
33 
34 var instance1 = new SubType("Nicholas", 29);
35 instance1.colors.push("black");
36 console.log(instance1.colors);
37 instance1.sayName();
38 instance1.sayAge();
39 
40 var instance2 = new SubType("Greg", 27);
41 console.log(instance2.colors);
42 instance2.sayName();
43 instance2.sayAge();