组合继承

 1 //组合继承是Javascript最常用的继承模式
 2 function SuperType(name) {
 3     this.name = name;
 4     this.colors = ["red", "blue", "green"];
 5 }
 6 
 7 SuperType.prototype.sayName = function() {
 8     console.log(this.name);
 9 };
10 
11 function SubType(name, age) {
12     //继承属性
13     SuperType.call(this, name);
14     this.age = age;
15 }
16 
17 //继承方法
18 SubType.prototype = new SuperType();
19 
20 SubType.prototype.sayAge = function() {
21     console.log(this.age);
22 };
23 
24 var instance1 = new SubType("Nicholas", 29);
25 instance1.colors.push("black");
26 console.log(instance1.colors);
27 instance1.sayName();
28 instance1.sayAge();
29 
30 var instance2 = new SubType("Greg", 27);
31 console.log(instance2.colors);
32 instance2.sayName();
33 instance2.sayAge();