组合继承

//组合继承是Javascript最常用的继承模式
function SuperType(name) {
    this.name = name;
    this.colors = ["red", "blue", "green"];
}

SuperType.prototype.sayName = function() {
    console.log(this.name);
};

function SubType(name, age) {
    //继承属性
    SuperType.call(this, name);
    this.age = age;
}

//继承方法
SubType.prototype = new SuperType();

SubType.prototype.sayAge = function() {
    console.log(this.age);
};

var instance1 = new SubType("Nicholas", 29);
instance1.colors.push("black");
console.log(instance1.colors);
instance1.sayName();
instance1.sayAge();

var instance2 = new SubType("Greg", 27);
console.log(instance2.colors);
instance2.sayName();
instance2.sayAge();