ES6与ES5继承比较

1. 关于ES5寄生构造函数继承

    /*寄生组合式继承*/
function inHeritPrototype(SuperType,SubType) {
    var prototype=Object(SuperType);//创建对象
    prototype.constructor=SubType;//增强对象
    SubType.prototype=prototype;
}
function SuperType(name){
    this.name=name;
    this.colors=["blue","white"];
}
SuperType.prototype.sayName=function () {
    console.log(this.name);
};

function SubType(age,name) {
    SuperType.call(this, name);
    this.age=age;
}
inHeritPrototype(SuperType,SubType);
SubType.prototype.sayAge=function () {
    return this.age;
};
var instance1=new SubType("hello",28);
console.log(instance1);

2. ES6继承方法

 class SuperType{
        constructor(name){
            this.name=name;
            this.colors=["blue","white"]
        }
        sayName(){
            console.log(this.name)
        }
    }

    class SubType extends SuperType{
        constructor(name,age){
            super(name);//super调用父类的方法，会绑定子类的this.
            this.age = age;
        }
        sayAge(){
            return this.age;
        }
    }
    var instance2 = new SubType("hello",29);
    console.log(instance2);

ES5继承实质：先创建实例对象this,再将父类方法添加到this上面。
ES6继承实质：先创造父类的实例对象this,用子类的构造函数修改this.