不调用构造方法实现继承的疑问

不使用构造继承时，在控制台输出的结果不符合您所写的文章的预期。不知道是不是我的代码有问题

function Parent(name, age) {
  this.name = name;
  this.age = age;
}

Parent.prototype.getName = function() {
  return this.name;
}

Parent.prototype.getAge = function() {
  return this.age;
}

Parent.prototype.love = function() {
  game: ['FPS'];
}

Parent.pay = function() {
  return 1000;
}

//不调用构造方法实现
function Son() {};
Son.prototype = new Parent();
Son.prototype.constructor = Son;

var parent = new Parent('jack', 40);
var son = new Son('tom', 20);

console.log('sonName: ' + son.getName());//sonName: undefined
console.log('parentName: ' + parent.getName());//parentName: jack
console.log('---------------');
console.log(Son.prototype.constructor == Son);//true
console.log(son instanceof Son);//true
console.log(son instanceof Parent);//true
console.log(son instanceof Object);//true

Son.prototype.getName = function() {
  return this.name + " has a good son";
}
console.log('---------------');
console.log('sonName: ' + son.getName());//sonName: undefiend has a ggod son
console.log('parentName: ' + parent.getName());//parentName:jack

xuanxiao2013 / f2e-practice

不调用构造方法实现继承的疑问 #4