问测试一个对象在Javascript中的“兄弟类”的方法？

EN

class Pet {
  constructor(name) {
    this.name = name;
  }
}

class Cat extends Pet {
  sayHello() { console.log(`${this.name} miaows`) }
}

class Dog extends Pet {
  sayHello() { console.log(`${this.name} barks`) }
}

const goofy = new Dog('Pluto');
const garfield = new Cat('Garfield');

console.log(goofy.constructor.name);
console.log(garfield.constructor.name);
console.log(goofy instanceof Dog);
console.log(garfield instanceof Cat);