js 子类继承父类demo

// 父类
class Animal {
  constructor(name) {
    this.name = name;
  }

  speak() {
    console.log(`${this.name} makes a noise.`);
  }
}

// 子类
class Dog extends Animal {
  constructor(name, breed) {
    super(name); // 调用父类的构造函数
    this.breed = breed;
  }

  speak() {
    console.log(`${this.name} barks.`);
  }

  getBreed() {
    console.log(`The dog is a ${this.breed}.`);
  }
}

// 创建实例
const dog = new Dog('Buddy', 'Golden Retriever');
dog.speak(); // 输出: Buddy barks.
dog.getBreed(); // 输出: The dog is a Golden Retriever.

class Dog extends Animal {
  constructor(name, breed) {
    super(name); // 确保调用super()
    this.breed = breed;
  }
}

class Dog extends Animal {
  speak() {
    super.speak(); // 调用父类的speak方法
    console.log(`${this.name} barks.`);
  }
}