循环元素并检查类在vanilla javascript中的子类

// 定义一个父类
class Animal {
  constructor(name) {
    this.name = name;
  }

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

// 定义一个子类
class Dog extends Animal {
  constructor(name) {
    super(name);
  }

  // 子类方法
  speak() {
    console.log(`${this.name} barks.`);
  }
}

// 定义一个子类
class Cat extends Animal {
  constructor(name) {
    super(name);
  }

  // 子类方法
  speak() {
    console.log(`${this.name} meows.`);
  }
}

// 创建父类实例
const animal = new Animal('Animal');
animal.speak(); // 输出: Animal makes a noise.

// 创建子类实例
const dog = new Dog('Dog');
dog.speak(); // 输出: Dog barks.

const cat = new Cat('Cat');
cat.speak(); // 输出: Cat meows.

// 检查类是否是子类
function isSubclass(childClass, parentClass) {
  return childClass.prototype instanceof parentClass;
}

console.log(isSubclass(Dog, Animal)); // 输出: true
console.log(isSubclass(Cat, Animal)); // 输出: true
console.log(isSubclass(Animal, Dog)); // 输出: false
console.log(isSubclass(Animal, Cat)); // 输出: false