在ES6中将对象从一个类访问到另一个类

class Parent {
  constructor(name) {
    this.name = name;
  }
  
  sayHello() {
    console.log(`Hello, ${this.name}!`);
  }
}

class Child extends Parent {
  constructor(name) {
    super(name);
  }
}

const child = new Child("Alice");
child.sayHello(); // Output: Hello, Alice!

class Person {
  constructor(name) {
    this.name = name;
    this.address = new Address();
  }
  
  sayHello() {
    console.log(`Hello, ${this.name}!`);
  }
}

class Address {
  constructor() {
    this.city = "New York";
    this.country = "USA";
  }
  
  getAddress() {
    return `${this.city}, ${this.country}`;
  }
}

const person = new Person("Bob");
console.log(person.address.getAddress()); // Output: New York, USA

class MathUtils {
  static multiply(a, b) {
    return a * b;
  }
}

class Calculator {
  static calculate(a, b) {
    return MathUtils.multiply(a, b);
  }
}

console.log(Calculator.calculate(2, 3)); // Output: 6