如何连接两个类或从DOM打印一个类

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

  printName() {
    console.log(this.name);
  }
}

class ChildClass extends ParentClass {
  constructor(name, age) {
    super(name);
    this.age = age;
  }

  printAge() {
    console.log(this.age);
  }
}

const child = new ChildClass("John", 25);
child.printName(); // 输出 "John"
child.printAge(); // 输出 25

class Printer {
  print(message) {
    System.out.println(message);
  }
}

class DOM {
  constructor() {
    this.printer = new Printer();
  }

  printDOM() {
    this.printer.print("Printing DOM...");
  }
}

DOM dom = new DOM();
dom.printDOM(); // 输出 "Printing DOM..."

interface IPrintable {
  void Print();
}

class Printer : IPrintable {
  public void Print() {
    Console.WriteLine("Printing...");
  }
}

class DOM : IPrintable {
  public void Print() {
    Console.WriteLine("Printing DOM...");
  }
}

IPrintable printable = new Printer();
printable.Print(); // 输出 "Printing..."

printable = new DOM();
printable.Print(); // 输出 "Printing DOM..."