Typescript作用域扩充对象

interface IPerson {
  name: string;
  age: number;
  sayHello(): void;
}

class Person implements IPerson {
  name: string;
  age: number;

  constructor(name: string, age: number) {
    this.name = name;
    this.age = age;
  }

  sayHello() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }
}

const person = new Person("John", 25);
person.sayHello(); // Output: Hello, my name is John and I'm 25 years old.

class Animal {
  name: string;

  constructor(name: string) {
    this.name = name;
  }

  eat() {
    console.log(`${this.name} is eating.`);
  }
}

class Dog extends Animal {
  breed: string;

  constructor(name: string, breed: string) {
    super(name);
    this.breed = breed;
  }

  bark() {
    console.log(`${this.name} is barking.`);
  }
}

const dog = new Dog("Max", "Labrador");
dog.eat(); // Output: Max is eating.
dog.bark(); // Output: Max is barking.

class Logger {
  log(message: string) {
    console.log(`[Log]: ${message}`);
  }
}

class Person {
  name: string;

  constructor(name: string) {
    this.name = name;
  }
}

interface Person extends Logger {} // 使用接口将Logger混入Person类

const person = new Person("John");
person.log("Hello, TypeScript!"); // Output: [Log]: Hello, TypeScript!