js 原型添加方法

// 定义一个构造函数
function Person(name, age) {
  this.name = name;
  this.age = age;
}

// 向Person的原型添加一个方法
Person.prototype.sayHello = function() {
  console.log(`Hello, my name is ${this.name} and I am ${this.age} years old.`);
};

// 创建一个Person实例
const person1 = new Person('Alice', 30);

// 调用原型上的方法
person1.sayHello(); // 输出: Hello, my name is Alice and I am 30 years old.

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

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

const person1 = new Person('Alice', 30);
person1.sayHello(); // 输出: Hello, my name is Alice and I am 30 years old.