动态生成javascript对象的创造性方法

function createPerson(name, age) {
  return {
    name: name,
    age: age,
    sayHello: function() {
      console.log("Hello, my name is " + this.name);
    }
  };
}

var person1 = createPerson("John", 25);
person1.sayHello(); // 输出：Hello, my name is John

function Person(name, age) {
  this.name = name;
  this.age = age;
  this.sayHello = function() {
    console.log("Hello, my name is " + this.name);
  };
}

var person2 = new Person("Jane", 30);
person2.sayHello(); // 输出：Hello, my name is Jane

var person3 = {
  name: "Tom",
  age: 35,
  sayHello: function() {
    console.log("Hello, my name is " + this.name);
  }
};

person3.sayHello(); // 输出：Hello, my name is Tom

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

  sayHello() {
    console.log("Hello, my name is " + this.name);
  }
}

var person4 = new Person("Kate", 40);
person4.sayHello(); // 输出：Hello, my name is Kate