如何实例化不同的函数

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

var person1 = new Person("John", 25);
var person2 = new Person("Jane", 30);

function createPerson(name, age) {
  return {
    name: name,
    age: age
  };
}

var person1 = createPerson("John", 25);
var person2 = createPerson("Jane", 30);

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

var person1 = new Person("John", 25);
var person2 = new Person("Jane", 30);