通过函数和使用方法创建对象，而不将对象存储在变量中

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

// 创建对象
var person1 = new Person("John", 25);
var person2 = new Person("Jane", 30);

// 调用对象的方法
person1.sayHello(); // 输出：Hello, my name is John
person2.sayHello(); // 输出：Hello, my name is Jane

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

// 创建对象
var person1 = createPerson("John", 25);
var person2 = createPerson("Jane", 30);

// 调用对象的方法
person1.sayHello(); // 输出：Hello, my name is John
person2.sayHello(); // 输出：Hello, my name is Jane

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

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

// 创建对象
var person1 = new Person("John", 25);
var person2 = new Person("Jane", 30);

// 调用对象的方法
person1.sayHello(); // 输出：Hello, my name is John
person2.sayHello(); // 输出：Hello, my name is Jane