属性值不能通过对象文字定义应用

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

var person = new Person("John", 25);
console.log(person.name); // 输出 "John"
console.log(person.age); // 输出 25

function createPerson(name, age) {
  var person = {};
  person.name = name;
  person.age = age;
  return person;
}

var person = createPerson("John", 25);
console.log(person.name); // 输出 "John"
console.log(person.age); // 输出 25

var person = {
  name: "",
  age: 0,
  setName: function(name) {
    this.name = name;
  },
  setAge: function(age) {
    this.age = age;
  }
};

person.setName("John");
person.setAge(25);
console.log(person.name); // 输出 "John"
console.log(person.age); // 输出 25