//构造函数(constructor function)
//两种实现方法：原型(prototype)、ES6的类(class)

//构造函数首字母要大写

function Person(firstName, lastName, dob){
    this.firstName = firstName;
    this.lastName = lastName;
    this.dob = new Date(dob);
}
Person.prototype.getBirthYear = function(){
    return this.dob.getFullYear();
}
Person.prototype.getFullName = function(){
    return `${this.firstName}.${this.lastName}`;
}

//实例化对象Instantiate object

const person1 = new Person('John', 'Doe', '4-3-1980');
const person2 = new Person('Marry', 'Smith', '5-5-1978');
console.log(person1);
console.log(person2.getFullName());
console.log(person2.getBirthYear());//1978 Date中的自带

/**console.log(person1);

• 调试器输出：
  Person {firstName: 'John', lastName: 'Doe', dob: Thu Apr 03 1980 00:00:00 GMT+0800 (中国标准时间)}
  dob: Thu Apr 03 1980 00:00:00 GMT+0800 (中国标准时间) {}
  firstName: "John"
  lastName: "Doe"
  [[Prototype]]: Object
  getBirthYear: ƒ ()
  getFullName: ƒ ()
  constructor: ƒ Person(firstName, lastName, dob)
  [[Prototype]]: Object
  */

//类方法实现对象：

class Student {
    //类中的方法叫做constructor
    constructor(firstName, lastName, dob){
        this.firstName = firstName;
        this.lastName = lastName;
        this.dob = new Date(dob);
    }

    getBirthYear(){
        return this.dob.getFullYear();
    }

    getFullName(){
        return `${firstName}.${lastName}`
    }
}