ES6 新特性（五）

// ES5通过构造函数实例化对象function Phone(brand, price) {  this.brand = brand;  this.price = price;}Phone.prototype.call = function() {  console.log('I can call!');}//实例化对象let huawei = new Phone('Huawei', 5999);huawei.call(); // I can call!console.log(huawei);
// ES6通过类实例化对象class Phone{  constructor(brand, price) {    this.brand = brand;    this.price = price;  }  call() {    console.log('I can call!');  }}let onePlus = new Phone('onePlus', 2999);console.log(onePlus);

class Phone{  static size = '5.5inch';  static change() {    console.log('I can change the world');  }}let xiaomi = new Phone();console.log(Phone.size); // 5.5inchPhone.change(); // I can change the worldconsole.log(xiaomi.size); // undefinedxiaomi.change(); // Uncaught TypeError: xiaomi.change is not a function

// 手机function Phone(brand, price) {  this.brand = brand;  this.price = price;}Phone.prototype.call = function() {  console.log('I can call!');}
// 智能手机function SmartPhone(brand, price, color, size) {  Phone.call(this, brand, price);  this.color = color;  this.size = size;}// 设置子构造函数的原型SmartPhone.prototype = new Phone;SmartPhone.constructor = SmartPhone; // 校正// 声明子类方法SmartPhone.prototype.phote = function() {  console.log('I can take photo');}SmartPhone.prototype.playGame = function() {  console.log('I can play game');}let meizu = new SmartPhone('meizu', 2999, 'black', '6.2inch');console.log(meizu); // 见【图1】

class Phone{  // 构造方法  constructor(brand, price) {    this.brand = brand;    this.price = price;  }  // 成员属性  call() {    console.log('I can call');  }}
class SmartPhone extends Phone{  // 构造方法  constructor(brand, price, color, size) {    super(brand, price);    this.color = color;    this.size = size;  }  photo() {    console.log('I can take photo');  }  playGame() {    console.log('I can play game');  }}let vivo = new SmartPhone('vivo', 1999, 'white', '6.8inch');console.log(vivo); // 见【图2】

class Phone{  get price() {    console.log('价格属性被读取了');    return '19999';  }  set price(newVal) {    console.log('价格属性被修改了')  }}let iPhone = new Phone();let price = iPhone.price; // 价格属性被读取了console.log(price); // 19999iPhone.price = 'free'; // 价格属性被修改了