/* 抽象父類：飲料 */var Beverage = function(){};// (1) 把水煮沸Beverage.prototype.boilWater = function() {  console.log("把水煮沸");};// (2) 沸水浸泡Beverage.prototype.brew = function() {  throw new Error("子類必須重寫brew方法");};// (3) 倒進(jìn)杯子Beverage.prototype.pourInCup = function() {  throw new Error("子類必須重寫pourInCup方法");};// (4) 加調(diào)料Beverage.prototype.addCondiments = function() {  throw new Error("子類必須重寫addCondiments方法");};/* 模板方法 */Beverage.prototype.init = function() {  this.boilWater();  this.brew();  this.pourInCup();  this.addCondiments();}/* 實(shí)現(xiàn)子類 Coffee*/var Coffee = function(){};Coffee.prototype = new Beverage();// 重寫非公有方法Coffee.prototype.brew = function() {  console.log("用沸水沖泡咖啡");};Coffee.prototype.pourInCup = function() {  console.log("把咖啡倒進(jìn)杯子");};Coffee.prototype.addCondiments = function() {  console.log("加牛奶");};var coffee = new Coffee();coffee.init();

/* 添加鉤子方法 */Beverage.prototype.customerWantsCondiments = function() {  return true;};Beverage.prototype.init = function() {  this.boilWater();  this.brew();  this.pourInCup();  if(this.customerWantsCondiments()) {    this.addCondiments();  }}/* 實(shí)現(xiàn)子類 Tea*/var Tea = function(){};Tea.prototype = new Beverage();// 重寫非公有方法Tea.prototype.brew = function() {  console.log("用沸水沖泡茶");};Tea.prototype.pourInCup = function() {  console.log("把茶倒進(jìn)杯子");};Tea.prototype.addCondiments = function() {  console.log("加牛奶");};Tea.prototype.customerWantsCondiments = function() {  return window.confirm("需要添加調(diào)料嗎？");};var tea = new Tea();tea.init();