/* 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();