半颗星的分析

var Beverage = function(){};
Beverage.prototype.boilWater=function(){
    console.log("把水煮沸")
};
Beverage.prototype.brew=function(){
    throw new Error('子类必须重写该方法');
};
Beverage.prototype.pourInCup=function(){
    throw new Error('子类必须重写该方法');
};
Beverage.prototype.addCondiments=function(){
    throw new Error('子类必须重写该方法');
};
Beverage.prototype.customerWantsCondiments=function(){
    return true;
};
Beverage.prototype.init=function(){
    this.boilWater()
    this.brew()
    this.pourInCup()
    if(this.customerWantsCondiments()){
        this.addCondiments()
    }
};
var Coffee= function(){};
Coffee.prototype.brew=function(){
    console.log("用沸水冲泡咖啡")
};
Coffee.prototype.pourInCup=function(){
    console.log("把咖啡倒进杯子")
};
Coffee.prototype.addCondiments=function(){
    console.log("加糖和牛奶")
};

var Tea=function(){};
Tea.prototype.brew=function(){
    console.log("用沸水浸泡茶叶")
};
Tea.prototype.pourInCup=function(){
    console.log("把茶水倒进杯子")
};
Tea.prototype.addCondiments=function(){
    console.log("加柠檬")
};
//泡一杯不加调料的茶
Tea.prototype.customerWantsCondiments=function(){
    return window.confirm("请问需要加调料嘛？")
//return false;
};
Coffee.prototype=new Beverage;
Tea.prototype=new Beverage;
var coffee=new Coffee();
coffee.init();
var tea=new Tea();
tea.init();

点亮半颗星的原理分析

原理点亮半颗星