SOURCE

var Beverage = function(){}

		Beverage.prototype.boilWater = function(){
			console.log("把水煮沸")
		}
		Beverage.prototype.brew = function(){}
		Beverage.prototype.pourInCup = function(){}
		Beverage.prototype.addCondiments = function(){}

		Beverage.prototype.init = function(){
			this.boilWater


			this.brew();
			this.pourInCup();
			this.addCondiments();
		}

		var Coffee = function(){}

		Coffee.prototype = new Beverage();

		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 Coffee = new Coffee();
		Coffee.init()

		var Tea = function(){}

		Tea.prototype = new Beverage();

		Tea.prototype.brew = function(){
			console.log("用沸水冲泡茶叶")
		}
		Tea.prototype.pourInCup = function(){
			console.log("把茶水倒进杯子")
		}
		Tea.prototype.addCondiments = function(){
			console.log("加柠檬")
		}

		var tea = new Tea();
		tea.init()