node.js实现的装饰者模式示例
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2022-07-03 19:37:48
本文实例讲述了node.js实现的装饰者模式。分享给大家供大家参考,具体如下:
装饰者模式的实现更强调类的组合而不是通过继承。这样可以增强灵活性。在node.js 中,可...
本文实例讲述了node.js实现的装饰者模式。分享给大家供大家参考,具体如下:
装饰者模式的实现更强调类的组合而不是通过继承。这样可以增强灵活性。在node.js 中,可以通过call函数实现。call函数可以在一个对象中调用另一个类的成员函数,从这种意义上达成类的组合目的。
var util = require('util'); var beverage = function(){ var description = "unkown beverage" this.getdescription = function(){ return description; } } function espresso(){ beverage.call(this); this.description = "espresso"; } util.inherits(espresso, beverage); espresso.prototype.cost = function(){ return 1.99; } function houseblend(){ beverage.call(this); this.description = "house blend coffee"; } util.inherits(houseblend, beverage); houseblend.prototype.cost = function(){ return .89; } function mocha(beverage){ this.beverage = beverage; }; mocha.prototype.getdescription = function(){ return this.beverage.getdescription() + ", mocha"; } mocha.prototype.cost = function(){ return 0.20 + this.beverage.cost(); } function whip(beverage){ this.beverage = beverage; }; whip.prototype.getdescription = function(){ return this.beverage.getdescription() + ", whip"; } whip.prototype.cost = function(){ return 0.40 + this.beverage.cost(); } var beverage = new espresso(); console.log(beverage.getdescription() + " $" + beverage.cost()); var beverage2 = new houseblend(); beverage2 = new mocha(beverage2); beverage2 = new mocha(beverage2); beverage2 = new whip(beverage2); console.log(beverage2.getdescription() + " $" + beverage2.cost());
希望本文所述对大家node.js程序设计有所帮助。
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