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。