node.js如何实现装饰者模式

这次给大家带来node.js如何实现装饰者模式，node.js实现装饰者模式的注意事项有哪些，下面就是实战案例，一起来看一下。

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());

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