這次帶給大家node.js如何實作裝飾者模式，node.js實作裝飾者模式的注意事項有哪些，以下就是實戰案例，一起來看一下。
裝飾者模式的實作更強調類別的組合而不是透過繼承。這樣可以增強靈活性。在node.js 中，可以透過call函數實作。 call函數可以在一個物件中呼叫另一個類別的成員函數，從這種意義上達成類別的組合目的。
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());我相信看了本文案例你已經掌握了方法，更多精彩請關注php中文網其它相關文章！
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