【風趣的解釋】

Builder Mode

有時候帶著MM去約會，KFC可能也是一個不錯的約會地點，進去我們常常點上兩個套餐，然后很happy的聊上一兩個小時。有沒有發現我們的選的套餐，都基本上是包括一個主食，幾個輔食，一杯飲料呢？我們選好套餐，交了錢，收銀員就把單子交給里面的師傅，然后師傅按照主食、輔食、飲料的順序把食物放到盤子里（順序可能有所不同，就暫且假設他們這樣做吧），這其實就是一個建造者模式。

【正式的解釋】

建造者模式

當面臨“一個復雜對象”的創建工作，其通常由各個部分的子對象用一定的算法構成；由于需求的變化，這個復雜對象的各個部分經常面臨著劇烈的變化，但是將它們組合在一起的算法確相對穩定。

【Python版】

#-*- coding:utf-8 -*-

#套餐A
class MealA(object):
    def mainFood(self):
        print "main food is ready."
    def sideFood(self):
        print "side food is ready."
    def drink(self):
        print "drink is ready."

#套餐B
class MealB(object):
    def mainFood(self):
        print "main food is ready."
    def sideFood(self):
        print "side food is ready."
    def drink(self):
        print "drink is ready."

#服務生
class Waiter(object):
    def deliver(self, meal):
        meal.mainFood()
        meal.sideFood()
        meal.drink()

if __name__ == "__main__":
    waiter = Waiter()
    waiter.deliver(MealA())

"""print out

main food is ready.
side food is ready.
drink is ready.
"""

【JS版】

//套餐A
function MealA(){
    
}
MealA.prototype = {
    mainFood: function(){
        console.log("main food is ready.");
    },
    sideFood: function(){
        console.log("side food is ready.");
    },
    drink: function(){
        console.log("drink food is ready.");
    }
}

//套餐B
function MealB(){
    
}
MealB.prototype = {
    mainFood: function(){
        console.log("main food is ready.");
    },
    sideFood: function(){
        console.log("side food is ready.");
    },
    drink: function(){
        console.log("drink food is ready.");
    }
}

//服務生
function Waiter(){

}
Waiter.prototype.deliver = function(meal){
    meal.mainFood();
    meal.sideFood();
    meal.drink();
};

waiter = new Waiter();
waiter.deliver(new MealA());

/*console out

main food is ready.
side food is ready.
drink food is ready.
*/