簡單工廠模式（simple Factory）：又叫靜態工廠方法，由一個工廠物件決定建立某一種產品物件類的例項。主要用來建立同一類物件。

舉個例子，比如說體育商品店賣體育器材，裡面有很多體育用品，及其相關介紹等，當你來到體育用品店賣一個籃球和它的相關介紹的時候，你只需要問售貨員，他會幫你找到你所需要的東西。

//basketball base class
var Baseketball = function(){
  this.intro = 'baseketball is hotting at unitedstates';
}
Baseketball.prototype = {
  getMember : function(){\
    console.log('each team needs five players');
  },
  getBallSize : function(){
    console.log('basketball is big');
  }
}
//football base class 
var Football = function(){
  this.intro = 'football is popular at all of the world';
}
Football = function(){
  getMember = function(){

  },
  getBallSize = function(){

  }
}
//sport factory
var SportsFactory = function(name){
  switch(name){
    case 'NBA':
      return new Baseketball();
    case 'wordCup':
      return new Football();
  }
}

//when you want football 
var football = SportsFactory('wordCup');
console.log(football);
console.log(football.intro);
football.getMember();