js的工廠模式旨在於能夠新建一個工廠，從工廠中生產出所需要的類，可以解決一些複雜場景：

class person {
  constructor(name) {
    this.type = "人";
    this.name = name;
  }
}

class man extends person {
  constructor(name) {
    super(name);
    this.sex = "男";
  }
}
class woman extends person {
  constructor(name) {
    super(name);
    this
 
.sex = "女";
  }
}

// 工廠類
function Factory() {
  // 設計一個儲存物件各種物件的資料
  this.empDict = {};
  this.addEmpObj = function (key, obj) {
    if (!this.empDict[key]) this.empDict[key] = obj;
  };
  this.createEmp = function () {
    var key = Array.prototype.shift.call(arguments);
    if (!key || !this.empDict[key]) throw
 
 new Error("沒有找到指定物件");

    let n_obj = new this.empDict[key](...arguments);
    // 用工廠類給物件賦予一個公共的方法
    n_obj.say = function () {
      console.log("我的名字是：", this.name,"--我們的口號是：今天睡地板，明天當老闆！");
    };
    return n_obj;
  };
}

let fa = new Factory();
fa.addEmpObj("man", man);// 將男人類放到工廠中
fa.addEmpObj("woman", woman);//
 
 將女人類放到工廠中

let cc = fa.createEmp("man", "xcc");
cc.say();

let jh = fa.createEmp("woman", "djh");
jh.say();