工厂模式

factory.js

//工厂模式
function Factory () {}
Factory.prototype.defaultGender = Boy;
Factory.prototype.createFactory = function (options) {
  if (options.name === 'girl') {
    this.defaultGender = Girl;
  } else {
    this.defaultGender = Boy;
  }
  return new this.defaultGender(options);
}

var factory = new Factory();
var instance = factory.createFactory({name: 'boy'});


//抽象工厂模式
var factory = (function() {
  var types = {
    boy: Boy,
    girl: Girl
  };
  
  return {
    getClass: function(type, options) {
      if(type && types[type]) {
        var Gender = types[type];
        return (Gender) ? new Gender(options) : null;
      }
    }
  }; 
})();