node.js的exprots工厂模式

工厂类：

/**
 * Created by zzq on 2015/5/15.
 */
module.exports = function(){
    this.getProduct = function(){
        console.log('重写这个方法获得相应的产品对象！');
    }
}

产品A：

/**
 * Created by zzq on 2015/5/15.
 */
var product = require('./product');
var util = require('util');

var productA = function(){
    product.call(this);
    this.getProduct = function(){
        console.log('获得了产品A对象！');
    }
}

util.inherits(productA, product);

module.exports = productA;

产品B类与A写法相同。。。

简单产品工厂：

/**
 * Created by zzq on 2015/5/15.
 */
var productA = require('./productA');
var productB = require('./productB');

var _instance = null;

var productFactoryModule = function(){
    var productFactory = function(){

    }

    productFactory.prototype.selectProduct = function(type) {
        switch (type) {
            case 'productA':
            {
                return new productA();
            };break;
            case 'productB':
            {
                return new productB();
            };break;
        }
    }

    this.initProduct = function (type) {
        if(_instance === null){
            _instance = new productFactory();
        }
        return _instance.selectProduct(type);
    }
}

//控制Single
module.exports = productFactoryModule;

mainApp：

/**
 * Created by zzq on 2015/5/15.
 */

var productFactory = require('./productFactory');
var productA = new productFactory();
productA.initProduct('productA').getProduct();