常用的JavaScript设计模式（二）Factory(工厂)模式

//Car和Trunk的构造函数
function Car(options){
    this.doors=options.doors||4;
    this.state=options.state||"brand new";
    this.color=options.color||"black";
}
function Trunk(options){
    this.wheelSize=options.wheelSize||‘large‘;
    this.color=options.color||"yellow";
    this.state=options.state||"brand new";
}
//定义VehicleFactory工厂
function VehicleFactory(){}
//定义工厂创建实例的方法
VehicleFactory.prototype.createVehicle=function (options){
    switch(options.vehicleType)
    {
        case "car":this.vehicleClass=Car;break;
        case "trunk":this.vehicleClass=Trunk;break;
    }
    return new this.vehicleClass(options);
};

//创建生成汽车的工厂实例
let carFactory=new VehicleFactory();
let car1=carFactory.createVehicle({
                vehicleType:"car",
                color:"white",
                doors:6});
console.log(car1);//{doors:6,state:"brand new",color:"white"}