JavaScript之工厂模式

JavaScript之工厂模式

/***************外js*********************///接口类，用来创建接口     var Interface = function (name) {        if (arguments.length != 2) {            throw new Error("创建的接口不符合标准，必须有两个参数，第二个参数是接口的方法");        }        this.name = name;        this.methods = [];        var methods = arguments[1];        for (var i = 0; i < methods.length; i++) {            this.methods.push(methods[i]);        }    }    Interface.ensureImplements = function (obj) {        if (arguments.length < 2) {            throw new Error("要检查的接口必须传入接口对象的参数，所以参数的个数必须大于等于2")        }        for (var i = 1; i < arguments.length; i++) {            var intObj = arguments[i];            if (intObj.constructor != Interface) throw new Error(intObj + "接口的对象不正确");            //检查方法是否符合要求            var cmethods = intObj.methods;            for (var j = 0; j < cmethods.length; j++) {                if (!obj[cmethods[j]] || typeof obj[cmethods[j]] != "function") throw new Error("必须实现：" + cmethods[j] + "这个方法");            }        }    };var ICar=new Interface("ICar",["assemble","wash","run"]);var Car = function(){};Car.prototype ={    assemble:function(){        alert("小车组装中");    },    wash:function(){        alert("小车清洗中");    },    run:function(){        alert("嘟嘟中");    }}var Truck = function(){};Truck.prototype ={    assemble:function(){        alert("大卡车组装中");    },    wash:function(){        alert("大卡清洗中");    },    run:function(){        alert("轰隆隆");    }}var HongYong = {};HongYong.CarFactory = {    createCar:function(model){        var car;        switch(model){            case "car":                car =new Car();            break;            case "truck":                car =new Truck();            break;        }        Interface.ensureImplements(car,ICar);        return car;    }};var CarShop = function(){};CarShop.prototype = {    sellCar:function(model){        var car =HongYong.CarFactory.createCar(model);        car.assemble();        car.wash();        return car;    }};var c=new CarShop().sellCar("truck");c.run();