JavaScript工厂模式详解

//篮球基类var Basketball = function() {    this.intro = '篮球盛行于美国';}Basketball.prototype = {    getMember: function() {        console.log('每个队伍需要五个队员');    },    getBallSize: function() {        console.log('篮球很大');    }}//足球基类var Football = function() {    this.intro = '足球在世界范围内都很流行';}Football.prototype = {    getMember: function() {        console.log('每个队伍需要11名队员');    },    getBallSize: function() {        console.log('足球很大');    }}//运动工厂var SportsFactory = function(name) {    switch (name) {        case 'NBA':            return new Basketball();        case 'worldCup':            return new Football();    }}//当你需要为世界杯创建一个足球的时候，只需要记住运功工厂sportsFactory即可，调用并创建var Footnall = SportsFactory('worldCup');console.log(Footnall);console.log(Footnall.intro);Footnall.getMember();

//工厂模式function createBook(name, time, type) {    var o = new Object(); //创建一个对象，并对对象拓展属性和方法    //这是不相似的部分    o.name = name; //书本名称    o.time = time; //书本出版时间    o.type = type; //书本类型    //下面是相似的部分    o.getName = function() {        console.log(this.name);    };    //将对象返回    return o;}//创建两本书var book1 = new createBook('JS book', 2021, 'js');var book2 = new createBook('CSS book', 2019, 'css');book1.getName();book2.getName();

var Demo = function() {}Demo.prototype = {    show: function() {        console.log('成功获取');    }}var d = new Demo();//正确创建实例d.show(); //成功获取var d = Demo();//错误创建实例d.show(); //炸裂

var Demo = function() {    if (!this instanceof Demo) {//判断this的指向        return new Demo();    }}Demo.prototype = {    show: function() {        console.log('安全模式类真好用');    }}var d = Demo();d.show();

//安全模式创建工厂类var Factory = function(type, content) {    if (this instanceof Factory) {        var s = new this[type](content);        return s;    } else {        return new Factory(type, content);    }}//工厂原型中设置创建所有类型数据对象的基类Factory.prototype = {    java: function(content) {        //...    },    UI: function(content) {        this.content = content;        (function() {            var div = document.createElement('div');            div.innerHTML = content;            div.style.border = '1px soild red';            document.getElementById('container').appendChild(div);        })(content);    },    php: function(content) {        //...    },    javascript: function(content) {        //..    }};//创建对象var data = [    { type: 'javascript', content: 'js哪家强' },    { type: 'java', content: 'java哪家强' },    { type: 'UI', content: 'UI哪家强' }];for (let index = 0; index < data.length; index++) {    console.log(data[index].type);    Factory(data[index].type, data[index].content);}

var Car = function() {}Car.prototype = {    getPrice: function() {        return new Error('抽象方法不能调用');    },    getSpeed: function() {        return new Error('抽象方法不能调用');    }};

//抽象工厂方法var VehicleFactory = function(subType, superType) {    //判断抽象工厂中是否有该抽象类    if (typeof VehicleFactory[superType] === 'function') {        //缓存类        function F() {};        //继承父类属性和方法        F.prototype = new VehicleFactory[superType]();        //将子类constructor指向子类        subType.constructor = subType;        //子类原型继承父类        subType.prototype = new F();    } else {        //不存在该抽象类则抛错        throw new Error('未创建该抽象类');    }};//小汽车抽象类VehicleFactory.Car = function() {    this.type = 'car';}VehicleFactory.Car.prototype = {    getPrice: function() {        return new Error('抽象方法不能调用');    },    getSpeed: function() {        return new Error('抽象方法不能调用');    }};//公交车抽象类VehicleFactory.Bus = function() {    this.type = 'bus';}VehicleFactory.Bus.prototype = {    getPrice: function() {        return new Error('抽象方法不能调用');    },    getPassengerNum: function() {        return new Error('抽象方法不能调用');    }}

//抽象与实现//宝马汽车子类var BMW = function(price, speed) {    this.price = price;    this.speed = speed;};//抽象工厂实现对Car抽象类的继承VehicleFactory(BMW, 'Car');BMW.prototype.getPrice = function() { //重写方法    return this.price;}BMW.prototype.getSpeed = function() {    return this.speed;};//宇通公交车子类var YUTONG = function(price, passenger) {    this.price = price;    this.passenger = passenger;};//抽象工厂实现对BUS抽象类的继承VehicleFactory(YUTONG, 'Bus');YUTONG.prototype.getPrice = function() {    return this.price;}YUTONG.prototype.getPassengerNum = function() {    return this.passenger;};//实例化类var myBMW = new BMW('100w', '1000km/h');console.log(myBMW.getPrice(), myBMW.getSpeed(), myBMW.type);