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第一次尝试这种风格写代码，感觉蛮不错的
这种代码的设计风格实现起来就很舒服
第一题实现：
class Car { constructor(number, name) { this.number = number this.name = name } } class Kuaiche extends Car { constructor(number, name) { super(number, name) this.price = 1 } } class Zhuanche extends Car { constructor (number, name) { super(number, name) this.price = 2 } } class Trip { constructor(car) { this.car = car } start () { console.log(`开始行程，显示车辆信息:号码->${this.car.number},车名->${this.car.name}`) } end () { console.log(`结束行程，显示金额:${this.car.price * 5}`) } } let car = new Kuaiche(110, '本田') let trip = new Trip(car) trip.start() trip.end() 
第二题实现：
class Park { constructor(floors) { this.camera = new Camera this.screen = new Screen this.floors = floors || [] this.carList = {} } in (car) { // 通过摄像头获取信息 const info = this.camera.shot(car) // 停到某个停车位 const i = parseInt(Math.random()*100) const place = this.floors[0].places[i] place.in() info.place = place this.carList[car.number] = info } out (car) { //获取信息 const info = this.carList[car.number] // 将停车位清空 const place = info.place place.out() // 显示时间 this.screen.show(car, info.inTime) delete this.carList[car.number] } // 停车场总共还有多少个空的车位 emptyPlaceNum (floors) { return this.floors.map((floor) => { return `第${floor.index}层还有${floor.emptyPlaceNum()}个空车位` }).join('\n') } } class Floor { constructor(index, places) { //index表示第几层 this.index = index this.places = places || [] } emptyPlaceNum() { let count = 0 for (let i=0;i<this.places.length;i++){ if (this.places[i].empty) { count+=1 } } // console.log(count) return count // let num = 0 // this.places.forEach(p => { // if (p.empty) { // num = num + 1 // } // }) // return num } } class Place { constructor() { this.empty = true } in () { // console.error('进来了') this.empty = false } out() { this.empty = true } } class Camera { shot(car) { return { num: car.number, inTime: Date.now() } // console.log(`车牌号:${car.number}`) // console.log(`进入时间:${new Date().getTime()}`) } } class Screen { show(car, inTime) { console.log(`车牌号:${car.number}`) console.log(`该车辆停留的时间为:${Date.now() - inTime}`) } } class Car { constructor(number) { this.number = number } } // 测试 // 初始化停车场 const floors = [] for (let i=0;i<3;i++){ const places = [] for (let j=0;j<100;j++) { places[j] = new Place() } floors[i] = new Floor(i+1, places) } const park = new Park(floors) const car1 = new Car(100) const car2 = new Car(110) const car3 = new Car(200) console.log('第一辆车进入') console.log(park.emptyPlaceNum()) park.in(car1) console.log('----------------') console.log('第二辆车进入') console.log(park.emptyPlaceNum()) park.in(car2) console.log('----------------') console.log('第一辆车离开') park.out(car1) console.log('----------------') console.log('第二辆车离开') park.out(car2) console.log('----------------') console.log('第三辆车进入') park.in(car3) console.log('----------------') console.log('第三辆车离开') console.log(park.emptyPlaceNum()) park.out(car3) 文章来源: https://blog.csdn.net/yexudengzhidao/article/details/89874089