题目

/*

1. 使用构造函数将电动汽车（称为 EV）作为 Car 的子 “类 ”来实现。除了品牌和当前速度外，EV 还具有当前电池电量（百分比）（“charge ”属性）；
2. 实现一个 “chargeBattery ”方法，该方法接收一个参数 “chargeTo”，并将电池电量设置为 “chargeTo”；
3. 执行一个 “accelerate ”方法，将汽车速度提高 20%，电量减少 1%。然后记录如下信息 BYD时速 140 公里，电量 22%"；
4. 创建一个电动汽车对象，并尝试调用 “加速”、“刹车 ”和 “充电”（充电至 90%）。注意 “加速 ”时会发生什么！提示：复习多态性的定义 😉
   数据车 1：“BYD”，时速 120 公里，电量 23
   祝你好运
   */

1

function Car(make, speed) {
  this.make = make;
  this.speed = speed;
}

const EV = function (make, speed, charge) {
  this.make = make;
  this.speed = speed;
  this.charge = charge;
};

2

function Car(make, speed) {
  this.make = make;
  this.speed = speed;
}

const EV = function (make, speed, charge) {
  this.make = make;
  this.speed = speed;
  this.charge = charge;
};

EV.prototype.chargeBattery = function (chargeTo) {
  this.charge = chargeTo;
};

3

function Car(make, speed) {
  this.make = make;
  this.speed = speed;
}

const EV = function (make, speed, charge) {
  this.make = make;
  this.speed = speed;
  this.charge = charge;
};

EV.prototype = Object.create(Car.prototype);

EV.prototype.chargeBattery = function (chargeTo) {
  this.charge = chargeTo;
};
Car.prototype.accelerate = function () {
  this.speed += 20;
  this.charge--;
  console.log(`BYD时速为${this.speed},电量剩余${this.charge}`);
};

const BYD = new EV('BYD', 120, 23);
BYD.accelerate();

4

//刹车
Car.prototype.brake = function () {
  this.speed -= 5;
  console.log(`${this.make}的速度已经达到${this.speed}`);
};

const EV = function (make, speed, charge) {
  this.make = make;
  this.speed = speed;
  this.charge = charge;
};

EV.prototype = Object.create(Car.prototype);

EV.prototype.chargeBattery = function (chargeTo) {
  this.charge = chargeTo;
};
Car.prototype.accelerate = function () {
  this.speed += 20;
  this.charge--;
  console.log(`BYD时速为${this.speed},电量剩余${this.charge}%`);
};

const BYD = new EV('BYD', 120, 23);
BYD.accelerate();
BYD.brake();
BYD.accelerate();