Javascript 构造函数与类课后作业

1类Vehicle，具有seats属性和drive方法

class Vehicle{
    constructor(seats){ this.seats=seats;}
    driver(){
        console.log("i am driving");
    }
}
kk = new Vehicle('ii');
console.log(kk.seats);
kk.driver();

或者：

class Vehicle{
    constructor(seats,driver){
        this.seats=seats;
        this.driver = driver;
    }
}
kk = new Vehicle('ii',function() {
console.log("iuiuiui");})
console.log(kk.seats);
kk.driver();

答案

ii
i am driving

其中第一种实现方法可以实现在类中定义方法，对象直接调用即可实现功能；第二种方法可以实现对象可以自己定义方法里面要实现的功能
2类Bus继承Vehicle，扩展了stops属性和charge方法`

class Bus extends Vehicle {
        constructor(stop) {
            super();
            this.stop = stop;
        }

        charge() {
            console.log("i will receive you really high")
        }
    }

3. 把上述类的写法⽤用构造函数的写法再实现一次
重写问题1的代码如下：

    function Vehicle(seats) {
        this.seats = seats;
        this.driver = function (way) {
            console.log(way);
        }
    }

    vihi = new Vehicle(9);
    console.log(vihi.seats)
    vihi.driver("riding");

重写问题2的代码如下：

function Bus(stops){
    this.stops = stops;
    this.charge = function(money){
        console.log("give me"+ ' '+money);
    }
}
Bus.prototype = {
     drive : function (way) {
        console.log(way);
    },
    seats:"oo"
}
bus = new Bus("right now");
console.log(bus.stops);
bus.charge("50$");
console.log(bus.seats);
bus.drive("riding");

答案为：

right now
give me 50$
oo
riding