Question

当调用makeBooking方法时，如何让预订的属性增加。没有得到理想的结果，我在学习JavaScript时做错了什么。

＆＃13;

var hotel = {
  name: "pacific",
  rooms: 40,
  bookings: 35,
  booked: 30,
  roomType: ['deluxe', 'double', 'suite'],
  pool: true,
  gym: true,
  checkAvailability: function() {
    return this.rooms - this.booked;
  },
  makeBooking: function() {
    var roomSpace = this.checkAvailability();
    var addBooking = this.booked;
    if (roomSpace > 0) {
      addBooking = addBooking++;
      console.log('room has been booked');
    } else {
      console.log('no room available');
    }
  }
};


console.log(hotel.checkAvailability());


var roomTypePush = hotel.roomType;
roomTypePush.push('rental');
console.log(roomTypePush);

console.log(hotel.booked);

console.log(hotel.makeBooking());

console.log(hotel.booked)

＆＃13;

Answer 1

this.booked ++，当你将一个简单类型设置为变量时，它不会链接回原始属性

＆＃13;

var hotel = {
  name: "pacific",
  rooms: 40,
  bookings: 35,
  booked: 30,
  roomType: ['deluxe', 'double', 'suite'],
  pool: true,
  gym: true,
  checkAvailability: function() {
    return this.rooms - this.booked;
  },
  makeBooking: function() {
    var roomSpace = this.checkAvailability();
   
    if (roomSpace > 0) {
      this.booked++;
      console.log('room has been booked');
    } else {
      console.log('no room available');
    }
  }
};


console.log(hotel.checkAvailability());


var roomTypePush = hotel.roomType;
roomTypePush.push('rental');
console.log(roomTypePush);

console.log(hotel.booked);

console.log(hotel.makeBooking());

console.log(hotel.booked)

＆＃13;

Answer 2

请使用此代码段。

var hotel = {
  name: "pacific",
  rooms: 40,
  bookings: 35,
  booked: 30,
  roomType: ['deluxe', 'double', 'suite'],
  pool: true,
  gym: true,
  checkAvailability: function() {
    return this.rooms - this.booked;
  },
  makeBooking: function() {
    var roomSpace = this.checkAvailability();
    var addBooking = this.booked;

    if (roomSpace > 0) {

      addBooking = this.booked++
      console.log('room has been booked');
    } else {
      console.log('no room available');
    }
   }
};


console.log(hotel.checkAvailability());


var roomTypePush = hotel.roomType;
roomTypePush.push('rental');
console.log(roomTypePush);

console.log(hotel.booked);

console.log(hotel.makeBooking());

console.log(hotel.booked)

当你执行addbooking = this.booked然后增加addbooking时，它不会指向原始变量。

希望这会有所帮助。

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2 个答案: