如何使用对象中的方法增加对象的属性javascript

Question

调用makeBooking方法时，如何增加booked属性。 没有获得理想的结果，我在学习JavaScript时做错了什么。

 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) 

Answer 1

this.booked ++，当您将简单类型分配给变量时，它不会链接回原始属性

 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) 

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)

当您执行addbooking = this.booked然后递增addbooking时，它并不指向原始变量。

希望这会有所帮助。

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