Enumeration members
JOIN_ROOM_FAIL_ALREADY_JOINED_ROOM
JOIN_ROOM_FAIL_ALREADY_JOINED_ROOM: = 3
JOIN_ROOM_FAIL_CONTENT
JOIN_ROOM_FAIL_CONTENT: = 1
JOIN_ROOM_FAIL_ROOM_DOES_NOT_EXIST
JOIN_ROOM_FAIL_ROOM_DOES_NOT_EXIST: = 2
JOIN_ROOM_SUCCESS
JOIN_ROOM_SUCCESS: = 0
JoinRoom 결과 코드.