This function will create a new, empty, room and add it to your game, returning its index to be stored in a variable for all further codes that deal with this room. Note that each room is permanently added to the game until the executable is closed, ie: rooms added through code cannot be deleted again. This has important implications for memory use and so you should use this function with care.NOTE: New rooms are not part of usual room ordering, so they do not have a "previous" or "next" room (meaning that the functions room_next and room_previous will not work). To jump from the added room to another, you must use the index of the room itself.重要！该函数在试用版（Trial License）产品中不可用。
global.myroom = room_add();
This will create a new room and store its index in the variable "global.myroom". It will then set its width to 640 pixels, its height to 480 pixels, and its persistence to false.