if not existed:
Courtesy of Best Buy
，更多细节参见夫子
That’s helpful for me here, though, because it means that I already have a bunch of routines handy that will do things like compute where, exactly, on the screen the cell is corresponding to the move the player just made, and it also means that the rest of the game logic is already such that I can rely on screen memory holding the most up-to-date information I need.
behavior. For this reason, I would make the