（1）利用方向键来改变蛇的运行方向。

（2）空格键暂停或继续游戏，并在随机的地方产生食物。

（3）吃到食物就变成新的蛇体，碰到壁或自身则游戏结束，否则正常运行。

-(1) Use the arrow keys to change the direction of the snake. (2) the spacebar to pause or resume the game, and produce food in random places. (3) eat food becomes the new snake body, hit the wall or the end of the game itself, otherwise normal operation.