before the start of the game with four direction keys adjust height and speed, p...

代码说明：

游戏开始前用四个方向键调整高度和速度，按回车键开始游戏 游戏过程中回车键为暂停键，ESC键为退出键-before the start of the game with four direction keys adjust height and speed, press the Enter key begin the process of the game"s keys to enter reversed, the ESC key to withdraw from the bond