/*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 key adjusted for height and speed, press the Enter Key started the game * / / * process of the game Return to Zantingjian ESC key to withdraw from the key * /