用Qt实现的经典游戏俄罗斯方块，做的很简单，有速度控制，难度控制，开始/暂停/停止。但是没有做控制按钮，只有实现函数，有兴趣的朋友可以自己做控制按钮来操作。-With Qt to achieve the classic game Tetris, do a very simple, speed control, difficulty of control, start/pause/stop. But no control button, only to realize function, interested friends can make their own control buttons to operate.