There isn't much to handling the pressing of control keys (Shift, Alt, and Ctrl). You need to ignore these keyboard events by doing the following.
对于控制键(Shift、Alt和Ctrl)的按键事件并不需要过多的处理。
Additionally, to further expand on game control functions, modifier keys are used in conjunction with other keyboard keys to serve as shortcut keys for activating such game control functions.
此外，为了进一步扩展游戏控制功能，与其它键盘按键相配合地使用辅助按键以作为启动这种游戏控制功能的快捷键。
The keyboard keys to control the direction snakeheads movement direction;
用键盘方向键控制蛇头运动方向；
The keyboard keys to control the direction snakeheads movement direction;
用键盘方向键控制蛇头运动方向；
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