实现在正点原子的开发板上贪吃蛇的游戏，贪吃蛇通过吃到不同颜色的球球来增加自己的长度，吃到什么颜色他身体的哪部分就变为什么颜色(To achieve the game of snake on the development board of the point atom, the snake eats his balls of different colors to increase his length, and what color he eats and why his body chang