20170422

代码说明：

  贪吃蛇游戏是经典手机游戏，既简单又耐玩。通过控制蛇头方向吃蛋，使得蛇变长，从而获得积分。(Snake game is a classic mobile phone game, which is simple and playable. By controlling the direction snakeheads eat eggs, the snake long, so as to obtain the integral.)