save project

snake.py

@@ -27,9 +27,10 @@ while True:
             exit()
     x +=30
     positon.append((x,y))
+    positon.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
-    # 将贪吃蛇画上去
+    # 将贪吃蛇头画上去
     screen.blit(right, (x, y))
     # 将贪吃蛇的身体画上去
     for i in range(len(positon)-1):