save project

snake.py

@@ -55,8 +55,10 @@ while True:
         y += 30
     if x==apple_x and y==apple_y:
         apple_x,apple_y=random.randint(0,22)*30,random.randint(0,16)*30
+    else:
+        position.pop(0)
     position.append((x, y))
-    position.pop(0)
+    
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -68,4 +70,4 @@ while True:
     screen.blit(food,(apple_x,apple_y))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(15)
\ No newline at end of file
+    FPSCLOCK.tick(10)
\ No newline at end of file