save project

snake.py

@@ -54,11 +54,12 @@ while True:
     else:
         y += 30
     if apple_x==x and apple_y==y:
-        apple_x=random.randint(0,660)
-        apple_y=random.randint(0,480)
-
+        apple_x=random.randint(0,21)*30
+        apple_y=random.randint(0,15)*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
@@ -72,3 +73,4 @@ while True:
     # 刷新画面
     pygame.display.update()
     FPSCLOCK.tick(3)
+