save project

snake.py

@@ -64,6 +64,8 @@ while True:
     else:
         position.pop(0)
     # 将背景图画上去
+    if x < 0 or x > 630 or y < 0 or y>450:
+        exit()
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
     screen.blit(snake_head, position[-1])
@@ -78,4 +80,4 @@ while True:
     screen.blit(text,(540,10))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(3)
\ No newline at end of file
+    FPSCLOCK.tick(10)
\ No newline at end of file