save project

snake.py

@@ -62,6 +62,8 @@ while True:
         apple_y = 30*num2 - 30
     else:
         position.pop(0)
+    if x < 0 or x > 630 or y < 0 or y > 450:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0,0))
     # 将贪吃蛇的头画上去
@@ -76,4 +78,4 @@ while True:
     screen.blit(text ,(540,10))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(10)
\ No newline at end of file
+    FPSCLOCK.tick(8)
\ No newline at end of file