save project

snake.py

@@ -62,10 +62,12 @@ while True:
         num2 = random.randint(1,16)
         apple_x = num1 * 30 - 30
         apple_y = num2 * 30 - 30
+        score += 10
     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])