save project

snake.py

@@ -60,10 +60,11 @@ while True:
         num2 = random.randint(1,16)
         apple_x = num1*30 - 30
         apple_y = num2*30 - 30
-        score += 100
+        score += 1
     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