save project

snake.py

@@ -58,8 +58,11 @@ while True:
         num2 =random.randint(1,16)
         apple_x = 30*num1-30
         apple_y = 30*num2-30
+        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