save project

snake.py

@@ -61,10 +61,11 @@ while True:
         num2=random.randint(1,16)
         apple_x=30*num1-30
         apple_y=30*num2-30
-        score+=10
+        score+=5
     else:
         position.pop(0)
-    
+    if x>630 or y>450 or x<0 or y<0:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去