save project

snake.py

@@ -63,8 +63,11 @@ while True:
         num2 = random.randint (1,16)
         apple_x = 30*num1-30
         apple_y = 30*num2-30
+        score+=10
     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