save project

snake.py

@@ -58,15 +58,16 @@ while True:
         y += 30
     position.append((x, y))
     if x==apple_x and y==apple_y:
-        apple_x=random.randint(0,660)
-        apple_y=random.randint(0,480)
         num1=random.randint(0,21)
         num2=random.randint(0,15)
         apple_x=num1*30
         apple_y=num2*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])