save project

my_game.py

@@ -23,6 +23,7 @@ y = 400
 jumpState = "runing"
 t = 30
 road_x = 0
+bg_x = 0
 obstacle = random.choice([bush, stone, cacti])
 rect = obstacle.get_rect()
 rect.x = 1000
@@ -59,7 +60,10 @@ while True:
         if index >= 5:
             index = 0
     # 将背景图画上去
-    screen.blit(background, (0, 0))
+    bg_x -= 1
+    if bg_x <=-1000:
+        bg_x = 0
+    screen.blit(background, (bg_x, 0))
     road_x -= 8
     if road_x <=-1000:
         road_x = 0