save project

my_game.py

@@ -65,9 +65,9 @@ while True:
         if index >= 5:
             index = 0
     # 将背景图画上去
-    shan_x -=2
-    if shan_x <-1000:
-        shan_x=0
+    bg_x -=2
+    if bg_x <-1000:
+        bg_x=0
     screen.blit(background, (bg_x, 0))     # 远处背景
     road_x -=8
     if road_x <-1000: