save project

my_game.py

@@ -64,7 +64,7 @@ while True:
     # 将背景图画上去
     # +++++++++++++++++++++++
     bg_x-=1
-    if bg_x=-1000:
+    if bg_x<=-1000:
         bg_x=0
     screen.blit(background,(bg_x,0))
     road_x-=8