save project

my_music.py

@@ -53,6 +53,14 @@ while True:
 
     if pygame.mixer.music.get_busy() == False:
         pygame.mixer.music.play()
+    if x>120 and x<220 and y>350 and y<400:
+        num-=1
+        if num<0:
+            num=len (music_list)-1
+        pygame.mixer.music.load (music_list[num])
+        pygame.mixer.music.play()
+        click=0
+        play_button=stop_img
 
     # 绘制画面
     screen.blit(bg_img, (0, 0))      # 填充背景