save project

my_music.py

@@ -54,6 +54,14 @@ while True:
                     else:
                         pygame.mixer.music.unpause()  
                         b= stop_img
+                if x > 120 and x < 220 and y > 350  and y < 400:
+                        num -=1
+                        if num <0 :
+                            num=len(c)-1
+                        pygame.mixer.music.load(d + "//" + c[num])  
+                        pygame.mixer.music.play()
+                        tick = 0
+                        play_button = stop_img
 
     if pygame.mixer.music.get_busy() == False:
         num +=1
@@ -62,6 +70,7 @@ while True:
         pygame.mixer.music.load(d + "//" + c[num])  
         pygame.mixer.music.play()  
 
+    
     # 绘制画面
     screen.blit(bg_img, (0, 0))      # 填充背景
     screen.blit(b, (270, 330))   # 暂停按钮