import pygame

 import sys

 from pygame.locals import *

 pygame.init()

 pygame.mixer.init()  # 初始化混音器模块

 # 音效可以同时播放多个，而music只能同时播放一个

 pygame.mixer.music.load('BG.ogg')   # 背景音乐通常用.ogg格式

 pygame.mixer.music.set_volume(0.2)  # 设置音量

 pygame.mixer.music.play()  # 播放音乐

 sound1 = pygame.mixer.Sound('M1.wav')  # 音效通常用.wav格式

 sound1.set_volume(0.2)

 sound2 = pygame.mixer.Sound('M2.wav')

 sound2.set_volume(0.2)

 bg_size = width, height = 300, 200

 screen = pygame.display.set_mode(bg_size)

 pygame.display.set_caption('Music')

 pause = False

 pause_img = pygame.image.load('pause.png').convert_alpha()

 unpause_img = pygame.image.load('unpause.png').convert_alpha()

 pause_rect = pause_img.get_rect()

 pause_rect.left, pause_rect.top = (width - pause_rect.width) // 2, (height - pause_rect.height) // 2

 clock = pygame.time.Clock()

 while True:

     for event in pygame.event.get():

         if event.type == QUIT:

             sys.exit()

         if event.type == MOUSEBUTTONDOWN:

             if event.button == 1:  # 左键

                 sound1.play()

             if event.button == 3:  # 右键

                 sound2.play()

         if event.type == KEYDOWN:

             if event.key == K_SPACE:  # 空格

                 pause = not pause

     screen.fill((255, 255, 255))  # 填充背景

     if pause:

         screen.blit(pause_img, pause_rect)

         pygame.mixer.music.pause()  # 暂停播放

     else:

         screen.blit(unpause_img, pause_rect)

         pygame.mixer.music.unpause()  # 恢复播放

     pygame.display.flip()

     clock.tick(30)  # 帧率为30