//初始化声音
SimpleAudioEngine::sharedEngine()->preloadBackgroundMusic( std::string(CCFileUtils::sharedFileUtils()->fullPathForFilename("background.mp3")).c_str() );
SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(0.5);
SimpleAudioEngine::sharedEngine()->playBackgroundMusic(std::string(CCFileUtils::sharedFileUtils()->fullPathForFilename("background.mp3")).c_str(),true);

//控制开关

//打开

SimpleAudioEngine::sharedEngine()->playBackgroundMusic(std::string(CCFileUtils::sharedFileUtils()->fullPathForFilename("background.mp3")).c_str(),true);

//关闭

SimpleAudioEngine::sharedEngine()->stopBackgroundMusic();