// 音频处理类
function Sound() {
  this.lib = library;

  this.music = {};
}

Sound.of = function () {
  const instance = new Sound();
  instance.init();
  return instance;
};

Sound.prototype.init = function () {
  createjs.Sound.alternateExtensions = ['mp3'];
  const sounds = [
    { src: 'sounds/bgmMusic.mp3', id: 'bgm' },
    { src: 'sounds/excitationMusic.mp3', id: 'excitation' },
    { src: 'sounds/amazing.mp3', id: 'amazing' },
    { src: 'sounds/unbelievable.mp3', id: 'unbelievable' },
  ];
  createjs.Sound.addEventListener('fileload', function (event) {
    console.log('event: ', event);
    this.music[event.id] = createjs.Sound.createInstance(event.id);
  });
  createjs.Sound.registerSounds(sounds, '../../');
};

Sound.prototype.playBgm = function () {
  this.music.bgm && this.music.bgm.play({ loop: -1, volume: 0.3 }); // 播放背景音乐
};