Method playLyricAtIndex

js/ReadingSystem.js:454–465

* 从指定时间播放 * @param {number} index - 歌词索引 * @param {number} time - 播放时间

(index, time)

   * @param {number} time - 播放时间
   */
  playLyricAtIndex(index, time) {
    if (!this.dom.audioPlayer) return;
    
    // 验证时间值是否为有效的有限数值
    if (!Number.isFinite(time)) {
      console.warn('Invalid time value for playback:', time);
      return;
    }
    
    this.dom.audioPlayer.currentTime = time;
    this.dom.audioPlayer.play();
  }

  /**
   * 保存播放进度