https://developers.weixin.qq.com/miniprogram/dev/api/media/background-audio/BackgroundAudioManager.html

  onlinePlay:function(){
    audio.title = 'title';
    audio.referrerPolicy = 'origin';
    audio.src='https://xxx.xxx.com/attached/shop0/image/20240406/yoo1ye9hagnryujc01hu.mp3?v=7';
    audio.play();
  }

真机没有refer：

模拟器是正常的：