jsapi has no permisson，锁屏后音乐播放出错

使用playBackgroundAudio播放音频时，锁屏后，调用getBackgroundAudioPlayerState得到的结果是：

jsapi has no permisson,event=getMusicPlayerState,runningState=background,permissionMsg=permisson ok, detail=jsapi permisson required playing audio but current not playing audio in background state

有问题的机型：OPPO R11 

IOS、OPPO R9、小米5s没有问题。