小程序运维中心一直报错setBackgroundAudioState:fail: jsapi has no permission, event=setBackgroundAudioState, runningState=background, permissionMsg=permission ok, detail=jsapi permission required playing audio but current not playing audio in background state;at App get function;at api setBackgroundAudioState fail callback function Error: setBackgroundAudioState:fail: jsapi has no permission, event=setBackgroundAudioState, runningState=background, permissionMsg=permission ok, detail=jsapi permission required playing audio but current not playing audio in background state at Function.fail (WASubContext.js:1:728454) at WASubContext.js:1:389347 at v (WASubContext.js:1:389516) at WASubContext.js:1:390380) 你们的反馈是不能在后台调用runningState=background，请问是什么问题，有清晰的文档说明吗