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监听背景音频播放进度更新事件，只有小程序在前台时会回调。
参数
function callback
背景音频播放进度更新事件的回调函数
BackgroundAudioManager.onTimeUpdate
- 指南
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- MediaAudioPlayer
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- BackgroundAudioManager
- BackgroundAudioManager.onCanplay
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- BackgroundAudioManager.onPause
- BackgroundAudioManager.onPlay
- BackgroundAudioManager.onPrev
- BackgroundAudioManager.onSeeked
- BackgroundAudioManager.onSeeking
- BackgroundAudioManager.onStop
- BackgroundAudioManager.onTimeUpdate
- BackgroundAudioManager.onWaiting
- BackgroundAudioManager.pause
- BackgroundAudioManager.play
- BackgroundAudioManager.seek
- BackgroundAudioManager.stop
- 实时音视频
- wx.createLivePusherContext
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- LivePlayerContext
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- LivePusherContext.sendMessage
- LivePusherContext.setBGMVolume
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- LivePusherContext.snapshot
- LivePusherContext.start
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- wx.createOffscreenCanvas
- wx.createCanvasContext
- wx.canvasToTempFilePath
- wx.canvasPutImageData
- wx.canvasGetImageData
- Canvas
- CanvasContext
- CanvasContext.arc
- CanvasContext.arcTo
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- CanvasContext.bezierCurveTo
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- CanvasContext.createCircularGradient
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- FileSystemManager.appendFile
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- FileSystemManager.rename
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- wx.onBLEPeripheralConnectionStateChanged
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- wx.makeBluetoothPair
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- wx.createBLEConnection
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- wx.writeBLECharacteristicValue
- 日历
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- wx.stopBluetoothDevicesDiscovery
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- wx.openBluetoothAdapter
- wx.onBluetoothDeviceFound
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- wx.getConnectedBluetoothDevices
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- wx.closeBluetoothAdapter
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