请问使用录音功能只获取到音频文件地址，该如何将音频转换为base64格式啊？？？
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- RecorderManager.onError: 小程序/开发/API/媒体/录音/RecorderManager/RecorderManager.onError
- RecorderManager.onFrameRecorded: 小程序/开发/API/媒体/录音/RecorderManager/RecorderManager.onFrameRecorded
- RecorderManager.onInterruptionBegin: 小程序/开发/API/媒体/录音/RecorderManager/RecorderManager.onInterruptionBegin
- RecorderManager.onInterruptionEnd: 小程序/开发/API/媒体/录音/RecorderManager/RecorderManager.onInterruptionEnd
- RecorderManager.resume: 小程序/开发/API/媒体/录音/RecorderManager/RecorderManager.resume
同问