https://developers.weixin.qq.com/miniprogram/dev/api/media/audio/BufferSourceNode.html

报错信息：

Error playing chunk: TypeError: Cannot set property playbackRate of [object AudioBufferSourceNode] which has only a getter

文档上写着 playbackRate 属性可读可写，但是写入时却报错了，提示该属性是只读的。