wx.downloadFile({
  url: 'https://example.com/audio/123', // Example URL, not a real resource
  success (res) {
    // As long as the server responds, the response content will be written to the file and the success callback will be triggered. You need to determine if the desired content was downloaded
    if (res.statusCode === 200) {
      console.log('filePath', res.tempFilePath);
    }
  }
})

const listener = function (res) { console.log(res) }

DownloadTask.onHeadersReceived(listener)
DownloadTask.offHeadersReceived(listener) // Must pass the same function object used in onHeadersReceived

const listener = function (res) { console.log(res) }

DownloadTask.onHeadersReceived(listener)
DownloadTask.offHeadersReceived(listener) // Must pass the same function object used in onHeadersReceived

const downloadTask = wx.downloadFile({
  url: 'http://example.com/audio/123', // Example URL, not a real resource
  success (res) {
    wx.playVoice({
      filePath: res.tempFilePath
    })
  }
})

downloadTask.onProgressUpdate((res) => {
  console.log ('Download progress', res.progress)
  console.log (' Length of the downloaded data', res.totalBytesWritten)
  console.log ('Expected total length of the data to be downloaded', res.totalBytesExpectedToWrite)
})

DownloadTask.abort () // Cancel the download task