// The advanced download API supports checkpoint restart. Therefore, a HEAD request will be sent before the download to obtain the file information.
    // If you are using a temporary key or accessing with a sub-account, ensure that your permission list includes HeadObject.

    // `CosTransferManger` supports checkpoint restart for download. You only need to ensure the consistency of parameters `bucket`, `cosPath`, and `savePath`.
    // Then the SDK will resume the download from where interrupted.

    // Get `CosTransferManger`
    let cosTransferManger: CosTransferManger = Cos.getDefaultTransferManger();
    //let cosTransferManger: CosTransferManger = Cos.getTransferManger(newRegion);
    // Bucket name in the format of `BucketName-APPID` (`APPID` is required), which can be viewed in the COS console at https://console.tencentcloud.com/cos5/bucket.
    let bucket = "examplebucket-1250000000";
    let cosPath = "exampleobject"; //Location identifier of the object in the bucket, i.e., the object key
    let downliadPath = "Path of the local file"; // Path of the local file

    // Callback for successful download
    let successCallBack = (header?: object) => {
      // TODO: Logic after successful download
    };
    // Callback for failed download
    let failCallBack = (clientError?: CosXmlClientError, serviceError?: CosXmlServiceError) => {
      // TODO: Logic after failed download
      if (clientError) {
        console.log(clientError);
      }
      if (serviceError) {
        console.log(serviceError);
      }
    };
    // Callback for the download status, through which you can check the task process
    let stateCallBack = (state: TransferState) => {
      // todo notify transfer state
    };
    // Callback for the download progress
    let progressCallBack = (complete: number, target: number) => {
      // todo Do something to download progress...
    };

    // Start the download
    let transferTask:TransferTask = await cosTransferManger.download(
      bucket,
      cosPath,
      downliadPath,
      {
        resultListener: {
          successCallBack: successCallBack,
          failCallBack: failCallBack
        },
        stateCallback: stateCallBack,
        progressCallback: progressCallBack
      }
    );
    // Pause the task
    transferTask.pause();
    // Resume the task
    transferTask.resume();
    // Cancel the task
    transferTask.cancel();