问如何在Laravel中检索FormData

EN

 public uploadToServer() {
    let blob  = this.recordRTC instanceof Blob ? this.recordRTC : this.recordRTC.blob;
    let fileType = blob.type.split('/')[0] || 'audio';
    let fileName = (Math.random() * 1000).toString().replace('.', '');
    if (fileType === 'audio') {
      fileName += '.' + (!!navigator.mozGetUserMedia ? 'ogg' : 'wav');
    } else {
      fileName += '.webm';
    }
    // create FormData
    var formData: FormData = new FormData();
    console.log(fileName);
    console.log(blob);
    console.log(fileType);
    formData.append(fileType + '-filename', fileName);
    formData.append(fileType + '-blob', blob);
    console.log(formData);
    this.recordingService.saveRecording(formData).subscribe(
      data => this.saveRecordingSuccess(data),
      error => this.saveRecordingFail(error)
    );
  }

 public function saveRecording(Request $request)
  {
    $fileName = '';
    $tempName = '';
    $file_idx = '';

    if (!empty($_FILES['audio-blob'])) {
        $file_idx = 'audio-blob';
        $fileName = $_POST['audio-filename'];
        $tempName = $_FILES[$file_idx]['tmp_name'];
    }
    if (empty($fileName) || empty($tempName)) {
        if(empty($tempName)) {
            echo 'Invalid temp_name: '.$tempName;
            return;
        }
        echo 'Invalid file name: '.$fileName;
        return;
    }
    $filePath = public_path('voiceRecording/' . $fileName);

    // make sure that one can upload only allowed audio/video files
    $allowed = array(
        'webm',
        'wav'
    );
    $extension = pathinfo($filePath, PATHINFO_EXTENSION);
    if (!$extension || empty($extension) || !in_array($extension, $allowed)) {
        echo 'Invalid file extension: '.$extension;
        return;
    }
    if (!move_uploaded_file($tempName, $filePath)) {
      // error code
        return;
    }
}