function uploadAvatar(Request $request)
  {
    $user_id = Auth::id();
    $avatar = $request->file('avatar')->store('/public/' . date('Y-m-d') . '/avatars');
    //上传的头像字段avatar是文件类型
    $avatar = Storage::url($avatar);//就是很简单的一个步骤
    $resource = Resource::create(['type' => 1, 'resource' => $avatar, 'user_id' => $user_id]);
    if ($resource) {
      return $this->responseForJson(ERR_OK, 'upload success');
    }
  return $this->responseForJson(ERR_EDIT, 'upload fails');
  }

function upload_img($file)
{
  $url_path = 'uploads/cover';
  $rule = ['jpg', 'png', 'gif'];
  if ($file->isValid()) {
    $clientName = $file->getClientOriginalName();
    $tmpName = $file->getFileName();
    $realPath = $file->getRealPath();
    $entension = $file->getClientOriginalExtension();
    if (!in_array($entension, $rule)) {
      return '图片格式为jpg,png,gif';
    }
    $newName = md5(date("Y-m-d H:i:s") . $clientName) . "." . $entension;
    $path = $file->move($url_path, $newName);
    $namePath = $url_path . '/' . $newName;
    return $path;
  }
}