$this->exportAction(), 


 protected function exportMap($row)
{
    $data = $row instanceof \Illuminate\Database\Eloquent\Model ? $row->toArray() : (array) $row;

    return [
        'ID' => data_get($data, 'id'),
        '分类名称' => data_get($data, 'name'),
        '备注' => 'http://www.baidu.com/?code='.data_get($data, 'beizhu'),
        '创建时间' => date('Y-m-d H:i:s', strtotime((string) data_get($data, 'created_at'))),
    ];
}