$result = $this->model->query($sql)->rows;
    # 下载产品Excel
    $search = "";
    foreach ($result as $key => $val) {
        $search .= "<tr>
   <td>{$val['product_id']}</td>
   <td>{$val['sku']}</td>
   <td>{$val['keyword']}</td>
   <td>{$val['language_id']}</td>
</tr>";
    }

    $table = "<meta http-equiv='Content-Type' content='text/html; charset=UTF-8' />
   <table border='1' width='100%'>
      <tr>
         <td>产品ID</td>
         <td>SKU</td>
         <td>SEO-URL</td>
         <td>语言ID</td>
      </tr>".$search."
   </table>";

    $file_name = 'SEO URL 映射表'.date("Y-m-d H:i:s");
    header("Pragma: public");
    header("Content-type:application/vnd.ms-excel");
    header("Content-Disposition: inline;filename=$file_name.xls");

    echo $table;
    exit;