PHPExcel php execl 下载 或 保存到本地

public static function saveExcel($objPHPExcel, $excelName,  $output) {
  $objWriter = PHPExcel_IOFactory::createWriter ( $objPHPExcel, "Excel5" );
  if (! strpos ( $_SERVER ["HTTP_USER_AGENT"], "Firefox" ))
   $excelName = urlencode ( $excelName );
  if ($output) {
   ob_end_clean ();
   header ( "Content-Type: application/force-download" );
   header ( "Content-Type: application/octet-stream" );
      header ( "Content-Type: application/download" );
   header ( "Content-Disposition: attachment; filename=" . $excelName . ".xls" );
   header ( "Content-Transfer-Encoding: binary" );
   header ( "Expires: Mon, 26 Jul 1997 05:00:00 GMT" );
   header ( "Last-Modified: " . gmdate ( "D, d M Y H:i:s" ) . " GMT" );
   header ( "Cache-Control: must-revalidate, post-check=0, pre-check=0" );
   header ( "Pragma: no-cache" );
   $objWriter->save ( "php://output" );
  } else {
   $objWriter->save ( "Excel/" . $excelName . ".xls" );
   echo "<script language="javascript" type="text/javascript">window.top.window.stopUpload(1);</script>";
  }
 }