PHPExcel样式获取默认数字格式

I have the following code

$xl = new PHPExcel();
$sheet = xl->setActiveSheetIndex(0)
$sheet->getStyle('A')->getNumberFormat()->setFormatCode('#,##0.00');
$format = $sheet->getStyle('A')->getNumberFormat()->getFormatCode();

I'd expect $format to contain #,##0.00 but it contains General.

Am I missing something?

PHPExcel v. 1.7.6

PHPExcel does not support row or column styles: styles are applied to cells

$sheet->getStyle('A1')->getNumberFormat()->setFormatCode('#,##0.00');

or to ranges of cells

$sheet->getStyle('A1:B2')->getNumberFormat()->setFormatCode('#,##0.00');

and version 1.7.6 is very dated now, you really should upgrade to a more recent version