Phpexcel 多sheet ，设置

多sheet 一定要县创建sheet 

 foreach ($alias_name as $ca) {
            if ($sheet > 0) {
                $objExcel->createSheet();  // 创建sheet
            }
            $objExcel->setActiveSheetIndex($sheet);
            $objExcel->getActiveSheet()->setTitle($result['alias_name'][$ca]);
            $objActSheet = $objExcel->getActiveSheet();
            $objActSheet->getDefaultRowDimension()->setRowHeight(30);
            $sheet++;
}