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++;
 }