关键:
//配置
$objPHPExcel->getActiveSheet()->setTitle('');
// Set active sheet index to the first sheet, so Excel opens this as the first sheet
$objPHPExcel->setActiveSheetIndex(0);//导出第一个结束
//导出第二个开始
$objPHPExcel->createSheet();
$objPHPExcel->setActiveSheetIndex(1);
//配置