function exportExcel($list, $filename, $indexKey = array())
{
    require_once(getcwd() . '../../app/Libs/PHPExcel/PHPExcel.class.php');
    require_once(getcwd() . '../../app/Libs/PHPExcel/PHPExcel/IOFactory.php');
    require_once(getcwd() . '../../app/Libs/PHPExcel/PHPExcel/Writer/Abstract.php');
    require_once(getcwd() . '../../app/Libs/PHPExcel/PHPExcel/Writer/Excel2007.php');
    require_once(getcwd() . '../../app/Libs/PHPExcel/PHPExcel/Writer/Excel5.php');
    $header_arr = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');
    //$objPHPExcel = new PHPExcel();                  //初始化PHPExcel(),不使用模板
    $template = base_path() . '/public/template/export_qr_list.xlsx';            //使用模板
    $objPHPExcel = \PHPExcel_IOFactory::load($template);    //加载excel文件,设置模板
    $PHPWriter = new \PHPExcel_Writer_Excel5($objPHPExcel);
    //接下来就是写数据到表格里面去
    $objActSheet = $objPHPExcel->getActiveSheet();
    $j = 2;
    foreach ($list as $value) {
        //这里是设置单元格的内容
        $a = count($value);
        for ($i = 0; $i < $a; $i++) {
            $objActSheet->setCellValue($header_arr[$i] . $j, $value[$i]);
        }
        $j++;
    }
    // 1.保存至本地Excel表格
    //$objWriter->save($filename.'.xls');
    // 2.接下来当然是下载这个表格了，在浏览器输出就好了
    //ob_end_clean();//清除缓冲区,避免乱码
    header("Pragma: public");
    header("Expires: 0");
    header("Cache-Control:must-revalidate, post-check=0, pre-check=0");
    header("Content-Type:application/force-download");
    header("Content-Type:application/vnd.ms-execl");
    header("Content-Type:application/octet-stream");
    header("Content-Type:application/download");;
    header('Content-Disposition:attachment;filename="' . $filename . '.xls"');
    header("Content-Transfer-Encoding:binary");
    $PHPWriter->save('php://output');
}