thinkphp phpexcel导出返回乱码

今天做了一个excel文件导出的功能  可是无论怎么改网上怎么搜答案什么缓冲啊charset=UTF-8'a都不起效

<?php
namespace app\admin\controller;
use cmf\controller\AdminBaseController;
use think\Db;
use think\Loader;
class DownController extends AdminBaseController
{

/**
* 将数据库数据导出为excel文件
*/
function downLoadExcle($list)
{
// $user = Db::query("select * from user");
Loader::import('PHPExcel.PHPExcel');
Loader::import('PHPExcel.PHPExcel.IOFactory.PHPExcel_IOFactory');
Loader::import('PHPExcel.PHPExcel.Reader.Excel2007');
$objPHPExcel = new \PHPExcel();
$arr = json_decode(input('arr'));
//设置每列的标题
$objPHPExcel->setActiveSheetIndex(0)
->setCellValue('A1', '序号')
->setCellValue('B1', '型号')
->setCellValue('C1', '外箱')
->setCellValue('D1', '中盒')
->setCellValue('E1', 'sn')
->setCellValue('F1', '追溯码')
->setCellValue('G1', '口味')
->setCellValue('H1', '套装')
->setCellValue('I1', '对应出库单号')
->setCellValue('J1', '出库时间')
->setCellValue('K1', '备注');
//存取数据 这边是关键
foreach ($list as $k => $v) {
$num = $k + 2;
$objPHPExcel->setActiveSheetIndex(0)
->setCellValue('A' . $num, $v['id'])
->setCellValue('B' . $num, $v['name'])
->setCellValue('C' . $num, $v['p_bar_code'])
->setCellValue('D' . $num, $v['z_bar_code'])
->setCellValue('E' . $num, $v['u_bar_code'])
->setCellValue('F' . $num, $v['back'])
->setCellValue('G' . $num, $v['flavor'])
->setCellValue('H' . $num, $v['suit'])
->setCellValue('I' . $num, $v['order_code'])
->setCellValue('J' . $num, $v['create_time'])
->setCellValue('K' . $num, $v['content']);
}
ob_end_clean();
$title = '我的文档';
$objPHPExcel->getActiveSheet()->setTitle($title);
$objPHPExcel->setActiveSheetIndex(0);
$objPHPExcel->getActiveSheet()->getColumnDimension('B')->setAutoSize(true);
$objPHPExcel->getActiveSheet()->getColumnDimension('C')->setAutoSize(true);
$timestamp = time();
header("Pragma: public");
header("Expires: 0");
header("Cache-Control:must-revalidate, post-check=0, pre-check=0");
header("Content-Type:application/force-download");
header("Content-Type:application/vnd.ms-execl");
header("Content-Type:application/octet-stream");
header("Content-Type:application/download");
header('Content-Disposition: attachment;filename="links_out'.$timestamp.'.xls"');
header("Content-Transfer-Encoding:binary");
// header('Content-Type: application/vnd.ms-excel;charset=UTF-8');
// header('Content-Disposition: attachment;filename="订单汇总表(' . date('Ymd-His') . ').xlsx"');
// header('Cache-Control: max-age=0');
Loader::import('PHPExcel.PHPExcel.Reader.Excel5');
$objWriter = \PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save('php://output');
exit;
}

/**
* @param $filepathname
* 将excel文件导入数据库
* 使用iconv转换字符集防止文件名为中文时乱码
*/
function uploadExcel($filepathname)
{
$file_path =$filepathname;
$file_path = iconv('utf-8', 'gbk', $file_path);
Loader::import('PHPExcel.PHPExcel.Reader.Excel2007');
Loader::import('PHPExcel.PHPExcel.Reader.Excel5');
$PHPReader = new \PHPExcel_Reader_Excel2007();
if (!$PHPReader->canRead($file_path)) {
$PHPReader = new \PHPExcel_Reader_Excel5();
if (!$PHPReader->canRead($file_path)) {
return;
}
}
$objPHPExcel = $PHPReader->load($file_path, $encode = 'utf-8');
$sheet = $objPHPExcel->getSheet(0);
$highestRow = $sheet->getHighestRow();//获取总行数
for ($i = 2; $i <= $highestRow; $i++) {
$data['name'] = $objPHPExcel->getActiveSheet()->getCell("B" . $i)->getValue();
$data['p_bar_code'] = $objPHPExcel->getActiveSheet()->getCell("C" . $i)->getValue();
$data['z_bar_code'] = $objPHPExcel->getActiveSheet()->getCell("D" . $i)->getValue();
$data['u_bar_code'] = $objPHPExcel->getActiveSheet()->getCell("E" . $i)->getValue();
$data['back'] = $objPHPExcel->getActiveSheet()->getCell("F" . $i)->getValue();
$data['flavor'] = $objPHPExcel->getActiveSheet()->getCell("G" . $i)->getValue();
$data['suit'] = $objPHPExcel->getActiveSheet()->getCell("H" . $i)->getValue();
$data['order_code'] = $objPHPExcel->getActiveSheet()->getCell("I" . $i)->getValue();
$data['create_time'] = $objPHPExcel->getActiveSheet()->getCell("J" . $i)->getValue();
$data['content'] = $objPHPExcel->getActiveSheet()->getCell("K" . $i)->getValue();
$allData[] = $data;
if($data['name']==''){
break;
}
}
return $allData;

}

/**
* 文件上传
*/
function uploadFile($file)
{
// 获取表单上传文件 例如上传了001.jpg
// $file = request()->file('avatar');
// 移动到框架应用根目录/public/uploads/ 目录下
$info = $file->validate(['ext'=>'xlsx,xls,cvs'])->move(ROOT_PATH . 'public' . DS . 'uploads');
if ($info) {
// echo $info->getPathname(); 获取文件路径
//将文件写入数据库
$send = $this->uploadExcel($info->getPathname());
return $send;
} else {
// 上传失败获取错误信息
echo $file->getError();
}

}
}

当代码没有错误的时候一定要看一下请求  如果你的请求是ajax  那么你的请求是要有返回值的 所以才会出现乱码

将请求换成普通请求  就会正常下载文件了  绝对有效 摸着我自己的良心说