Laravel8怎么快速导出excel返回值

Laravel8导出excel返回值的简单想法

最近在使用 MaatwebsiteExcel 扩展进行 excel 的导出功能，具体怎么操作，这里不详细说了，通过下面代码导出：

//导出excel【$head是excel表头，$list是数据】
return Excel::download(new CustomerExport($head, $list), date('YmdHis') . '.xls');

我本着好奇打印这个返回值：

print_r(Excel::download(new CustomerExport($head, $list), date('YmdHis') . '.xls'));

结果如下：

SymfonyComponentHttpFoundationBinaryFileResponse Object
(
    [file:protected] => SymfonyComponentHttpFoundationFileFile Object
        (
            [pathName:SplFileInfo:private] => /home/vagrant/www/admin/storage/framework/cache/laravel-excel/laravel-excel-4U89uL9YLn4vNb1QrCDelsmv4Yrk3Ff.xls
            [fileName:SplFileInfo:private] => laravel-excel-4U89uL9YLn4vNb1QrCDelsmv4Yrk3Ff.xls
        )
    [offset:protected] => 0
    [maxlen:protected] => -1
    [deleteFileAfterSend:protected] => 1
    [headers] => SymfonyComponentHttpFoundationResponseHeaderBag Object
        (
            [computedCacheControl:protected] => Array
                (
                    [public] => 1
                )
            [cookies:protected] => Array
                (
                )
            [headerNames:protected] => Array
                (
                    [cache-control] => Cache-Control
                    [date] => Date
                    [last-modified] => Last-Modified
                    [content-disposition] => Content-Disposition
                )
            [headers:protected] => Array
                (
                    [cache-control] => Array
                        (
                            [0] => public
                        )
                    [date] => Array
                        (
                            [0] => Thu, 08 Dec 2022 05:57:26 GMT
                        )
                    [last-modified] => Array
                        (
                            [0] => Thu, 08 Dec 2022 07:16:21 GMT
                        )
                    [content-disposition] => Array
                        (
                            [0] => attachment; filename=20221208152026.xls
                        )
                )
            [cacheControl:protected] => Array
                (
                    [public] => 1
                )
        )
    [content:protected] => 
    [version:protected] => 1.0
    [statusCode:protected] => 200
    [statusText:protected] => OK
    [charset:protected] => 
)

很明显他是个对象。

因为我是前后端分离的，接口也是直接上面代码的，前端同学使用 a 标签跳到接口地址进行下载的，可以成功。但是打开 F12 的 network 查看返回值，前端拿到的是文件流

为什么直接运行接口返回的是个对象，前端拿到居然变为文件流了？

原来是返回的时候，自动给返回头加了两个参数

Content-Disposition:attachment; filename=20221208152026.xls
Content-Type:application/vnd.ms-excel

Content-Disposition 不就是对象里面的头消息嘛。