dd($request->all())通过ajax laravel上传文件时数组为空

var formData = new FormData();
formData.append('file', file); // file为文件对象
$.ajax({
    url: 'upload',
    type: 'POST',
    data: formData,
    processData: false,
    contentType: false,
    success: function(response) {
        // 处理上传成功后的逻辑
    },
    error: function(xhr, status, error) {
        // 处理上传失败后的逻辑
    }
});

Route::post('upload', 'UploadController@upload');

public function upload(Request $request)
{
    $file = $request->file('file');
    if ($file) {
        // 处理文件上传逻辑
    } else {
        // 文件上传失败
    }
}

'default' => 'public',
...
'disks' => [
    'public' => [
        'driver' => 'local',
        'root' => public_path('uploads'),
        'url' => env('APP_URL').'/uploads',
        'visibility' => 'public',
    ],
    ...
],