function downfiles($field, $value, $fieldinfo) {
        extract($fieldinfo);
        $require = $min_length  ? 'required required_upload' : '';
        $file_type = str_replace('|',',',$file_type);
        $max_size = intval($max_size);
        $fileSingleSizeLimit = isset($max_size)?$max_size*1024*1024:null;
        $string =  '<div class="mb-3 row '.$require.'" data-name="'.$field.'">';
        $string .= '<label class="col-md-2 col-form-label">'.$fieldinfo['name'].'</label>';
        $string .= '<div class="col-md-10">';
        $string .= manks\FileInput::widget(['clientOptions' => ['pick' => ['multiple' => true],'buttonTxt'=>'选择文件','uploadType'=>2,'fileNumLimit'=>$max_num,'fileSingleSizeLimit'=>$fileSingleSizeLimit,'accept' => ['title' => 'Files','extensions' => $file_type,'mimeTypes' => '*']],'name'=>$fieldinfo['field'],'value'=>$value]);
        $string .= '</div>';
        $string .= $fieldinfo['tips']?'<div class="text-muted  input-word-aux offset-l-2">提示：'.$fieldinfo['tips'].'</div>':'';
        $string .= '</div>';
        return $string;
	}