var $item = $('.del-btn').click(function(e){
var target = $(this).closest('tr');
if(confirm ("첨부파일을 삭제하시겠습니까?")){
var seq = $item.index(this);
var dataTransfer = new DataTransfer();
var files = $('#files')[0].files;
var fileArray = Array.from(files);
fileArray.splice(seq, 1);
fileArray.forEach(file => { dataTransfer.items.add(file); });
$('#files')[0].files = dataTransfer.files;
target.remove();
}
});