tring() + ":" + (m<10?"0":"") + m.toString();
  }

  function dragenter(e) {
    e.stopPropagation();
    e.preventDefault();
    dropbox.classList.add('dragging');
  }

  function dragleave(e) {
    e.stopPropagation();
    e.preventDefault();
    dropbox.classList.remove('dragging');
  }

  function dragover(e) {
    e.stopPropagation();
    e.preventDefault();
  }

  function drop(e) {
    e.stopPropagation();
    e.preventDefault();

    const dt = e.dataTransfer;
    const files = dt.files;
    handleF