부트스트랩 모달 상자가 가로 및 세로 중앙에 배치되고 드래그 기능이 추가되었습니다.

$("#myModal").draggable({
handle: ".modal-header",
cursor: 'move',
refreshPositions: false
});

/* center modal */
function centerModals() {
$('#myModal').each(function(i) {
var $clone = $(this).clone().css('display', 'block').appendTo('body'); var top = Math.round(($clone.height() - $clone.find('.modal-content').height()) / 2);
top = top > 0 ? top : 0;
$clone.remove();
$(this).find('.modal-content').css("margin-top", top);
});
}
$('#myModal').on('show.bs.modal', centerModals);
$(window).on('resize', centerModals);

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title" id="myModalLabel">标题</h4>
</div>
<div style="padding:5px;">
<div class="modal-body" data-scrollbar="true" data-height="200" data-scrollcolor="#000">

</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
</div>
</div>
</div>
</div>