bootstrap 3.3.5 modal模态框垂直居中已解决

 
<button class="btn btn-primary" data-toggle="modal" data-target="#myModal">
测试
</button>

 <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">&times;</button>
                    <h4 class="modal-title" id="myModalLabel">Modal title</h4>
                </div>
                <div class="modal-body">
                    <input id="productimg" name="productimg[]" type="file" multiple=true class="file-loading">
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                    <button type="button" class="btn btn-primary">Save changes</button>
                </div>
            </div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
</div>
<script>
$(function () {
$("[data-toggle='modal']").click(function () {
var _target = $(this).attr('data-target')
t = setTimeout(function () {
var _modal = $(_target).find(".modal-dialog")
_modal.animate({'margin-top': parseInt(($(window).height() - _modal.height()) / 2)}, 300)
            }, 200)
        })


    })

</script>

加上这个就OK了