bootstrap模态框里面的button按钮怎么隐藏

Question

<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">用户删除操作</h4>
            </div>
            <div class="modal-body" id="modal_userId">在这里添加一些文本</div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
                <button type="button" id="modal_user" class="btn btn-primary">提交更改</button>
            </div>
        </div><!-- /.modal-content -->
    </div><!-- /.modal -->
</div>

id="modal_user"这个button

如何在调出模态框的时候隐藏他

Answer 1

先加上hidden这个class，像这样

<button type="button" id="modal_user" class="btn btn-primary hidden">提交更改</button>

Answer 2

<button type="button" id="modal_user" **hidden** class="btn btn-primary">提交更改</button>

加上这个hidden属性就行了,显示的时候在去掉这个属性