模态框和下拉菜单组合使用出现问题(待解决)_ClerverCC的博客

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary btn-sm" data-toggle="modal" data-target="#myModal" data-whatever="@CleverCC" >
    Launch demo modal
</button>
<!-- Modal -->
<div class="modal fade bs-example-modal-sm" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-sm">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
                <h4 class="modal-title" id="myModalLabel">Modal title</h4>
            </div>
            <div class="modal-body">
               <div class="form-group ">
                   <label class="control-label ">username</label>
                   <input class="form-control" type="text">
               </div>
                <div class="form-group has-success ">
                    <label class="control-label">password</label>
                    <input class="form-control" type="password">
                </div>
            </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>
    </div>
</div>
<!-- Button trigger modal -->
<button type="but