我正在研究辅助功能。Maven说当Modal弹出时，键盘用户不应该在Modal窗口外交互。我正在使用Bootstrap modal。Bootstrap版本是3。我认为GitHub上有一个关于这个的问题！
下面是Modal的代码片段。

<div class="modal fade in" id="unenrollmentWarningModal" role="dialog" aria-labelledby="myModalLabel" aria-modal="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button class="close" aria-label="Close Dialog" data-dismiss="modal">&times;</button>
                <h2 class="modal-title" id="myModalLabel">Unenrollment Warning!</h2>                    
                <div class="row">
                    <div class="col-md-6" style="text-align: center;">
                        <button class="btn btn-danger btn-block declineUnenrollment enrollButton" data-dismiss="modal">Nevermind!</button>
                    </div>
                    <div class="col-md-6" style="text-align: center;">
                        <button class="btn btn-success btn-block acceptUnenrollment enrollButton">I Understand</button>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

如何解决此问题？