绑定键盘事件

<div class="modal-footer">
     <button type="button" class="btn btn-default" data-dismiss="modal">取消</button>
     <button type="button" class="btn btn-primary" data-dismiss="modal" id="hold">保存</button>
</div>

//添加键盘事件
        document.onkeyup = function (event){
        var e = event || window.event;
        var keyword = e.keyCode || e.which;
        switch(keyword){
            case 13:
            document.getElementById("hold").click();
            
        }
    }