较简单的用ajax修改和添加功能（链接数据库）

<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">×</button>

                        <h4 class="modal-title" id="myModalLabel">修改</h4>

          　　　</div>

          　　  <div class="modal-body" id="content">

                    <!--这里是显示的修改的内容-->

          　　  </div>

          　　　<div class="modal-footer">

               　　<button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>

               　　<button type="button" class="btn btn-primary" id="tijiao">提交</button>

          　　　</div>

          </div><!-- /.modal-content -->

     </div><!-- /.modal -->

</div>