为什么小弟我jquery 绑定ID 的click事件无效

foreach (var item in Model)                        {                            if (item.CurrentRootId != Guid.Empty)                            {                        <tr id="node-@item.CatalogId" class="child-of-node-@item.CurrentRootId">                            <td>                                @if (item.CatalogVoucher == "page" || item.CatalogVoucher == "Product")                                {                                    <span class="file">@Html.Encode(item.CatalogName)</span>                                }                                else                                {                                     <span class="folder">@Html.Encode(item.CatalogName)</span>                                }                            </td>                            <td>                                @Html.Encode(item.NavigationLicence)                            </td>                            <td>                                <span id="btn-edit"></span><a href="#" class="btn_edit" categoryid="@item.CatalogId">Edit</a>                                 <span id="btn-delete"></span><a href="#" class="btn_delete" categoryid="@item.CatalogId"> Delete</a>                            </td>                        </tr>                            }                            else                            {                        <tr id="node-@item.CatalogId">                            <td>                                @if (item.CatalogVoucher == "page" || item.CatalogVoucher == "Product")                                {                                    <span class="file">@Html.Encode(item.CatalogName)</span>                                }                                else                                {                                     <span class="folder">@Html.Encode(item.CatalogName)</span>                                }                            </td>                            <td>                                @Html.Encode(item.NavigationLicence)                            </td>                            <td>                                <span id="btn-edit"></span><a href="#"  class="btn_edit" categoryid="@item.CatalogId">Edit</a>                                  <span id="btn-delete"></span><a href="#" class="btn_delete" categoryid="@item.CatalogId">Delete</a>                            </td>                        </tr>                            }                        }

 $(".btn-edit").click(function () {        var id = $(this).attr('categoryId'); //取记录ID        alert('111');        $.ajax({            //target address            url: "Catalogs/GetCategory/" + id,            //post transmission            type: "POST",            //data format:JSON             dataType: 'json',            //beforeSend: function() { },            success: function (result) {                var jsondata = eval('(' + result + ')').category;                if (jsondata != null) {                    $.each(jsondata, function (i, item) {                        $('#edit_id').val(item.CategoryId);                        $('#title2').val(item.title);                        $('#status2').val(item.status);                        $('#kind2').val(item.kind);                    });                    $("#EditPanel").dialog('open');                }                else                    alert("此记录不存在！");            }        });    });