//全选

        function CheckAll() {

            ids.splice(0, 1000000);

            var flag = $("#All_Check").attr("checked");

            $(".orderCheck").each(function () {

                    if (typeof (flag) == 'undefined')

                        flag = false;

                    //$(":input[type=checkbox]").attr("checked", flag);

                    $(this).children().attr("checked", flag);

                    if ($(this).children().attr("checked")) {

                        ids.push($(this).attr("SupplierId"));

                    } else {

                        for (var i in ids) {

                            if ($(this).attr("SupplierId") == ids[i]) {

                                ids.splice(i, 1);

                                break;

                            }

                        }

                    }

                }

            );

            $("#hfids").val(ids);

        }

        //插入订单号

        function InsertOrderCoder(obj) {

            if (obj.attr("checked")) {

                ids.push(obj.parent().attr("SupplierId"));

            }

            else {

                for (var i in ids) {

                    if (obj.parent().attr("SupplierId") == ids[i]) {

                        ids.splice(i, 1);

                        break;

                    }

                }

            }

            $("#hfids").val(ids);

        }

        //点击搜索加载所有勾选的供应商

        function ConfirmSelectedId()

        {

            ids.splice(0, 1000000);

            $(".orderCheck").each(function () {

                if ($(this).children().attr("checked")) {

                    ids.push($(this).attr("SupplierId"));

                }

            }

            );

            $("#hfids").val(ids);

        }

  <td style="text-align:right;">

                 <asp:Button ID="btSearch" Text="搜索" runat="server" style="height: 25px; width: 60px;" OnClick="btSearch_Click" OnClientClick="ConfirmSelectedId();"/>

            </td>

 <th width="4%">

                 <input type="checkbox" id="All_Check" onclick="CheckAll();" />

</th>

 <td align="center">

                         <%--<input type="checkbox" class="orderCheck" value='<%# Eval("SupplierId")%>' name="<%# Eval("ProductBaseId")%>" onclick="InsertOrderCoder($(this));" />--%>

                      <asp:CheckBox runat="server" CssClass="orderCheck"  SupplierId='<%# Eval("SupplierId")%>' onclick="InsertOrderCoder($(this));"/>

                    </td>