<asp:RadioButtonList ID="rlPlan" runat="server" RepeatDirection="Horizontal" Width="200px">

                <asp:ListItem Value="计划内">计划内</asp:ListItem>

                <asp:ListItem Value="计划外">计划外</asp:ListItem>

                <asp:ListItem Value="" Selected>不选</asp:ListItem>

                </asp:RadioButtonList>

var checkedVal = $j("input[name='rlPlan']:checked").val();