Change state a select to disabled

I have this design

When I give the button assign it saves me the information in a table of sql and I need the select to be disabled and although I update the page always remain disabled .

this is the jade

table(id='example-table' class='table table-fixed analisisD')
        thead
          tr
            th='Articulo'
            th='Descripción'
            th='Um'
            th='Ov'
            th='#Ubic'
            th='Teorico'
            th(class='vi1')='Conteo1'
            th(class='vi2')='Conteo2'
            th(class='vi3')='Conteo3'
            th='Dif'
            th='Dif $'
            th(class='vi2')='Asignar conteo'
            th='Seleccionar'
              input(type="checkbox" id='selectall')

          tbody(class='unico')
          if ListArticulos != undefined
            each Articulos in ListArticulos
              tr(class='Art')
                td(id='id_articulo' class='iarticulo')= Articulos.SI_Articulo
                td= Articulos.SI_Descripcion
                td= Articulos.SI_UM
                td= Articulos.SI_OV
                td
                  button(type='button' id='btn-analisisInterno' class='btn btn-danger' data-toggle='modal' data-target='#myModal')= Articulos.SI_Ubicacion
                td= Articulos.SI_Existencia
                td(class='vi1')= Articulos.SI_Cantidad
                td(class='vi2')= Articulos.SI_Cantidad2
                td(class='vi3')
                td= Articulos.SI_Dif
                td= Articulos.SI_Dif_Dinero
                td(class='vi2 sel')
                  select(id='widthSelect' class='form-control widthSelect' name='mood')
                    option(name="0" value="0") -- Seleccione usuario --
                    option(name="1" value="1") 1020433143
                    option(name="2" value="2") 1026138136
                    option(name="3" value="3") 1037618420
                    option(name="4" value="4") 1128430921
                    option(name="5" value="5") 1152683886
                    option(name="6" value="6") 15255651
                    option(name="7" value="7") 43222012
                    option(name="8" value="8") 71268442
                    option(name="9" value="9") 71703960
                    option(name="10" value="10") 8463111
                    option(name="11" value="11") 98514535
                    option(name="12" value="12") 98643619
                    option(name="13" value="13") Admin
                td
                  input(type="checkbox" id='hola' class='case' name='case')

and in this way I save by clicking on the button asignar

$(function() {
    $('.asignarConteo').on('click', function(e) {
        $('.widthSelect :selected[value!="0"]').closest("tr").each(function() {
            //console.log(
            //    $(this).find(".iarticulo").text(),
            //    $(this).find(":selected").text());
            var ar = $(this).find(".iarticulo").text();
            var usu = $(this).find(":selected").text();
            //alert(ar + usu);
            $.ajax({
                url: 'http://localhost:3000/AsigUsuarios',
                method: 'post',
                data: { idArticulo: ar, Usuario: usu },
                success: function(res) {
                    console.log(res);
                }
            });
        })
    });

});