javascript - 将行添加到带有 Jquery 错误的表 [object HTMLSpanElement]

Question

我正在尝试将模态的值添加到表中，但是当我单击注册时，出现错误将行添加到带有 Jquery 错误 [object HTMLSpanElement] 的表。

$(document).ready(function(){
    $(".add").click(function(){
        //var name = $("#nomeoferta").val();
        var name = document.getElementById('nomeoferta');
        var lastname = $("#descontooferta").val();
        var lastname = $("#ativodesde").val();
        var markup = "<tr><td></td><td>" + nomeoferta + "</td><td>" + descontooferta + "</td><td></td><td>" + ativodesde + "</td></tr>";
        $("#dataTable").append(markup);
    });
});

HTML：

      <!-- Modal -->
        <div class="modal fade" id="exampleModal" tabindex="-1" role="dialog"
            aria-labelledby="exampleModalLabel" aria-hidden="true">
            <div class="modal-dialog" role="document">
                <div class="modal-content">
                    <div class="modal-header">
                        <h5 class="modal-title" id="exampleModalLabel">Cadastro de Novas Ofertas</h5>

                        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                            <span aria-hidden="true">&times;</span>
                        </button>
                    </div>
                    <div class="input-group mb-3">
                        <span class="input-group-text" id="nomeoferta">Nome da Oferta</span>
                        <input type="text" class="form-control" placeholder="Nome da Oferta"
                            aria-label="Username" aria-describedby="basic-addon1">
                    </div>
                    <div class="input-group mb-3">
                        <span class="input-group-text" id="descontooferta">Desconto de: </span>
                        <input type="text" class="form-control col-md-4" placeholder="Desconto"
                            aria-label="Desconto" aria-describedby="basic-addon1" type="number">
                        <span class="input-group-text" id="basic-addon2">%</span>
                    </div>

                    <div class="input-group mb-3">
                        <span class="input-group-text" id="ativodesde">Ativo desde</span>
                        <input type="date" class="form-control col-md-4" placeholder="Desconto"
                            aria-label="Desconto" aria-describedby="basic-addon1" type="number">

                    </div>


                    <div class="modal-footer">
                        <button type="button" class="btn btn-secondary" data-dismiss="modal">Fechar</button>
                        <button type="button" class="btn btn-primary add">Cadastrar</button>
                    </div>
                </div>
            </div>
        </div>
        <!-- Modal -->

标签： javascriptjquerybootstrap-4