用jquery获取tbody下的第一个tr的最后一个td里面的值

function(index, layero){
                var re_content = layero.find("#re_content").val();
                var re_process = layero.find("#re_process").val();

                //re_process_old = layero.find("#re_process").val();
                re_process_old = $(".re_process_list tr:first td:last").text();

                if(re_process){
                    if(re_process<re_process_old){
                        $.modal.alertWarning('整改进展不能小于当前值 ！');
                    }
                    if(re_process==null){
                        $.modal.alertWarning('整改进展不能为空 ！');
                    }
                }
                if (re_content) {
                    if(re_content.length > 300){
                        $.modal.alertWarning('进展内容不能超过300字！');
                        return;
                    }
                    var url = ctx + "base/sup/ques/re_process/add";
                    $.post(url, {reContent: re_content, reProgress: re_process,
                                 supFeedbackQuesId: [[${baseSupFeedbackQues.supFeedbackQuesId}]]},
                        function (result) {
                            if (result.code === web_status.SUCCESS) {
                                get_re_process();
                                layer.close(index);
                            } else {
                                $.modal.alertError(result.msg);
                            }
                        }
                    );
                } else {
                    $.modal.alertWarning('进展内容不能为空！');
                }
            }
        });