ทำไมถึงเรียกใช้ฟังชั่น ซ้ำเเละเพิ่มขึ้นเรื่อยๆ ผมต้องทำอย่างไรเพื่อให้ทำงานเพียงครั้งเดียว เเล้ว ออกจากฟังชั่นเลย

<script>
    var Numr = 1;
    var input = document.getElementById("lt_NameShow");
    input.addEventListener("keyup", function(event) {
        event.preventDefault();
        if (event.keyCode === 13) {
            document.getElementById("lotoType").value = $("#lt_NameShow").val();
            $.ajax({
                url: "../Class/class.php",
                global: false,
                type: "POST",
                data: ({
                    id: $("#lt_NameShow").val(),
                    Mode: "chType"
                }),
                dataType: "JSON",
                async: false,
                success: function(jd) {
                    $.each(jd, function(key, val) {

                        var div1 = '<input type="text" name="summaryT2" id="lotoNumber" class="form-control SNumber" placeholder="เลข" maxlength="3" required>';
                        document.getElementById("lotoBoth").disabled = false;
                        $('#div1').empty();
                        $('#div1').append(div1);
                        document.getElementById("lt_NameShow").value = val["lt_Name"];
                        document.getElementById("lotoNumber").focus();

                        var input2 = document.getElementById("lotoNumber");
                        input2.addEventListener("keyup", function(event) {
                            event.preventDefault();
                            if (event.keyCode === 13) {
                                if ($("#lotoNumber").val().length != 3) {
                                    document.getElementById("lotoNumber").focus();
                                } else {
                                    document.getElementById("lotoYes").focus();
                                }
                            }
                        });
                        var input3 = document.getElementById("lotoYes");
                        input3.addEventListener("keyup", function(event) {
                            event.preventDefault();
                            if (event.keyCode === 13) {
                                addDiv2();
                            }
                        });
                    });
                }
            });
        }

    });

    function addDiv2() {
        $('#diva').empty();
        var lotoType = $("#lotoType").val();
        var lotoNumber = $("#lotoNumber").val();
        var lotoYes = $("#lotoYes").val();
        var lotoBoth = $("#lotoBoth").val();

        $.ajax({
            url: "../Class/sql-insert.php",
            global: false,
            type: "POST",
            data: ({
                Mode: "byLoto",
                Type: lotoType,
                Number: lotoNumber,
                Price: lotoYes,
                lotoBoth: lotoBoth
            }),
            dataType: "JSON",
            async: false,
            success: function(jd) {
                $.each(jd, function(key, val) {
                    var diva = '<tr id="N' + val["sd_id"] + '" >';
                    diva += '<td><button class="btn btn-' + val["sty"] + ' btn-mini"><i class="fa fa-star"></i></button></td>';
                    diva += '<td>' + val["lt_Name"] + '</td>';
                    diva += '<td>' + val["sd_Number"] + '</td>';
                    diva += '<td>' + val["sd_Price"] + '<input type="hidden" name="sd_Price[]" value="' + val["sd_Price"] + '"></td>';
                    diva += '<td><a href="#" class="btn btn-pinterest" onclick="delss(' + val["sd_id"] + ')">ลบ</a></td>'
                    diva += '</tr>';

                    $('#diva').append(diva);

                });
            }

        });

    }
</script>