问getJSON中断页面刷新(F5)。怎么修？

EN

var RealTimeActivity = (function () {
    var realTimeActivity = {};
    var timer = null;
    var active = false;

    realTimeActivity.LastUpdated = new Date();

    function queueUpdate() {
        timer = setTimeout("RealTimeActivity.Update();", 5000);
    }

    function reset() {
        clearTimer();
        queueUpdate();
    }

    function clearTimer() {
        if (timer) {
            clearTimeout(timer);
            timer = null;
        }
    }

    realTimeActivity.Update = function () {
        try {
            clearTimer();
            if (active === true) {
                $.getJSON("realTimeActivity/GetRealTimeData",
                    function (result) {
                        if (result.Success) {
                           // do stuff
                        } else {
                           // Other stuff
                        }

                        queueUpdate();
                    }
                ).fail(function (jqXHR, textStatus, errorThrown) {
                    console.log(textStatus + ": " + errorThrown);
                    reset();
                })
            }
        } catch (ex) {
            reset();
        }
    }

    realTimeActivity.Start = function (i) {
        active = true;
        if (i) {
            realTimeActivity.Update();
        } else {
            queueUpdate();
        }
    }

    realTimeActivity.Stop = function () {
        active = false;
        clearTimer();
    }

    return realTimeActivity;
}());