js计时器 + asp 计时器

JS：

<script type="text/javascript">

        var counts = ;
        function starts() {
            if (counts == ) {
                alert('已经开启了实时监控！')
                return false;

            }
            if (confirm("确定开启实时监控?")) {
                setInterval("GetJSMapGps()", ); //15秒
                counts = ;
                return true;

            }
            else return false;

        }
        function dw() {

            appletFrame.s_locationSet(124.805832, 46.571381);
        }

        function GetJSMapGps() {

            var gpsX;
            var gpsY;
            gpsX = window.document.getElementById("hdflog").value; //经度
            gpsY = window.document.getElementById("hdflag").value; //纬度
            if (gpsX != null && gpsX != "" & gpsY != null && gpsY != "") {
                appletFrame.s_locationSet(gpsX, gpsY);

            }

        }

    </script>

asp：

protected void Timer1_Tick(object sender, EventArgs e)
    {
        string id = ViewState["mobileid"].ToString();
        if (!string.IsNullOrEmpty(id))
        {
            DataTable dtGps = GBLL.GetList(" imei = '" + id + "' order by intime desc ").Tables[];
            if (dtGps.Rows.Count > )
            {
                string lat  = dtGps.Rows[]["lat"].ToString();
                string lon = dtGps.Rows[]["lon"].ToString();
                hdflog.Value = lon;
                hdflag.Value = lat;
            }
        }
    }
    protected void timersWatch_Click(object sender, EventArgs e)
    {
        Timer1.Interval =  * ;//10秒 开启计时器
    }