页面时时刷新数据

setInterval(getLatestData,6000);
    function getLatestData() {
        var url = ctx + "platform/activity/getLatestData";
        $.ajax({
            type: 'post',
            data: {'activityId': activityId },
            dataType: 'json',
            url: url,
            success: function(data){
                console.log(data);
                $("#viewNum").text(data.viewNum);

            }
        });
    }