import log from 'loglevel'; import $ from 'jquery'; const updateCountdown = () => $.getJSON({ url: "api/v1/countdown/070f478f-e168-488c-918e-adb37c9c0cbd", data: Date.now(), success: function(countdown) { if(countdown.left <= 0) { clearInterval(scheduledUpdater); $('#clock').text(0); return; } let floor = Math.floor(countdown.left); let frac = countdown.left - floor; let milli = Math.floor(frac * 1000); // get in millisecond resolution setTimeout(() => $('#clock').text(floor), milli); } }); let scheduledUpdater = setInterval(updateCountdown, 1000);