var xhrTracker = new XMLHttpRequest();
    xhrTracker.onreadystatechange = function(){
        if (xhrTracker.readyState === 4)
        {
            var data;
            try {
                data = JSON.parse(xhrTracker.responseText);
            } catch(e) {
                console.log(e);
            }
            console.log(data);
            if(data.code === 200)
            {
                var byDay = data['data']['data'][0]['tracker_total_by_day'];
                var oDate = new Date();
                var nHrs = (oDate.getHours() < 10) ? '0'+oDate.getHours() : oDate.getHours();
                var nMin = (oDate.getMinutes() < 10) ? '0'+oDate.getMinutes() : oDate.getMinutes();
                var nDate = oDate.getDate();
                var nMnth = (oDate.getMonth() < 10) ? '0'+(oDate.getMonth()+1) : (oDate.getMonth()+1);
                var nYear = oDate.getFullYear();
                document.querySelector('.red_title').innerHTML = 'Tính đến '+nHrs+'h'+nMin+', '+nDate+'/'+nMnth+'/'+nYear+' (Tổng cộng có '+byDay['cases']+' ca nhiễm)';
                document.querySelector('.box-thongke .head').innerHTML = 'Tính đến '+nHrs+'h'+nMin+', '+nDate+'/'+nMnth+'/'+nYear+'. <strong>Nguồn: Bộ Y tế</strong>';
                var byDayEl = document.querySelector('.count-covid');
                byDayEl.querySelector('.nhiem').innerHTML = '<strong>'+byDay['cases']+'</strong>Nhiễm';
                byDayEl.querySelector('.tuvong').innerHTML = '<strong>'+byDay['deaths']+'</strong>Tử vong';
                byDayEl.querySelector('.khoi').innerHTML = '<strong>'+byDay['recovered']+'</strong>Khỏi';
                document.querySelector('.tracker_positive strong').innerHTML = byDay['cases'];
            }
        }
    };
    xhrTracker.open('GET', "https://gw.vnexpress.net/cr/?name=tracker_coronavirus");
    xhrTracker.send();