export function now() {
    var d = new Date();
    var year = d.getFullYear();
    var month = change(d.getMonth() + 1);
    var day = change(d.getDate());
    var hour = change(d.getHours());
    var minute = change(d.getMinutes());
    var second = change(d.getSeconds());
    function change(t) {
        if (t < 10) {
            return "0" + t;
        } else {
            return t;
        }
    }
    return year + '-' + month + '-' + day + ' ' + hour + ':' + minute + ':' + second;
}

export function timeFormat(usedTime) {
    let hour = 0, minute = 0, second = 0, sumTime = usedTime;
    if (sumTime) {
        if (sumTime >= 3600) {
            hour = Math.floor(sumTime / 3600) % 24;
            sumTime = (sumTime % 3600);
        }
        if (sumTime >= 60) {
            minute = Math.floor(sumTime / 60);
            sumTime = sumTime % 60;
        }
        second = Math.floor(sumTime);
    }
    function getTimeStr(val) {
        return val < 10 ? '0' + val : val;
    }
    return getTimeStr(hour) + ':' + getTimeStr(minute) + ':' + getTimeStr(second);
}

export function prefixIntrger(num, length) {
    return (Array(length).join('0') + num).slice(-length);
}