将毫秒数添加到JavaScript

Question

我创建了一个需要倒计时的简单游戏。现在一切都很好，但是我需要为计时器添加毫秒。我使用了在Internet上找到的代码，但是它只缺少毫秒。我的尝试没有成功，所以我要向您寻求帮助。

var seconds;
var temp;

function countdown() {
    time = document.getElementById('countdown').innerHTML;
    timeArray = time.split(':')
    seconds = timeToSeconds(timeArray);
    if (seconds == '') {
        temp = document.getElementById('countdown');
        temp.innerHTML = '00:00:00';
        return;
    }
    seconds--;
    temp = document.getElementById('countdown');
    temp.innerHTML = secondsToTime(seconds);
    timeoutMyOswego = setTimeout(countdown, 1000);
}

function timeToSeconds(timeArray) {
    var minutes = (timeArray[0] * 1);
    var seconds = (minutes * 60) + (timeArray[1] * 1);
    return seconds;
}

function secondsToTime(secs) {
    var divisor_for_minutes = secs % (60 * 60);
    var minutes = Math.floor(divisor_for_minutes / 60);
    minutes = minutes < 10 ? '0' + minutes : minutes;
    var divisor_for_seconds = divisor_for_minutes % 60;
    var seconds = Math.ceil(divisor_for_seconds);
    seconds = seconds < 10 ? '0' + seconds : seconds;
    return minutes + ':' + seconds;
}
countdown();