Javascript计时器输入

Question

var timerElm = document.getElementById("timer");
var startTime = Date.now();
var countDownAmount = 15000; // ms (3603000)
var countDownEnd = startTime + countDownAmount;
var tickAudio = new Audio('https://freesound.org/data/previews/254/254316_4062622-lq.mp3');
var lastSeconds;

function formatTime(hours, minutes, seconds, mseconds) {
    hours = String(hours);
    minutes = String(minutes);
    seconds = String(seconds);
    mseconds = String(mseconds);

    while (mseconds.length < 3) {
        mseconds = "0" + mseconds;
    }
    seconds = (seconds.length < 2) ? "0" + seconds : seconds;
    minutes = (minutes.length < 2) ? "0" + minutes : minutes;
    return hours + "h  " + minutes + "m  " + seconds + "s  " + mseconds + "ms";
}

function updateTimer() {
    var remainingTime = countDownEnd - Date.now();
    var hours = Math.floor(remainingTime / (60 * 60 * 1000));
    var minutes = Math.floor(remainingTime / (60 * 1000)) % 60;
    var seconds = Math.floor(remainingTime / 1000) % 60;
    var mseconds = remainingTime % 1000;

    if(lastSeconds && lastSeconds !== seconds && !hours && !minutes && seconds <= 10) {
        tickAudio.play();
    }
    lastSeconds = seconds;
    
    if (remainingTime < 0) {
        hours = 0;
        minutes = 0;
        seconds = 0;
        mseconds = 0;
    }
    else {
        requestAnimationFrame(updateTimer);
    }
    
    // printout
    timerElm.innerHTML = formatTime(hours, minutes, seconds, mseconds);
}
    
updateTimer();

#timer {
    font-size: 32px;
    text-align: center;
}

<div id="timer"></div>

我有一个JavaScript计时器，可以在最近10秒内播放声音。

我想让我的用户能够在数分钟内在倒数中添加他们想要的任何数量，添加一个输入字段，以及一个休息，暂停，停止按钮。