尝试将计时器格式化为5:00而不是500

我正在尝试制作一个计时器，它真的很好用。

我应该如何在数字之间加一个：它们是一种简单的方法吗？

它当前显示为500，并向下计数，工作正常。我想让它像这样显示5:00，有什么简单的方法可以快速输入这一个字符吗？

我只想让它从五分钟倒计时到零。

或者我必须以不同的方式格式化计时器才能做到这一点。

var timer;
var time = 500;
function startTimer() {
timer = setInterval(countdown, 1000);
}
function countdown() {
time--;
var timeText = document.getElementById('timer');
if (time === 499) {
time = 459;
} else if (time === 399) {
time = 359;
} else if (time === 299) {
time = 259;
} else if (time === 199) {
time = 159;
} else if (time === 99) {
time = 59;
}

if (time > 0) {
timeText.innerHTML = time;
} else {
clearInterval(timer);
timeText.innerHTML = 'end';
}
}
function nextPage() {
clearInterval(timer);
sessionStorage.setItem('timerem', time);
window.open('02page2.html', "_self");
}
function loadTimer() {
var timeText = document.getElementById('timer');
if (sessionStorage.getItem('timerem') === null) {
timeText.innerHTML = 'ERROR';
} else {
time = sessionStorage.getItem('timerem');
timeText.innerHTML = time;
timer = setInterval(countdown, 1000);
}
}
startTimer()

<span id="timer"></span>

怎么样

const formatTime = num => (num/100).toFixed(2).replace(".",":");

const formatTime = num => (num/100).toFixed(2).replace(".",":");

var timer;
var time = 500;
function startTimer() {
timer = setInterval(countdown, 1000);
}
function countdown() {
time--;
var timeText = document.getElementById('timer');
if (time === 499) {
time = 459;
} else if (time === 399) {
time = 359;
} else if (time === 299) {
time = 259;
} else if (time === 199) {
time = 159;
} else if (time === 99) {
time = 59;
}

if (time > 0) {
timeText.innerHTML = formatTime(time);
} else {
clearInterval(timer);
timeText.innerHTML = 'end';
}
}
function nextPage() {
clearInterval(timer);
sessionStorage.setItem('timerem', time);
window.open('02page2.html', "_self");
}
function loadTimer() {
var timeText = document.getElementById('timer');
if (sessionStorage.getItem('timerem') === null) {
timeText.innerHTML = 'ERROR';
} else {
time = sessionStorage.getItem('timerem');
timeText.innerHTML = formatTime(time)
timer = setInterval(countdown, 1000);
}
}
startTimer()

<span id="timer"></span>

没有页面更改和会话存储的代码的较短版本-会话存储不会在堆栈片段中运行。

这是使用实际时间

const timeText = document.getElementById('timer');
let timer;
let time = 5*60*1000; // 5 minutes in millisecs
function startTimer() {
clearInterval(timer); // in case of restart
timer = setInterval(countdown, 1000);
}
function countdown() {
time-=1000;
const mmss = new Date(time).toISOString().substr(14, 5)
if (time > 0) {
timeText.textContent = mmss
} else {
clearInterval(timer);
timeText.innerHTML = 'end';
}
}
startTimer()

<span id="timer"></span>

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
var timer;
var time = 500;
function startTimer() {
timer = setInterval(countdown, 1000);
}
function countdown() {
time--;
var timeText = document.getElementById('timer');

if (time > 0) {
timeText.innerHTML = (time/100).toFixed(2).replace(".",":");
} else {
clearInterval(timer);
timeText.innerHTML = 'end';
}
}
function nextPage() {
clearInterval(timer);
sessionStorage.setItem('timerem', time);
window.open('02page2.html', "_self");
}
function loadTimer() {
var timeText = document.getElementById('timer');
if (sessionStorage.getItem('timerem') === null) {
timeText.innerHTML = 'ERROR';
} else {
time = sessionStorage.getItem('timerem');
timeText.innerHTML = (time/100).toFixed(2).replace(".",":");
timer = setInterval(countdown, 1000);
}
}
startTimer()

</script>
</head>
<body>
<span id="timer"></span>
</body>
</html>

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