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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="cont">
<div class="timer">
<span id="hour">00</span>
<span>:</span>
<span id="minute">00</span>
<span>:</span>
<span id="second">00</span>
</div>
<div class="cont2">
<button type="submit" id="start" onclick="startimer()">start</button>
<button type="submit" id="stop" onclick="stoptimer()">stop</button>
<button type="submit" id="reset" onclick="resettimer()">reset</button>
</div>
</div>
</body>
<script>
let hour = document.getElementById('hour');
let minute = document.getElementById('minute');
let second = document.getElementById('second');
let hr = 0;
let min = 0;
let sec = 0;
let settimer = false;
let startimer = () => {
settimer = true;
timecycle();
}
let timecycle = () => {
hr = parseInt(hr);
min = parseInt(min);
sec = parseInt(sec);
if (settimer == true) {
sec = sec + 1;
if (sec == 60) {
min = min + 1;
sec = 0;
}
if (min == 60) {
hr = hr + 1;
min = 0;
sec = 0;
}
if (sec < 10) {
sec = '0' + sec;
}
if (min < 10) {
min = '0' + min;
}
if (hr < 10) {
hr = '0' + hr;
}
hour.innerHTML = hr;
minute.innerHTML = min;
second.innerHTML = sec;
setTimeout(timecycle, 1000);
}
}
let stoptimer = () => {
if (settimer == true) {
settimer = false;
}
}
let resettimer = () => {
settimer = false;
hr = 0;
min = 0;
sec = 0;
hour.innerHTML = '00';
minute.innerHTML = '00';
second.innerHTML = '00';
}
</script>
</html>