জাভাস্ক্রিপ্ট setInterval

<!DOCTYPE html>
<html>
<body>

<button onclick="start()">চালু</button>
<button onclick="window.clearInterval(timer)">থামান</button>

<p id="result">ওয়েটিং</p>

<script>
let timer;
let count = 0;

function start() {
  timer = window.setInterval(() => {
    result.textContent = "কাউন্ট " + ++count;
  }, 1000);
}
</script>

</body>
</html>