day30/11.html at main · githubber-me/day30 · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title> Countdown Timer </title>
</head>
<body>
    <h1>Countdown Timer</h1>
    <div id="timer"></div>
    <button id="startButton">Start</button>
    <button id="stopButton">Stop</button>

    <script>
        const timerElement = document.getElementById("timer");
        const startButton = document.getElementById("startButton");
        const stopButton = document.getElementById("stopButton");
        let countdownInterval;

        startButton.addEventListener("click", startCountdown);
        stopButton.addEventListener("click", stopCountdown);

        function startCountdown() {
            let targetTime = new Date().getTime() + 60000; // 1 minute in the future

            countdownInterval = setInterval(function() {
                let now = new Date().getTime();
                let timeDifference = targetTime - now;

                let minutes = Math.floor((timeDifference % (1000 * 60 * 60)) / (1000 * 60));
                let seconds = Math.floor((timeDifference % (1000 * 60)) / 1000);

                timerElement.textContent = `${minutes.toString().padStart(2, "0")}:${seconds.toString().padStart(2, "0")}`;

                if (timeDifference < 0) {
                    clearInterval(countdownInterval);
                    timerElement.textContent = "Time's up!";
                }
            }, 1000);
        }

        function stopCountdown() {
            clearInterval(countdownInterval);
            timerElement.textContent = "Countdown stopped";
        }
    </script>
</body>
</html>