示例 23: 在线计时器-CFANZ编程社区

示例 23: 在线计时器
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Online Timer</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            background-color: #f0f2f5;
        }
        .container {
            max-width: 400px;
            margin: 50px auto;
            padding: 20px;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            text-align: center;
        }
        h1 {
            color: #333;
        }
        .timer {
            font-size: 2em;
            margin: 20px 0;
        }
        button {
            padding: 10px;
            border: none;
            border-radius: 5px;
            background-color: #007bff;
            color: white;
            font-size: 1em;
            cursor: pointer;
            margin: 5px;
        }
        button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Online Timer</h1>
        <div id="timer" class="timer">00:00:00</div>
        <button onclick="startTimer()">Start</button>
        <button onclick="stopTimer()">Stop</button>
        <button onclick="resetTimer()">Reset</button>
    </div>
    <script>
        let timer;
        let seconds = 0;

        function updateTimerDisplay() {
            const timerDisplay = document.getElementById('timer');
            const hours = String(Math.floor(seconds / 3600)).padStart(2, '0');
            const minutes = String(Math.floor((seconds % 3600) / 60)).padStart(2, '0');
            const secs = String(seconds % 60).padStart(2, '0');
            timerDisplay.textContent = `${hours}:${minutes}:${secs}`;
        }

        function startTimer() {
            if (!timer) {
                timer = setInterval(() => {
                    seconds++;
                    updateTimerDisplay();
                }, 1000);
            }
        }

        function stopTimer() {
            clearInterval(timer);
            timer = null;
        }

        function resetTimer() {
            clearInterval(timer);
            timer = null;
            seconds = 0;
            updateTimerDisplay();
        }
    </script>
</body>
</html>
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