进度条js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Progress Bar Example</title>
    <style>
        #progressBar {
            width: 100%;
            background-color: #ddd;
        }
        #progress {
            width: 0%;
            height: 30px;
            background-color: #4CAF50;
            text-align: center;
            line-height: 30px;
            color: white;
        }
    </style>
</head>
<body>
    <div id="progressBar">
        <div id="progress">0%</div>
    </div>
    <button onclick="startProgress()">Start Progress</button>

    <script>
        function startProgress() {
            let progress = 0;
            const progressBar = document.getElementById('progress');
            const interval = setInterval(() => {
                if (progress >= 100) {
                    clearInterval(interval);
                } else {
                    progress++;
                    progressBar.style.width = progress + '%';
                    progressBar.textContent = progress + '%';
                }
            }, 50);
        }
    </script>
</body>
</html>