进度条.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>进度条</title>
    <style>
        #progress-bar {
            width: 100%;
            height: 10px;
            background: gainsboro
        }

        #progress-slot {
            transition: all 0.5s;
            background: red;
            height:100%;
        }
    </style>
</head>
<body>
    <div id="progress-bar">
        <div id="progress-slot"></div>
    </div>
    <script>
        let timer = 0;
        function start() {
            const dom = document.getElementById('progress-slot')
            let width = 0;
            timer = setInterval(() => {
                width +=1;
                dom.style.width = width + '%'
                if (width >= 100) {
                    clearInterval(timer)
                }
            }, 150)
        }
        start()
    </script>
</body>
</html>