Lab2JS/index.html at main · GabrielSpelchuk/Lab2JS · GitHub

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<!DOCTYPE html>
<html lang="uk">
<head>
    <meta charset="UTF-8">
    <title>Світлофор</title>
    <style>
        .light {
            width: 50px;
            height: 50px;
            margin: 10px;
            border-radius: 50%;
            background-color: gray;
        }
    </style>
</head>
<body>

    <h2>Світлофор</h2>
    <div id="red" class="light"></div>
    <div id="yellow" class="light"></div>
    <div id="green" class="light"></div>
    <br>
    <button onclick="changeLight()">Перемкнути</button>

    <script>
        let current = 0;
        const lights = ["red", "yellow", "green"];

        function changeLight() {
            document.getElementById(lights[current]).style.backgroundColor = "gray";
            current = (current + 1) % 3;
            document.getElementById(lights[current]).style.backgroundColor = lights[current];
        }
    </script>

</body>
</html>