Write javascript code to create advertisement banner with different images

<script>
    var images = [
        "./assets/img/1.jpg",
        "./assets/img/2.jpg",
        "./assets/img/3.jpg",
        "./assets/img/4.jpg",
        "./assets/img/5.jpg"
    ];

    var num = 0;
    function next() {
        var slider = document.getElementById("slider");
        num++;
        if (num >= images.length) {
            num = 0;
        }
        slider.src = images[num];
    }

    function prev() {
        var slider = document.getElementById("slider");
        num--;
        if (num < 0) {
            num = images.length - 1;
        }
        slider.src = images[num];
    }

    function slider() {
        window.setInterval(() => next(), 1000);
    }
</script>