Slider Effect 02 - Javascript

<main>
    <div class="slider-wrap">
        <div class="slider-img">
            <div class="slider-inner">
                <div class="slider" data-name="이미지1"><img src="../assets/img/bg04.jpg" alt="이미지1"></div>
                <div class="slider" data-name="이미지2"><img src="../assets/img/bg05.jpg" alt="이미지2"></div>
                <div class="slider" data-name="이미지3"><img src="../assets/img/bg06.jpg" alt="이미지3"></div>
                <div class="slider" data-name="이미지4"><img src="../assets/img/bg07.jpg" alt="이미지4"></div>
                <div class="slider" data-name="이미지5"><img src="../assets/img/bg08.jpg" alt="이미지5"></div>
            </div>
        </div>
    </div>
</main>

.slider-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.slider-img img {
    width: 100%;
}

.slider-img {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 480px;
    overflow: hidden;
}

.slider-inner {
    position: relative;
    width: 4000px;
    height: 480px;
    overflow: hidden;
    transition: all .6s;
    left: 0;
}

.slider-inner .slider {
    float: left;
    width: 800px;
    height: 480px;
    position: relative;
}

.slider::before {
    position: absolute;
    left: 5px;
    top: 5px;
    background: rgba(0, 0, 0, .4);
    color: #fff;
    padding: 5px 10px 3px;
    line-height: 1.3;
    font-family: "NEXONLv1Gothic";
    content: attr(data-name);
}

.slider:nth-child(1) {
    z-index: 5;
}

.slider:nth-child(2) {
    z-index: 4;
}

.slider:nth-child(3) {
    z-index: 3;
}

.slider:nth-child(4) {
    z-index: 2;
}

.slider:nth-child(5) {
    z-index: 1;
}

const sliderWrap = document.querySelector('.slider-wrap');
const sliderImg = sliderWrap.querySelector('.slider-img');
const sliderInner = sliderImg.querySelector('.slider-inner');
const slider = sliderInner.querySelectorAll('.slider');

let currentIndex = 0;
let sliderCount = slider.length;
let sliderInterval = 3000;
let sliderDuration = 600;

setInterval(function () {
    //3초에 한번씩 왼쪽으로 800px을 이동 시켜야 함
    (currentIndex < sliderCount - 1) ? currentIndex++ : currentIndex = 0;

    let sliderPosition = (currentIndex * -800) + 'px';

    sliderInner.style.left = sliderPosition;
}, sliderInterval);