Javascript Slider Effect01

<section id="sliderType01">
    <div class="slider__wrap">
        <div class="slider__img">
            <div class="slider"><img src="img/images01.jpg" alt="이미지1"></div>
            <div class="slider"><img src="img/images02.jpg" alt="이미지2"></div>
            <div class="slider"><img src="img/images03.jpg" alt="이미지3"></div>
            <div class="slider"><img src="img/images04.jpg" alt="이미지4"></div>
            <div class="slider"><img src="img/images05.jpg" alt="이미지5"></div>
        </div>
    </div>
</section>

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

.slider__img {
    position: relative;
    width: 800px;
    height: 480px;
}

.slider {
    position: absolute;
    left: 0; top: 0;
}

.slider::before {
    position: absolute;
    left: 5px; top: 5px;
    color: #fff;
    padding: 5px 10px 3px;
    background: rgba(0,0,0,0.4);
}

.slider:nth-child(1):before {content: '이미지1';}
.slider:nth-child(2):before {content: '이미지2';}
.slider:nth-child(3):before {content: '이미지3';}
.slider:nth-child(4):before {content: '이미지4';}
.slider:nth-child(5):before {content: '이미지5';}
.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__wrawp")
const sliderImg = document.querySelector(".slider__img")
const slider = document.querySelectorAll(".slider")

console.log(slider[0])

let currentIndex = 0; //현재 보이는 이미지
let sliderCount = slider.length //이미지 갯수

setInterval(() => {
    let nextIndex = (currentIndex + 1) % 5;

    slider[currentIndex].style.opacity = "0" //첫 번째 이미지를 안보이게
    slider[nextIndex].style.opacity = "1" //두 번째 이미지를 안보이게

    // console.log("currentIndex :" + currentIndex)
    // console.log("nextIndex : " + nextIndex)

    slider.forEach(slider => {
        slider.style.transition = "all 0.7s"
    })

    currentIndex = nextIndex;
},2000);