슬라이드 이펙트04

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const sliderWrap = document.querySelector(".slider__wrap");
const sliderImg = document.querySelector(".slider__img");       //보여지는 영역
const sliderInner = document.querySelector(".slider__inner");   //움직이는 영역
const slider = document.querySelectorAll(".slider");            //각각의 이미지
const sliderBtn = document.querySelector(".slider__btn");            //버튼
const sliderBtnPrev = sliderBtn.querySelector(".prev");            //왼쪽버튼
const sliderBtnNext = sliderBtn.querySelector(".next");            //오른쪽버튼

let currentIndex = 0;                       //현재 이미지
let sliderCount = slider.length             //이미지 갯수
let sliderWidth = sliderImg.offsetWidth;    //이미지 가로값

//이미지 움직이는 영역
function gotoSlider(num) {
    sliderInner.style.transition = "all 400ms";     //400ms -> 0.4s
    sliderInner.style.transform = "translateX(" + -sliderWidth * num + "px)";
    currentIndex = num;
}

//왼쪽 버튼 클릭했을 때
sliderBtnPrev.addEventListener("click", () => {
    let prevIndex = (currentIndex + (sliderCount - 1)) % sliderCount;   //4,3,2,1,0 반복시키기 위해 +4
    gotoSlider(prevIndex);

    console.log(currentIndex) //4,3,2,1,0,4,3,2,1,0 반복
});

//오른쪽 버튼 클릭했을 때
sliderBtnNext.addEventListener("click", () => {
    let nextIndex = (currentIndex + 1) % sliderCount;
    gotoSlider(nextIndex);
    //0, 1, 2, 3, 4
});

<main id="main">
    <section id="sliderType03">
        <div class="slider__wrap">
            <div class="slider__img">
                <div class="slider__inner">
                    <div class="slider" role="group" aria-label="1/5"><img src="../assets/img/effect_bg16-min.jpg"
                            alt="이미지1"></div>
                    <div class="slider" role="group" aria-label="2/5"><img src="../assets/img/effect_bg17-min.jpg"
                            alt="이미지2"></div>
                    <div class="slider" role="group" aria-label="3/5"><img src="../assets/img/effect_bg18-min.jpg"
                            alt="이미지3"></div>
                    <div class="slider" role="group" aria-label="4/5"><img src="../assets/img/effect_bg19-min.jpg"
                            alt="이미지4"></div>
                    <div class="slider" role="group" aria-label="5/5"><img src="../assets/img/effect_bg20-min.jpg"
                            alt="이미지5"></div>
                </div>
            </div>
            <div class="slider__btn">
                <a href="#" class="prev" role="button" aria-label="왼쪽 이미지">prev</a>
                <a href="#" class="next" role="button" aria-label="오른쪽 이미지">next</a>
            </div>
        </div>
    </section>
</main>

/* slider */
.slider__wrap {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slider__img {
    /* 이미지 보이는 영역 */
    position: relative;
    width: 800px;
    height: 520px;
    overflow: hidden;
}

.slider__inner {
    /* 이미지를 감싸고 있는 부모 : 움직이는 부분 */
    display: flex;
    flex-wrap: wrap;
    width: 4800px;
    /* 총 이미지 6개 */
    height: 520px;
}

.slider {
    /* 개별적인 이미지 */
    position: relative;
    width: 800px;
    height: 520px;
}

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

.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(6)::before {
    content: '이미지1';
}

.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;
}

@media (max-width: 800px) {
    .slider__img {
        width: 400px;
        height: 260px;
    }

    #header {
        line-height: 1.4;
    }
}

.slider__btn a {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(0, 0, 0, 0.4);
    text-align: center;
    line-height: 50px;
    transition: all 0.2s;
    display: block;
    color: #fff;
}

.slider__btn a:hover {
    background: rgb(101, 56, 52);
    border-radius: 50%;
}

.slider__btn a.prev {
    left: 0;
}

.slider__btn a.next {
    right: 0;
}