슬라이드 이펙트04

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// const sliderWrap = document.querySelector('.slider__wrap');
const sliderImg = document.querySelector('.slider__img');
const sliderInner = document.querySelector('.slider__inner');
const slider = document.querySelectorAll('.slider');
const sliderBtn = document.querySelector('.slider__btn');
const sliderBtnPrev = sliderBtn.querySelector('.prev');
const sliderBtnNext = sliderBtn.querySelector('.next');

let currentIndex = 0;
let sliderCount = slider.length;
let sliderWidth = sliderImg.offsetWidth; 

// 이미지 움직이는 영역
function gotoSlider(num) {
    sliderInner.style.transition = `all 400ms`;
    sliderInner.style.transform = `translateX(${-sliderWidth * num}px)`;
    currentIndex = num;
}
// 왼쪽 버튼 클릭
sliderBtnPrev.addEventListener('click', () => {
    /* 01
    currentIndex--; 
    if(currentIndex < 0) currentIndex = sliderCount - 1;
    gotoSlider(currentIndex);
    */

    /* 02
    --currentIndex < 0 ? gotoSlider(sliderCount - 1) : gotoSlider(currentIndex);
    */
    
    /* 03 */
    // 0(currentIndex) => 4(nextIndex)
    // 4(currentIndex) => 3(nextIndex)
    // 3(currentIndex) => 2(nextIndex)
    // 2(currentIndex) => 1(nextIndex)
    // 1(currentIndex) => 0(nextIndex)
    // 0(currentIndex) => 4(nextIndex)
    let prevIndex = (currentIndex + (sliderCount - 1)) % sliderCount;
    gotoSlider(prevIndex);
});

// 오른쪽 버튼 클릭
sliderBtnNext.addEventListener('click', () => {
    let nextIndex = (currentIndex + 1) % slider.length;
    console.log(currentIndex, nextIndex)
    gotoSlider(nextIndex);
});

<section id="sliderType04">
    <div class="slider__wrap">
        <div class="slider__img">
            <div class="slider__inner">
                <div class="slider" role="group" aria-label="1/5"><img src="../asset/img/effect_img02.jpg"
                        alt="이미지1"></div>
                <div class="slider" role="group" aria-label="2/5"><img src="../asset/img/effect_img04.jpg"
                        alt="이미지3"></div>
                <div class="slider" role="group" aria-label="3/5"><img src="../asset/img/effect_img06.jpg"
                        alt="이미지5"></div>
                <div class="slider" role="group" aria-label="4/5"><img src="../asset/img/effect_img08.jpg"
                        alt="이미지7"></div>
                <div class="slider" role="group" aria-label="5/5"><img src="../asset/img/effect_img10.jpg"
                        alt="이미지9"></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>
    </div>
</section>

/* 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: 450px;
    overflow: hidden;
}

.slider__inner {
    /* 이미지를 감싸고 있는 부모 : 움직이는 부분 */
    display: flex;
    flex-wrap: wrap;
    width: 4800px;
    /* transform: translateX(-1000px); */
}

.slider {
    /* 개별적인 이미지 */
    position: relative;
    width: 800px;
    height: 450px;
}

.slider::before {
    position: absolute;
    left: 5px;
    top: 5px;
    background-color: rgba(143, 142, 142, 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';
}

/* @media(max-width : 800px) {
    .slider__img {
        width: 400px;
        height: 225px;
    }
} */

.slider__btn a {
    display: block;
    width: 50px;
    height: 50px;
    color: #fff;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.4);
    text-align: center;
    line-height: 50px;
    transition: all 0.2s;
    padding: 10px;
    box-sizing: content-box;
}

.slider__btn a:hover {
    border-radius: 50%;
    background: rgba(241, 96, 86, 1);
}

.slider__btn a.prev {
    left: 0px;
}

.slider__btn a.next {
    right: 0px;
}