슬라이드 이펙트05

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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');
const sliderDot = document.querySelector('.slider__dot');

let currentIndex = 0;
let sliderCount = slider.length;
let sliderWidth = sliderImg.offsetWidth; // 이미지 가로 값

let dotIndex = "";
function init() {
    slider.forEach((el, index) => dotIndex += `이미지${index + 1}`);
    sliderDot.innerHTML = dotIndex;

    // 첫 번째 닷 버튼한테 활성화 표시
    sliderDot.firstElementChild.classList.add('active');
}
init();

// 이미지 이동
function gotoSlider(num) {
    sliderInner.style.transition = "all 400ms";
    sliderInner.style.transform = `translateX(${-sliderWidth * num}px)`;
    currentIndex = num;
    
    // 두 번째 이미지 => 두 번째 닷 클래스 추가
    const sliderDotAs = sliderDot.querySelectorAll('a');
    sliderDotAs.forEach((a) => a.classList.remove('active'));
    sliderDotAs[num].classList.add('active');
}

// 버튼 클릭
document.querySelectorAll('.slider__btn a').forEach((btn, index) => {
    btn.addEventListener("click", () => {
        let prevIndex = (currentIndex + sliderCount - 1) % sliderCount;
        let nextIndex = (currentIndex + 1) % sliderCount;

        if(btn.classList.contains("prev")) {
            gotoSlider(prevIndex);
        }
        else if(btn.classList.contains("next")) {
            gotoSlider(nextIndex);
        }
    });
});

// 닷 버튼 클릭
document.querySelectorAll('.slider__dot .dot').forEach((a, index) => {
    a.addEventListener('click', () => {
        gotoSlider(index);
    });
});

<main id="main">
    <section id="sliderType05">
        <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 class="slider__dot">
                    <!-- <a href="#" class="dot active">이미지1</a>
                    <a href="#" class="dot">이미지2</a>
                    <a href="#" class="dot">이미지3</a>
                    <a href="#" class="dot">이미지4</a>
                    <a href="#" class="dot">이미지5</a> -->
                </div>
            </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: 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;
}

.slider__dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 20px;
}

.slider__dot .dot {
    display: inline-block;
    width: 20px;
    height: 20px;
    margin: 3px;
    background: rgba(0,0,0,0.4);
    border-radius: 50%;
    text-indent: -9999px;
    transition: all 0.3s;
}

.slider__dot .dot.active {
    background: rgba(255,255,255,0.9);
}