슬라이드 이펙트05

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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");            //각각 이미지
const sliderDot = document.querySelector(".slider__dot");      //닷 메뉴

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

function init() {
    slider.forEach(() => dotIndex += "<a href='#' class='dot'>이미지1</a>");
    sliderDot.innerHTML = dotIndex;
    // 첫 번째 닷 버튼한테 활성화 표시(active)
    sliderDot.firstChild.classList.add("active");
    //sliderDot.firstElementChild.classList.add("active");
}
init(); //제일 밑에 있을때는 닷 버튼 클릭의 이동이 적용안됨

// 이미지 이동
function gotoSlider(num) {
    sliderInner.style.transition = "all 400ms";
    sliderInner.style.transform = "translateX(" + -sliderWidth * num + "px)";
    currentIndex = num;

    //두번째 이미지 ==> 두번째 닷 클래스 추가
    // 1. 닷 메뉴 클래스 모두 삭제
    // 2. 해당 이미지 해당 닷 메뉴 클래스 추가
    let dotActive = document.querySelectorAll(".slider__dot .dot");
    dotActive.forEach(el => el.classList.remove("active"));
    dotActive[num].classList.add("active");
}

// 버튼 클릭했을 때 
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 {
            gotoSlider(nextIndex);
        }
    });
});

// 닷 버튼 클릭했을 때
document.querySelectorAll(".slider__dot .dot").forEach((dot, index) => {
    dot.addEventListener("click", () => {
        gotoSlider(index);
    });
});

<main id="main">
    <section id="sliderType03">
        <div class="slider__wrap">
            <div class="slider__img">
                <div class="slider__inner">
                    <div class="slider"><img src="../assets/img/effect_bg01-min.jpg" alt="이미지1"></div>
                    <div class="slider"><img src="../assets/img/effect_bg02-min.jpg" alt="이미지2"></div>
                    <div class="slider"><img src="../assets/img/effect_bg03-min.jpg" alt="이미지3"></div>
                    <div class="slider"><img src="../assets/img/effect_bg04-min.jpg" alt="이미지4"></div>
                    <div class="slider"><img src="../assets/img/effect_bg05-min.jpg" alt="이미지5"></div>
                </div>
            </div>
            <div class="slider__btn">
                <a href="#" class="prev">prev</a>
                <a href="#" class="next">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>
    </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;
    /* 총 이미지 6개 */
    height: 450px;
    position: relative;
}

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

.slider::before {
    position: absolute;
    left: 5px;
    top: 5px;
    background: 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: 225px;
    }
}

.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 {
    border-radius: 50%;
    background: rgba(184, 52, 37, 0.615);
}

.slider__btn a.prev {
    left: 0;
}

.slider__btn a.next {
    right: 0;
}

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

.slider__dot .dot {
    width: 20px;
    height: 20px;
    background: rgba(0, 0, 0, 0.4);
    display: inline-block;
    border-radius: 50%;
    text-indent: -9999px;
    transition: all 0.3s;
    margin: 2px;
}

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