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");    
const sliderBtnPrev = sliderBtn.querySelector(".prev");    
const sliderBtnNext = sliderBtn.querySelector(".next");

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";
    sliderInner.style.transform = "translateX("+ -sliderWidth * num + "px)";
    currentIndex = num;
}

// 왼쪽 버튼 클릭
sliderBtnPrev.addEventListener("click", ()=>{
    let prevIndex = (currentIndex -1) % sliderCount;
    if (prevIndex == -1){
        prevIndex = 4;
    }
    gotoSlider(prevIndex);
    // 4 3 2 1 0 4 3 2
    // 3 2 1 0 4 3 2 1
});

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

<main id="main">
    <section id="sliderType01">
        <div class="slider__wrap">
            <div class="slider__img">
                <div class="slider__inner">
                    <div class="slider"><img src="../assets/img/effect_img01-min.jpg" alt="이미지1"></div>
                    <div class="slider"><img src="../assets/img/effect_img02-min.jpg" alt="이미지2"></div>
                    <div class="slider"><img src="../assets/img/effect_img03-min.jpg" alt="이미지3"></div>
                    <div class="slider"><img src="../assets/img/effect_img04-min.jpg" alt="이미지4"></div>
                    <div class="slider"><img src="../assets/img/effect_img05-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>
    </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 */
}
.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;
    border-radius: 5px;
}
.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 */
.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;
    border-radius: 5px;
}
.slider__btn a:hover {
    background: rgb(90, 141, 75);
}
.slider__btn a.prev {
    left: 0;
}
.slider__btn a.next {
    right: 0;
}