슬라이드 이펙트 04

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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 = document.querySelector(".prev");       // 왼쪽 버튼
const sliderBtnNext = document.querySelector(".next");       // 오른쪽 버튼

let currentIndex = 0;                       // 현재 이미지
let sliderCount = slider.length;            // 이미지 개수
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 클릭했을 때
sliderBtnPrev.addEventListener("click", () => {
    let prevIndex = (currentIndex + sliderCount - 1) % sliderCount;
    
    gotoSlider(prevIndex);
    // 0 4 3 2 1
});
// 오른쪽 버튼 클릭했을 때
sliderBtnNext.addEventListener("click", () => {
    let nextIndex = (currentIndex + 1) % sliderCount;

    gotoSlider(nextIndex);
    //0 1 2 3 4 
});

<body class="img08">
    <header id="header">
        <h1>JAVASCRIPT SLIDER EFFECT 04</h1>
        <p>슬라이드 이펙트 ④ - 좌우로 움직이기 버튼(연속적으로)</p>
        <ul>
            <li><a href="sliderEffect01.html">01</a></li>
            <li><a href="sliderEffect02.html">02</a></li>
            <li><a href="sliderEffect03.html">03</a></li>
            <li class="active"><a href="sliderEffect04.html">04</a></li>
            <li><a href="sliderEffect05.html">05</a></li>
            <li><a href="sliderEffect06.html">06</a></li>
            <li><a href="sliderEffect07.html">07</a></li>
        </ul>
    </header>
    <!-- // header -->

    <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_bg10.jpg" alt="이미지1"></div>
                        <div class="slider"><img src="../assets/img/effect_bg01.jpg" alt="이미지2"></div>
                        <div class="slider"><img src="../assets/img/effect_bg03.jpg" alt="이미지3"></div>
                        <div class="slider"><img src="../assets/img/effect_bg02.jpg" alt="이미지4"></div>
                        <div class="slider"><img src="../assets/img/effect_bg04.jpg" alt="이미지5"></div>
                    </div>
                </div>
            </div>
        </section>
    </main>
    <!-- // main -->

    <footer id="footer">
        <div class="modal__wrap">
        </div>
    </footer>
    <!-- // footer -->
</body>

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

@media (max-width: 800px) {
    .slider__img {
        width: 400px;
        height: 224px;
    }
}

.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 ease;
    display: block;
    color: #fff;
}
.slider__btn a:hover {
    background: rgba(241,96,86,1);
    border-radius: 50px;
}
.slider__btn a.prev {
    left: 0;
}
.slider__btn a.next {
    right: 0;
}