Javascript/example_changeImg03.html at main · ksj2001/Javascript · GitHub

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<!DOCTYPE html>
<html lang="kr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="galleryZone">
        <div><img src="images/pic_1.jpg" id='photo' alt=""></div>
        <div class="btn">
            <button type="button">이전</button>
            <button type="button">다음</button>
        </div>
    </div>
    <script>
        let imgNum = 1;
        let img = document.querySelector("#photo");
        let btn = document.querySelectorAll(".btn button");

        for(let i=0;i<btn.length;i++){
            btn[i].addEventListener("click",() => {
                if(i===1){
                    if(imgNum===8) return;
                    imgNum++;
                    console.log("다음"+i);
                }
                else{
                    if(imgNum===1) return;
                    imgNum--;
                    console.log("이전"+i);
                }
                img.setAttribute('src',`images/pic_${imgNum}.jpg`);
            });
        }

    </script>
</body>
</html>