HTML_Practice/function_6.html at master · cheonsong/HTML_Practice · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        var num = 1;
        function gallery(direct){
            if(direct){
                if(num == 8) return;
                num++;
            }
            else{
                if(num == 1) return;
                num--;
            }
            var imgTag = document.getElementById("photo");
            imgTag.setAttribute("src","images/pic_" + num + ".jpg");
        }
    </script>
</head>
<body>
    <div id="galleryZone">
        <p>
            <img src="images/pic_1.jpg" id="photo" alt="">
        </p>
        <p>
            <button onclick="gallery(0)">이전</button>
            <button onclick="gallery(1)">다음</button>
        </p>
    </div>
</body>
</html>