WebProgramming/practice9-6.html at main · huheyun/WebProgramming · 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>onwheel</title>
    <script>
        function wheel(e){
            let s=1;
            let img=document.getElementById("img");

            if(e.wheelDelta > 0){
                s+=0.05;
                document.getElementById("img").style.width = img.width*s+"px";
                document.getElementById("img").style.height = img.height*s+"px";
            }
            else if(e.wheelDelta<0){
                s-=0.05;
                document.getElementById("img").style.width = img.width*s+"px";
                document.getElementById("img").style.height = img.height*s+"px";
            }
        }
    </script>
</head>
<body>
    <h2>마우스 휠을 이용한 이미지 확대/축소</h2>
    <hr>
    <p>이미지 위에 휠을 위로 굴리면 이미지가 축소되고 아래로 굴리면 이미지가 확대 됩니다.</p>
    <br>
    <img id="img" src="./images/mango.jpg" onwheel="wheel(event)">
</body>
</html>