<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
list-style: none;
}
body{
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
img{
width: 200px;
}
</style>
</head>
<body>
<img src="宝宝.webp" alt="">
</body>
<script src="js/myWheel.js"></script>
<script>
var img=document.querySelector("img")
var nowScale=1.0 //当前的缩放倍数
var maxScale=3.0 //最大的缩放倍数
var minScale=0.25 //最小的缩放倍数
// 规定：向上滑动 放大；向下滑动 缩小
myWheel(img,function(isDown){
if(isDown){
// 缩小
nowScale-=0.05
nowScale=nowScale<minScale?minScale:nowScale
}else{
// 放大
nowScale+=0.05
nowScale=nowScale>maxScale?maxScale:nowScale
}
img.style.transform=`scale(${nowScale})`
},false)
</script>
</html>