放大镜效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .div{
            width: 100px;
            height: 100px;
            background-image: url("timg.jpg");
            background-size: cover;
            position: relative;
        }
        .box{
            width: 100px;
            height: 100px;
            overflow: hidden;
            position: relative;
        }
        .fox{
            width: 50px;
            height: 50px;
            background: rgba(0,0,0,0.5);
            position: absolute;
            top:0;
            left:0;
        }
        img{
            width: 200px;
            height: 200px;
            position: absolute;
            left:0;
            top: 0;
        }
    </style>
</head>
<body>
<div class="div">
    <div class="fox"></div>
</div>
<div class="box">
    <img class="img" src="timg.jpg" alt="">
</div>
<script>
    window.onload=function () {
        var oDiv1=document.getElementsByClassName("div")[0];
        oDiv1.onmousemove=function (ev) {
            var event=window.event||ev
            var x=event.clientX;
            var y=event.clientY;
               var oFox1=document.getElementsByClassName("fox")[0];
            oFox1.style.top=y+"px";
            oFox1.style.left=x+"px";
            var oImg=document.getElementsByClassName("img")[0];
         oImg.style.top=-y*2+"px"
            oImg.style.left=-x*2+"px"
        }
    }
</script>
</body>
</html>

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转载自blog.csdn.net/weixin_42413689/article/details/80923866