JavaScript放大镜(原生写法)

最新推荐文章于 2025-05-22 14:38:07 发布

你是我遥远万里最牵挂的猪

最新推荐文章于 2025-05-22 14:38:07 发布

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分类专栏： javascript 文章标签：前端放大镜js

本文链接：https://blog.youkuaiyun.com/Leejinian888/article/details/95376140

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博客展示了放大镜JS的效果图，与前端技术相关，呈现了该JS实现的视觉效果。

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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">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box {
            width: 800px;
            height: 400px;
            /* border: 1px solid; */
            margin: 50px auto;
            position: relative;
        }

        .box .sm {
            width: 200px;
            height: 200px;
            /* border: 1px solid; */
            position: absolute;
            top: 0;
            left: 0;
        }

        .box .sm img {
            width: 200px;
            height: 200px;
        }

        .box .mask {
            width: 80px;
            height: 80px;
            background: rgba(0, 0, 0, .5);
            position: absolute;
            top: 0;
            left: 0;
            cursor: move;
        }

        .box .big {
            width: 300px;
            height: 300px;
            /* border: 1px solid; */
            position: absolute;
            top: 0;
            left: 300px;
            display: none;
            overflow: hidden;
        }

        .box .big img {
            width: 400px;
            height: 400px;
            position: absolute;
            top: 0;
            left: 0;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="sm">
            <img src="images/1.jpg" alt="">
            <div class="mask"></div>
        </div>
        <div class="big">
            <img src="images/1.jpg" alt="" class="bigimg">
        </div>

    </div>
    <script>
        var sm = document.querySelector(".sm");
        var box = document.querySelector(".box");
        var mask = document.querySelector(".mask");
        var bigimg = document.querySelector(".bigimg");
        var big = document.querySelector(".big");
        // console.log(sm,box,mask,bigimg,big);

        sm.onmouseover = function () {
            big.style.display = "block"
            mask.style.display = "block"
        }
        sm.onmouseout = function () {
            big.style.display = "none"
            mask.style.display = "none"
        }
        sm.onmousemove = function (event) {
            var event = event || window.event;
            var x = event.clientX - box.offsetLeft - mask.offsetWidth / 2;
            var y = event.clientY - box.offsetTop - mask.offsetHeight / 2;
            // console.log(x, y);
            if (x <= 0) {
                x = 0;
            }
            if (x >= sm.offsetWidth - mask.offsetWidth) {
                x = sm.offsetWidth - mask.offsetWidth;
            }
            if (y <= 0) {
                y = 0;
            }
            if (y >= sm.offsetHeight - mask.offsetHeight) {
                y = sm.offsetHeight - mask.offsetHeight;
            }
            mask.style.left = x + "px";
            mask.style.top = y + "px";

            var w = x / (sm.offsetWidth - mask.offsetWidth);
            var h = y / (sm.offsetHeight - mask.offsetHeight);
            // console.log(w, h);

            bigimg.style.left = -w * (bigimg.offsetWidth - big.offsetWidth) + "px";
            bigimg.style.top = -h * (bigimg.offsetHeight - big.offsetHeight) + "px";
        }
    </script>
</body>

</html>

效果图

在这里插入图片描述