放大镜 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0px;
            margin: 0px;
        }
        
        .min {
            width: 450px;
            height: 450px;
            border: 1px solid red;
            position: relative;
            margin: 20px;
        }
        
        .min img {
            width: 100%;
            height: 100%;
        }
        
        .mask {
            width: 150px;
            height: 150px;
            background-color: rgba(170, 182, 11, 0.5);
            position: absolute;
            left: 0px;
            top: 0px;
            display: none;
        }
        
        .max {
            width: 500px;
            height: 500px;
            border: 1px solid red;
            overflow: hidden;
            position: absolute;
            left: 550px;
            top: 110px;
            display: none;
        }
        
        .maxImg {
            position: absolute;
        }
    </style>
</head>

<body>
    <div class="min">
        <img src="images/min.jpg" alt="">
        <div class="mask"></div>
    </div>
    <div class="max">
        <img src="images/max.jpg" alt="" class="maxImg">
    </div>
    <script>
        var min = document.querySelector('.min');
        console.log(min);
        var mask = document.querySelector('.mask');
        console.log(mask);
        var max = document.querySelector('.max');
        console.log(max);
        var maxImg = document.querySelector('.maxImg');
        console.log(maxImg);
        min.onmouseover = function() {
            mask.style.display = 'block';
            max.style.display = 'block';
        }
        min.onmouseleave = function() {
            mask.style.display = 'none';
            max.style.display = 'none';
        }
        min.onmousemove = function(e) {
            // 蒙版在小盒子中的位置
            var maskX = e.pageX - min.offsetLeft;
            var maskY = e.pageY - min.offsetTop;
            // 光标在蒙版的中间
            maskX = maskX - mask.offsetWidth / 2;
            maskY = maskY - mask.offsetHeight / 2;
            // 蒙版可以在小盒子上移动的最大距离
            var maskMoveX = min.offsetWidth - mask.offsetWidth;
            var maskMoveY = min.offsetHeight - mask.offsetHeight;
            //如果移动的距离大于最大距离，则就让最大移动距离等于移动的距离
            if (maskX > maskMoveX) {
                maskX = maskMoveX;
            } else if (maskX <= 0) {
                maskX = 0;
            }
            if (maskY > maskMoveY) {
                maskY = maskMoveY;
            } else if (maskY <= 0) {
                maskY = 0;
            }
            // 设置蒙版的位置
            mask.style.left = maskX + 'px';
            mask.style.top = maskY + 'px';
            // 设置比例关系
            var rotateX = maskX / maskMoveX;
            var rotateY = maskY / maskMoveY;
            maxImg.style.left = -rotateX * (maxImg.offsetWidth - max.offsetWidth) + 'px';
            maxImg.style.top = -rotateY * (maxImg.offsetHeight - max.offsetHeight) + 'px';
        }
    </script>
</body>

</html>

 

posted @ 2023-02-13 11:22  芬-mi  阅读(43)  评论(0)    收藏  举报