商品图片放大镜效果

京东商品页面中的放大镜效果实现

技术::html+ css + js

效果图:

商品图片放大镜效果

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>商品图片放大镜</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        img {
            vertical-align: top;
        }

        .box {
            width: 350px;
            height: 350px;
            margin: 100px;
            border: 1px solid #ccc;
            position: relative;
        }

        .big {
            position: absolute;
            width: 450px;
            height: 450px;
            top: 0;
            left: 355px;
            border: 1px solid #ccc;
            overflow: hidden;
            display: none;
        }
        .small {
            position: relative;
        }
        .mask {
            width: 100px;
            height: 100px;
            background-color: rgba(255, 255, 0, 0.4);
            position: absolute;
            top: 0;
            left: 0;
            cursor: move;
            display: none;
        }

        .big img {
            position: absolute;
            top: 0;
            left: 0;
        }
    </style>
</head>
<body>
<div class="box" id="fdj">
    <div class="small" id="small">
        <img src="images/small.jpg" alt="">
        <div class="mask" id="mask"></div>
    </div>
    <div class="big" id="big">
        <img src="images/big.jpg" alt="">
    </div>
</div>
</body>
</html>

<script>
    var fdj = document.getElementById("fdj");
    var small = fdj.children[0];
    var big = fdj.children[1];
    var mask = document.getElementById("mask");
    var bigImg = big.children[0];

    small.onmouseover = function () {
        big.style.display = "block";
        mask.style.display = "block";
    }

    small.onmouseout = function () {
        big.style.display = "none";
        mask.style.display = "none";
    }

    //鼠标在小盒子中移动
    var x = 0, y = 0;
    small.onmousemove = function (event) {
        var event = event || window.event;
        x = event.clientX  - this.offsetParent.offsetLeft  - mask.offsetWidth / 2;
        y = event.clientY - this.offsetParent.offsetTop - mask.offsetHeight / 2;
        //四个判断放置小黄盒子拖动越界
        if (x < 0) {
            x = 0;
        }
        if (x > small.offsetWidth - mask.offsetWidth) {
            x = small.offsetWidth  - mask.offsetWidth;
        }
        if (y < 0) {
            y = 0;
        }
        if (y >small.offsetHeight - mask.offsetHeight) {
            y = small.offsetHeight - mask.offsetHeight;
        }
        mask.style.left = x + "px";
        mask.style.top = y + "px";

        //根据比例移动大盒子的位置,实现放大效果
        bigImg.style.left = -x * big.offsetWidth /small.offsetWidth  +"px";
        bigImg.style.top = -y * big.offsetWidth /small.offsetWidth  +"px";
    }

</script>

 

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