lovecoding
/
Web1020


			
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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">
    <title>Document</title>
    <style>
        .small-img{
            width: 600px;
            height: 600px;
            position: relative;
            float: left;
        }
        .small-img img{
            width: 600px;
            height: 600px;
            position: absolute;
            top: 0;
            left: 0;
        }
        .small-img .box{
            width: 300px;
            height: 300px;
            background-color: #fff;
            opacity: 0.5;
            position: absolute;
            top: 0;
            left:0;
        }
        .big-img{
            margin-left: 100px;
            float: left;
            width: 600px;
            height: 600px;
            overflow: hidden;
            position: relative;
        }
        .big-img img{
            width: 1200px;
            height: 1200px;
            position: absolute;
            top: 0;
            left: 0;
        }
    </style>
</head>
<body>
    <div class="small-img">
        <img src="./image/niu.png" alt="img">
        <div class="box"></div>
    </div>
    <div class="big-img">
        <img class="big-pic" src="./image/niu.png" alt="img">
    </div>
    <script>
        var oSmallImg = document.getElementsByClassName("small-img")[0];
        var oBox = document.getElementsByClassName("box")[0];
        var oBigImg = document.getElementsByClassName("big-pic")[0];

        oSmallImg.onmousemove = function(e){
            var x = e.clientX - 150;
            var y = e.clientY - 150;

            // 控制半透明蒙版左侧最小值范围
            if(x<0){
                x = 0;
            }
            // 控制半透明蒙版顶部最小值范围
            if(y<0){
                y = 0;
            }
            // 控制半透明蒙版右侧最大值范围
            if(x>=300){
                x = 300
            }
            // 控制半透明蒙版顶部最大值范围
            if(y>=300){
                y = 300
            }


            oBox.style.left = x + "px";
            oBox.style.top = y + "px";
            oBigImg.style.left = -2*x + "px";
            oBigImg.style.top = -2*y + "px";
        }
    </script>
</body>
</html>