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front-end-method-tool-set
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big.html

<!DOCTYPE html>

<html>
<head>
    <style>
        * {
            margin: 0 ;
            padding: 0;
        }
        .wrap {
            display: block;
            width: 400px;
            margin: 50px;
            position: relative;
            border: 1px solid #ccc;

        }

        .small-box {
            /* position: relative; */
            z-index: 1;
        }

        .float-box {
            display: none;
            width: 160px;
            height: 120px;
            position: absolute;
            background: #ffffcc;
            border: 1px solid #ccc;
            opacity: 0.5;
            pointer-events: none;
        }

        .mark {
            position: absolute;
            display: block;
            width: 400px;
            height: 225px;
            background-color: #fff;
            opacity: 0;
            z-index: 10;
        }

        .small-img {
            width: 400px;
            display:block;
        }


        .big-box {
            display: none;
            position: absolute;
            top: 0;
            left: 460px;
            width: 400px;
            height: 300px;
            overflow: hidden;
            border: 1px solid #ccc;
            z-index: 1;
            pointer-events: none;
        }

        .big-box img {
            position: absolute;
            z-index: 5
        }

    </style>
</head>

<body>

    <div class="wrap">

        <!-- 小图 -->
        <div class="small-box">
            <!-- 放大镜 -->
            <div class="float-box">鼠标上去的蒙层部分</div>
            <img src="./image/big.jpg" class='small-img'/>
        </div>


        <!-- 显示 -->
        <div class="big-box">
            <img class="big-img" src="./image/big.jpg"/>
        </div>

    </div>
</body>

<script>

window.onload = function () {

    var objWrap = document.querySelector(".wrap");

    var objSmallBox = document.querySelector(".small-box");
    var smallImg = document.querySelector(".small-img");
    var objFloatBox = document.querySelector(".float-box");


    var objBigBox = document.querySelector(".big-box");
    var objBigBoxImage = document.querySelector(".big-img");


    //移入事件
    smallImg.onmouseover = function () {
        objFloatBox.style.display = "block"
        objBigBox.style.display = "block"
    }
    //移出事件
    smallImg.onmouseout = function () {
        objFloatBox.style.display = "none"
        objBigBox.style.display = "none"
    }

    //移动事件
    smallImg.onmousemove = function (e) {

        var left = e.clientX- objWrap.offsetLeft - objFloatBox.offsetWidth / 2;
        var top = e.clientY - objWrap.offsetTop - objFloatBox.offsetHeight / 2;

        console.log('--------left--------', left);
        console.log('--------top--------', top);

        if (left < 0) {
            left = 0;
        } else if (left > (objSmallBox.offsetWidth - objFloatBox.offsetWidth)) {
            left = objSmallBox.offsetWidth - objFloatBox.offsetWidth;
        }  if (top < 0) {
            top = 0;
        } else if (top > (objSmallBox.offsetHeight - objFloatBox.offsetHeight))  {
            top = objSmallBox.offsetHeight - objFloatBox.offsetHeight;
        }


        /* 放大镜的位置 */
        objFloatBox.style.left = left + "px";
        objFloatBox.style.top = top + "px";


        /* 计算百分比 */
        var percentX = left / (objSmallBox.offsetWidth - objFloatBox.offsetWidth);
        var percentY = top / (objSmallBox.offsetHeight - objFloatBox.offsetHeight);

        console.log('objBigBoxImage.offsetWidth===',  objBigBoxImage.offsetWidth, objBigBox.offsetWidth);
        /* 显示图片相对应位置 */
        objBigBoxImage.style.left = - percentX * (objBigBoxImage.offsetWidth - objBigBox.offsetWidth) + "px";
        objBigBoxImage.style.top = - percentY * (objBigBoxImage.offsetHeight - objBigBox.offsetHeight) + "px";
    }
}


</script>
</html>