原生javascript实现放大镜效果

news2025/11/4 15:31:20

效果图

完整代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>放大镜</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .cont{
            width: 640px;
            height: 360px;
            background: url(./images/0b0c64543b70091f66d21fd9cfd80103\ \(1\).jpg)no-repeat 0 0 /100% 100%;
            margin: 50px;
            position: relative;
        }
        .move{
            width: 120px;
            height: 120px;
            background: rgba(0,0,0,0.5);
            position: absolute;
            left: 0;
            top: 0;
            cursor: move;
            display: none;
        }
        .big{
            width: 360px;
            display: none;
            height: 360px;
            position: absolute;
            right: -400px;
            top: 0;
            background: url(./images/0b0c64543b70091f66d21fd9cfd80103\ \(1\).jpg)no-repeat 0 0;
        }
    </style>
</head>
<body>
    <div class="cont">
        <div class="move"></div>
        <div class="big"></div>
    </div>
</body>
</html>
<script>
let cont = document.querySelector('.cont')
let move = document.querySelector('.move')
let big = document.querySelector('.big')

//封装拖拽方法
function drag(){
    cont.onmouseenter =function(){
        move.style.display = 'block';
        big.style.display = 'block';
    }
    cont.onmouseleave =function(){
        move.style.display = 'none';
        big.style.display = 'none';
    }
   cont.onmousemove = function(){
     let mLeft = event.clientX - cont.offsetLeft-move.offsetWidth/2;
     let mTop = event.clientY-cont.offsetTop-move.offsetHeight/2;
        (mLeft<=0)&&(mLeft=0);
        (mTop<=0)&&(mTop=0);
        let maxL = cont.clientWidth - move.offsetWidth;
        let maxT = cont.clientHeight - move.offsetHeight;
        (mLeft>=maxL)&&(mLeft=maxL);
        (mTop>=maxT)&&(mTop=maxT);
        move.style.left = mLeft+'px';
        move.style.top = mTop+'px'
        //调整大图
        let x = mLeft*big.clientWidth/move.offsetWidth
        let y = mTop*big.clientHeight/move.offsetHeight
        big.style.backgroundPosition = `-${x}px -${y}px`
   }
       
    
}
drag();
</script>

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