js实现放大镜
完整版的html,css,js代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="./reset.css">
<style>
.box {
width: 400px;
height: 400px;
margin: 100px 0 0 100px;
}
.content {
width: 400px;
height: 400px;
position: relative;
border: 1px solid #ccc;
}
.content>img {
width: 400px;
height: 400px;
}
.mask {
width: 300px;
height: 300px;
background-color: yellow;
opacity: 0.5;
position: absolute;
top: 0;
left: 0;
border: 1px solid #ccc;
display: none;
}
.big {
width: 500px;
height: 500px;
position: absolute;
top: 0;
left: 410px;
border: 1px solid #ccc;
overflow: hidden;
display: none;
}
.big>img {
width: 800px;
height: 800px;
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div class="box">
<div class="content">
<img src="./2ed149a56d12c2d8.jpg" alt="">
<div class="mask"></div>
<div class="big">
<img src="./2ed149a56d12c2d8.jpg" alt="">
</div>
</div>
</div>
<script>
var content = document.querySelector('.content')
var mask = document.querySelector('.mask')
var big = document.querySelector('.big')
content.addEventListener('mouseenter', function () {
mask.style.display = 'block'
big.style.display = 'block'
})
content.addEventListener('mouseleave', function () {
console.log(1111);
mask.style.display = 'none'
big.style.display = 'none'
})
content.addEventListener('mousemove', function (e) {
var x = e.pageX - content.offsetLeft
var y = e.pageY - content.offsetTop
var maskX = x - mask.offsetWidth / 2
var maskY = y - mask.offsetHeight / 2
console.log(mask.offsetWidth, content.offsetWidth);
var XMAX = content.offsetWidth - mask.offsetWidth
var YMAX = content.offsetHeight - mask.offsetHeight
console.log(maskX, maskY, XMAX);
if (maskX <= 0) {
maskX = 0
} else if (maskX >= XMAX) {
maskX = XMAX
}
if (maskY <= 0) {
maskY = 0
} else if (maskY >= YMAX) {
maskY = YMAX
}
mask.style.left = maskX + 'px'
mask.style.top = maskY + 'px'
var img = document.querySelector('.big>img')
imgXMax = img.offsetWidth - big.offsetWidth
imgYMax = img.offsetHeight - big.offsetHeight
img.style.left = -maskX * imgXMax / XMAX + 'px'
img.style.top = -maskY * imgYMax / YMAX + 'px'
})
</script>
<!-- <script src="./放大镜.js"></script> -->
</body>
</html>
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