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Copy path放大镜.html
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放大镜.html
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<!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>
<style>
body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
}
#image {
width: 300px;
height: 300px;
background-color: #000;
background-image: url(./assets/cat-chilling.jpg);
background-size: 300px 300px;
background-repeat: no-repeat;
}
#image[zoomed] {
background-size: 900px 900px;
background-position: calc(var(--x) * 100%) calc(var(--y) * 100%);
}
</style>
</head>
<body>
<div id="image">
</div>
<div id="scale"></div>
<script>
document.querySelector('#image').addEventListener("mouseenter", enterHandler)
document.querySelector('#image').addEventListener("mousemove", moveHandler)
document.querySelector('#image').addEventListener("mouseleave", leaveHandler)
// 兼容手机版
document.querySelector('#image').addEventListener("touchstart", enterHandler)
document.querySelector('#image').addEventListener("touchmove", moveHandler)
document.querySelector('#image').addEventListener("touchend", leaveHandler)
function enterHandler(e) {
e.target.setAttribute("zoomed", 1)
// 优化移动端
moveHandler(e)
}
function moveHandler(e) {
let rect = e.target.getBoundingClientRect()
// 移动设备
let offsetX, offsetY;
if (['touchstart', 'touchmove', 'touchend'].includes(e.type)) {
console.log(e.touches[0]);
// 多点触控时只采取第一个触点
offsetX = e.touches[0].pageX - rect.left;
offsetY = e.touches[0].pageY - rect.top;
e.preventDefault()
} else {
offsetX = e.offsetX;
offsetY = e.offsetY;
}
let x = offsetX / rect.width;
let y = offsetY / rect.height;
e.target.style.setProperty('--x', x)
e.target.style.setProperty('--y', y)
}
function leaveHandler(e) {
e.target.removeAttribute('zoomed')
moveHandler(e)
}
</script>
</body>
</html>