<!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>
* {
padding: 0px;
margin: 0px;
}
.min {
width: 450px;
height: 450px;
border: 1px solid red;
position: relative;
margin: 20px;
}
.min img {
width: 100%;
height: 100%;
}
.mask {
width: 150px;
height: 150px;
background-color: rgba(170, 182, 11, 0.5);
position: absolute;
left: 0px;
top: 0px;
display: none;
}
.max {
width: 500px;
height: 500px;
border: 1px solid red;
overflow: hidden;
position: absolute;
left: 550px;
top: 110px;
display: none;
}
.maxImg {
position: absolute;
}
</style>
</head>
<body>
<div class="min">
<img src="images/min.jpg" alt="">
<div class="mask"></div>
</div>
<div class="max">
<img src="images/max.jpg" alt="" class="maxImg">
</div>
<script>
var min = document.querySelector('.min');
console.log(min);
var mask = document.querySelector('.mask');
console.log(mask);
var max = document.querySelector('.max');
console.log(max);
var maxImg = document.querySelector('.maxImg');
console.log(maxImg);
min.onmouseover = function() {
mask.style.display = 'block';
max.style.display = 'block';
}
min.onmouseleave = function() {
mask.style.display = 'none';
max.style.display = 'none';
}
min.onmousemove = function(e) {
// 蒙版在小盒子中的位置
var maskX = e.pageX - min.offsetLeft;
var maskY = e.pageY - min.offsetTop;
// 光标在蒙版的中间
maskX = maskX - mask.offsetWidth / 2;
maskY = maskY - mask.offsetHeight / 2;
// 蒙版可以在小盒子上移动的最大距离
var maskMoveX = min.offsetWidth - mask.offsetWidth;
var maskMoveY = min.offsetHeight - mask.offsetHeight;
//如果移动的距离大于最大距离，则就让最大移动距离等于移动的距离
if (maskX > maskMoveX) {
maskX = maskMoveX;
} else if (maskX <= 0) {
maskX = 0;
}
if (maskY > maskMoveY) {
maskY = maskMoveY;
} else if (maskY <= 0) {
maskY = 0;
}
// 设置蒙版的位置
mask.style.left = maskX + 'px';
mask.style.top = maskY + 'px';
// 设置比例关系
var rotateX = maskX / maskMoveX;
var rotateY = maskY / maskMoveY;
maxImg.style.left = -rotateX * (maxImg.offsetWidth - max.offsetWidth) + 'px';
maxImg.style.top = -rotateY * (maxImg.offsetHeight - max.offsetHeight) + 'px';
}
</script>
</body>
</html>
标签：maskX,min,放大镜,max,mask,var,display From： https://www.cnblogs.com/zhaofen/p/17115723.html