<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#box {
position: relative;
}
.small_box {
background: darkorchid;
width: 300px;
height: 250px;
border: 1px solid gainsboro;
position: relative;
}
.small {
width: 300px;
height: 250px;
}
.layer {
background: darkorange;
opacity: .5;
width: 150px;
height: 150px;
position: absolute;
top: 0;
left: 0;
display: none;
}
.big_box {
width: 400px;
height: 300px;
border: gainsboro 1px solid;
background: greenyellow;
position: absolute;
top: 0;
left: 300px;
display: none;
overflow: hidden;
}
.big {
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div id="box">
<div class="small_box">
<img src="../../../imgs/4.png" class="small">
<div class="layer"></div>
</div>
<div class="big_box">
<img src="../../../imgs/4.png" class="big">
</div>
</div>
<script>
var box = document.getElementById(‘box‘);
var small_box = document.querySelector(‘.small_box‘);
var small = document.querySelector(‘.small‘);
var layer = document.querySelector(‘.layer‘);
var big_box = document.querySelector(‘.big_box‘);
var big = document.querySelector(‘.big‘);
small_box.addEventListener(‘mouseover‘, function() {
layer.style.display = ‘block‘;
big_box.style.display = ‘block‘;
layer.style.cursor = ‘move‘;
})
small_box.addEventListener(‘mouseout‘, function(e) {
layer.style.display = ‘none‘;
big_box.style.display = ‘none‘;
})
layer.addEventListener(‘mousemove‘, function(e) {
//获得鼠标位置
var layerX = e.pageX - layer.offsetWidth / 2;
var layerY = e.pageY - layer.offsetHeight / 2;
//限制遮盖层X轴的移动位置
layerX = layerX < 0 ? layerX = 0 : layerX;
var maxX = small.offsetWidth - layer.offsetWidth;
layerX = layerX > maxX ? layerX = maxX : layerX;
//限制遮盖层Y轴的移动位置
layerY = layerY < 0 ? layerY = 0 : layerY;
var maxY = small.offsetHeight - layer.offsetHeight;
layerY = layerY > maxY ? layerY = 100 : layerY;
//赋值给layer的 top 和 left
layer.style.left = layerX + ‘px‘;
layer.style.top = layerY + ‘px‘;
// 遮挡层移动距离 layerX 和 layerY
// 遮挡层的最大移动距离 maxX 和 maxY
// 大图片最大移动距离 bigMaxX 和 bigMaxY
var bigMaxX = big.offsetWidth - big_box.offsetWidth;
var bigMaxY = big.offsetHeight - big_box.offsetHeight;
// 大图的移动距离 = 遮挡层移动距离 * 大图片最大移动距离 / 遮挡层的最大移动距离
var bigX = layerX * bigMaxX / maxX;
var bigY = layerY * bigMaxY / maxY;
big.style.left = -bigX + ‘px‘;//因为是反方向移动，所以是 负值
big.style.top = -bigY + ‘px‘;
})
</script>
</body>
</html>
原文地址：https://www.cnblogs.com/qtbb/p/11704822.html
时间： 2024-10-13 03:10:21