HTML：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>放大镜效果</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<div id="box">
<div id="large-box">
<img src="images/1.jpg" id="large-img">
</div>
<div id="middle-box">
<img src="images/1.jpg" id="middle-img">
<div id="shadow"></div>
</div>
<div id="small-box">
<img src="images/1.jpg" class="active">
<img src="images/2.jpg">
<img src="images/3.jpg">
<img src="images/4.jpg">
</div>
</div>
<script src="index.js"></script>
</body>
</html>
CSS：
* {
margin: 0;
padding: 0;
}
body {
background: #000;
}
img {
vertical-align: bottom;
}
#box {
position: relative;
margin: 10px;
padding: 10px;
width: 260px;
background: #fff;
}
#large-box {
display: none;
position: absolute;
top: 0;
left: 290px;
width: 260px;
height: 260px;
overflow: hidden;
}
#large-img {
position: absolute;
width: 520px;
height: 520px;
}
#middle-box {
position: relative;
}
#middle-img {
width: 100%;
}
#shadow {
display: none;
position: absolute;
left: 0;
top: 0;
width: 130px;
height: 130px;
background: rgba(255, 0, 0, .4);
cursor: move;
}
#small-box {
margin-top: 10px;
overflow: hidden;
}
#small-box img{
float: left;
width: 63px;
border: 1px solid #fff;
}
#small-box .active {
border-color: red;
}
js：
function $(id) {
return document.getElementById(id);
}
var oBox = $('box');
var oSmallBox = $('small-box');
var aSmallImg = Array.from(oSmallBox.children);
var oMiddleBox = $('middle-box');
var oMiddleImg = $('middle-img');
console.log(oMiddleImg);
var oLargeBox = $('large-box');
var oLargeImg = $('large-img');
var oShadow = $('shadow');
// 给缩略图添加鼠标进入事件
aSmallImg.forEach( v => {
v.onmouseover = function () {
// 先去掉所有的class名
aSmallImg.forEach(v => v.className = '');
// 当前img添加class
this.className = 'active';
// 改变中型图片的地址
oMiddleImg.src = this.src;
// 改变大型图片的地址
oLargeImg.src = this.src;
};
});
// 遮罩层最大的left和top值
var maxL = 0;
var maxT = 0;
// 大图片最大的left和top值
var maxLargeImgL = 0;
var maxLargeImgT = 0;
// 鼠标进入middle-box
oMiddleBox.onmouseover = function () {
// 显示遮罩层
oShadow.style.display = 'block';
// 显示右侧的盒子
oLargeBox.style.display = 'block';
// 获取最大的left和top值
maxL = oMiddleBox.offsetWidth - oShadow.offsetWidth;
maxT = oMiddleBox.offsetHeight - oShadow.offsetHeight;
maxLargeImgL = oLargeImg.offsetWidth - oLargeBox.offsetWidth;
maxLargeImgT = oLargeImg.offsetHeight - oLargeBox.offsetHeight;
};
// 鼠标离开middle-box
oMiddleBox.onmouseout = function () {
// 显示遮罩层
oShadow.style.display = 'none';
// 显示右侧的盒子
oLargeBox.style.display = 'none';
};
// 给middle-box添加移动事件
oMiddleBox.onmousemove = function (ev) {
var e = ev || window.event;
var iL = e.clientX - oShadow.offsetWidth / 2 - oMiddleBox.offsetLeft - oBox.offsetLeft;
var iT = e.clientY - oShadow.offsetHeight / 2 - oMiddleBox.offsetTop - oBox.offsetTop;
// 限定左侧
if(iL < 0) {
iL = 0;
}
// 限定上侧
if(iT < 0) {
iT = 0;
}
// 限定右侧
if(iL > maxL) {
iL = maxL;
}
// 限定下侧
if(iT > maxT) {
iT = maxT;
}
oShadow.style.left = iL + 'px';
oShadow.style.top = iT + 'px';
// 让大图移动
oLargeImg.style.left = - iL * maxLargeImgL / maxL + 'px';
oLargeImg.style.top = - iT * maxLargeImgT / maxT + 'px';
};
图片更换成自己的路径即可
