我们将整个布局分三个部分，第一部分为主题的小图片，将他放在整个布局的左上角；第二部分是下边的图片列表，直接跟在小图片的下边；最后一部分是放大镜显示部分，将其定位到小图片的右边。
然后就是利用js添加基本事件（包括鼠标的移入移出等）详细的内用见如下代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
ul{
list-style: none;
padding: 0;
}
.zoom-box{
width: 452px;
position: relative;
}
.small-box{
position: relative;
border: 1px solid #ccc;
}
.small-box img{
width: 100%;
height: 100%;
}
.small-box .square{
position: absolute;
left: 0;
top: 0;
background: yellow;
opacity: 0.5;
/*display: none;*/
}
.small-box .mask{
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
.img-list ul::after{
clear: both;
content: '';
display: table;
}
.img-list ul li{
float: left;
margin: 0 10px;
padding: 6px;
}
.img-list img{
border: 2px solid transparent;
}
.img-list img.active{
border: 2px solid red;
}
.big-box{
position: absolute;
top: 0;
left: 100%;
margin-left: 2px;
border: 1px solid #cccccc;
width: 500px;
height: 500px;
overflow: hidden;
display: none;
}
.big-box img{
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<!-- 布局-->
<div><!-- 容器-->
<div><!-- 小图片容器-->
<img src="../img/magnifier/m1.jpg" alt=""/>
<div></div><!-- 鼠标选中框-->
<div></div><!-- 鼠标悬浮位置-->
</div>
<div><!-- 图片列表-->
<ul>
<li><img src="../img/magnifier/s1.jpg" alt="" data-small="../img/magnifier/m1.jpg"
data-big="../img/magnifier/b1.jpg"/></li>
<li><img src="../img/magnifier/s2.jpg" alt="" data-small="../img/magnifier/m2.jpg"
data-big="../img/magnifier/b2.jpg"/></li>
<li><img src="../img/magnifier/s3.jpg" alt="" data-small="../img/magnifier/m3.jpg"
data-big="../img/magnifier/b3.jpg"/></li>
<li><img src="../img/magnifier/s4.jpg" alt="" data-small="../img/magnifier/m4.jpg"
data-big="../img/magnifier/b4.jpg"/></li>
<li><img src="../img/magnifier/s5.jpg" alt="" data-small="../img/magnifier/m5.jpg"
data-big="../img/magnifier/b5.jpg"/></li>
</ul>
</div>
<div><!-- 放大镜-->
<img src="../img/magnifier/b1.jpg" alt=""/>
</div>
</div>
<script>
//获取要操作的元素
var smallbox = $('.small-box .mask');
var smallimg = $('.small-box img');
var square = $('.square');
var bigbox = $('.big-box');
var bigimg = $('.big-box img');
var imgs = $all('.img-list img');
//鼠标经过图片列表显示被选中，实现图片切换
for(var i = 0; i < imgs.length; i++){
imgs[i].onmouseover = function(){
for(var j = 0; j < imgs.length; j++){
imgs[j].className = '';
}
this.className = 'active';
//改变对应的图片链接
smallimg.src = this.getAttribute('data-small');
bigimg.src = this.getAttribute('data-big');
};
}
//鼠标移入放大器显示并设置选中框的大小
smallbox.onmouseover = function(){
square.style.display = 'block';
bigbox.style.display = 'block';
//位置w/smallimg.w = bigbox.w/bigimg.w
square.style.width = bigbox.offsetWidth * smallimg.offsetWidth/bigimg.offsetWidth + 'px';
square.style.height = bigbox.offsetHeight * smallimg.offsetHeight/bigimg.offsetHeight + 'px';
};
//鼠标移出放大器隐藏
smallbox.onmouseout = function(){
square.style.display = 'none';
bigbox.style.display = 'none';
};
//放大器移动
//获取鼠标的位置
smallbox.onmousemove = function(ev){
var oEvent = ev || event;
var x = oEvent.offsetX - square.offsetWidth/2;
var y = oEvent.offsetY - square.offsetHeight/2;
if(x < 0){
x = 0;
}
if(x > smallbox.offsetWidth - square.offsetWidth){
x = smallbox.offsetWidth - square.offsetWidth;
}
if(y < 0){
y = 0;
}
if(y > smallbox.offsetHeight - square.offsetHeight){
y = smallbox.offsetHeight - square.offsetHeight;
}
//给选中框定位
square.style.left = x + 'px';
square.style.top = y + 'px';
//给放大器定位 x/? = smallimg.w/bigimg.w
bigimg.style.top = -y * bigimg.offsetWidth/smallimg.offsetWidth + 'px';
bigimg.style.left = -x * bigimg.offsetHeight/smallimg.offsetHeight + 'px';
};
//通过名称查找某个元素
function $(name){
return document.querySelector(name);
}
//通过名称查找相同的一组数据
function $all(name){
return document.querySelectorAll(name);
}
</script>
</body>
</html>总结：
到这里这个放大镜效果就完成了，相信小伙伴们对此也是有了自己的理解与认识，希望对你的工作有所帮助！
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