<!DOCTYPE html>
<
html
lang
=
"en"
>
<
head
>
<
meta
charset
=
"UTF-8"
>
<
title
>JS实现放大镜效果</
title
>
<
style
>
#small{
width: 700px;
height: 340px;
position: absolute;
left: 70px;
top: 100px;
}
#small img{
width: 100%;
height: 100%;
}
#mark{
width: 200px;
height: 200px;
position: absolute;
opacity: 0.5;
filter: alpha(opacity=50);
left: 0px;
top: 0px;
display: none;
}
#big{
width: 400px;
height: 400px;
border: 1px solid black;
left: 800px;
top: 100px;
position: absolute;
overflow: hidden;
display: none;
}
#big img{
width: 1400px;
height: 680px;
position: absolute;
left: 0px;
top: 0px;
}
</
style
>
<
script
>
window.onload = function(){
var oSmall = document.getElementById("small");
var oBig = document.getElementById("big");
var oMark = document.getElementById("mark");
var oBigImg = oBig.getElementsByTagName("img")[0];
oSmall.onmouseover = function(){
oMark.style.display = "block";
oBig.style.display = "block";
}
oSmall.onmouseout = function(){
oMark.style.display = "none";
oBig.style.display = "none";
}
oSmall.onmousemove = function(ev){
var e = ev || window.event;
var l = e.clientX - oSmall.offsetLeft - 100;
if(l <= 0){
l = 0;
}
if(l >= (700-200)){
l = 500;
}
var t = e.clientY - oSmall.offsetTop - 100;
if(t <= 0){
t = 0;
}
if(t >= (340-200)){
t = 140;
}
oMark.style.left = l + 'px';
oMark.style.top = t + 'px';
/* 右边图片移动方向与左边图片方向相反且成倍数移动 */
oBigImg.style.left = l * -2 + 'px';
oBigImg.style.top = t * -2 + 'px';
}
}
</
script
>
</
head
>
<
body
>
<
div
id
=
"small"
>
<
img
src
=
"/*照片路径*/"
alt
=
"怎么回事"
>
<
div
id
=
"mark"
></
div
>
</
div
>
<
div
id
=
"big"
>
<
img
src
=
"/*照片路径*/"
alt
=
"怎么回事"
>
</
div
>
</
body
>
</
html
>