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本文实例讲述了jQuery实现的放大镜效果。分享给大家供大家参考，具体如下：
zoom.css：
*{
padding: 0;
margin: 0;
}
li{
list-style-type: none;
}
.zoom{
margin: 50px;
position: relative;
}
.zoomMiddle{
border: 1px solid #ccc;
width: 300px;
height: 300px;
margin-bottom: 3px;
position: relative;
}
.zoomMiddle img{
width: 300px;
height: 300px;
}
.mask{
width: 100px;
height: 100px;
background: #abcdef;
opacity:0.4;
position: absolute;
left: 0;
top: 0;
display: none;
}
.zoomSmall{
-overflow: hidden;
width: 302px;
height: 54px;
}
.zoomSmall span{
float: left;
height: 52px;
line-height: 52px;
width: 10px;
text-align: center;
border: 1px solid #ccc;
cursor: pointer;
}
.zoomSmall span.disable{
cursor: default;
background: #ccc;
}
.wrapSmallImg{
float: left;
height: 54px;
width: 232px;
/*background: #f00;*/
position: relative;
overflow: hidden;
}
.wrapSmallImg ul{
width: 348px;
/*background: #f00;*/
position: absolute;
left: 0;
top: 0;
}
.wrapSmallImg ul li{
float: left;
width: 50px;
height: 50px;
border: 2px solid #ccc;
margin: 0 2px;
_display: inline;
cursor: pointer;
}
.wrapSmallImg ul li.current{
border: 2px solid orange;
}
.wrapSmallImg ul li img{
width: 50px;
height: 50px;
}
.zoomLarge{
width: 350px;
height: 350px;
border: 1px solid #ccc;
position: absolute;
top: 0;
left: 320px;
overflow: hidden;
display:none;
}
.zoomLarge img{
width: 600px;
height:600px;
position: absolute;
left: 0;
top: 0;
}
zoom.html：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>放大镜</title>
<link rel="stylesheet" href="zoom.css">
</head>
<body>
<input type="text" name="" id="">
<div class="zoom">
<div class="zoomMiddle">
<img src="1.jpg" alt="">
<div class="mask"></div>
</div>
<div class="zoomSmall">
<span class="left disable"><</span>
<div class="wrapSmallImg">
<ul>
<li class="current"><img src="1.jpg" alt=""></li>
<li><img src="2.jpg" alt=""></li>
<li><img src="3.jpg" alt=""></li>
<li><img src="4.jpg" alt=""></li>
<li><img src="5.jpg" alt=""></li>
<li><img src="6.jpg" alt=""></li>
</ul>
</div>
<span class="right">></span>
</div>
<div class="zoomLarge"><img src="1.jpg" alt=""></div>
</div>
<script src="jquery.js"></script>
<script src="zoom.js"></script>
</body>
</html>
zoom.js：
$(function(){
var smallImgLi = $('.wrapSmallImg ul li');
var smallImgLiLength = smallImgLi.size();
var smallImgLiWidth = smallImgLi.outerWidth(true);
var smallImgUl = $('.wrapSmallImg ul');
var leftBtn = $('span.left');
var rightBtn = $('span.right');
var now = 0;
var zoomMiddleDiv = $('.zoomMiddle');
smallImgLi.mouseover(function(){
$(this).addClass('current').siblings().removeClass('current');
var thisSrc = $(this).children('img').attr('src');
$('.zoomMiddle img').attr('src',thisSrc);
$('.zoomLarge img').attr('src',thisSrc);
});
rightBtn.click(function(){
//当now=2的时候，我们不希望再让他滚动了
leftBtn.removeClass('disable');
if(now>=smallImgLiLength-4){
$(this).addClass('disable');
now = smallImgLiLength-4;
}else{
now++;
smallImgUl.animate({'left':-now*smallImgLiWidth},300);
}
});
leftBtn.click(function(){
if(now==0){
now=0;
}else{
now--;
smallImgUl.animate({'left':'+='+smallImgLiWidth},300);
}
});
zoomMiddleDiv.mousemove(function(e){
$('.mask').show();
$('.zoomLarge').show();
zoomMiddleDivOffset = zoomMiddleDiv.offset();
var x = e.pageX - zoomMiddleDivOffset.left - $('.mask').width()/2;
var y = e.pageY - zoomMiddleDivOffset.top - $('.mask').height()/2;
if(x<=0){
x=0;
}else if(x>=zoomMiddleDiv.width()-$('.mask').width()){
x = zoomMiddleDiv.width()-$('.mask').width();
}
if(y<=0){
y=0;
}else if(y>=zoomMiddleDiv.height()-$('.mask').height()){
y = zoomMiddleDiv.height()-$('.mask').height();
}
var percentageX = x/(zoomMiddleDiv.width()-$('.mask').width());
var percentageY = y/(zoomMiddleDiv.height()-$('.mask').height());
$('.zoomLarge img').css({
left:-percentageX*(600-$('.zoomLarge').width()),
top:-percentageY*(600-$('.zoomLarge').height())
});
$('input').val(percentageX+','+percentageY)
$('.mask').css({
'left':x+'px',
'top':y+'px'
});
});
zoomMiddleDiv.mouseout(function(){
$('.mask').hide();
$('.zoomLarge').hide();
});
});
效果图如下：
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希望本文所述对大家jQuery程序设计有所帮助。