Jquery实现图片放大镜效果的思路及代码(自写)

网上一大堆限制多,文档也难看懂,而且麻烦~自己写了个。大笑

算法:

第一步:

放大图片的位置=鼠标所在的容器的宽或者高除以容器自身的高度和宽度,求出鼠标在容器中移动的百分比

第二部:

得到百分比之后

x=-(x百分比*图片的宽度-显示容器的宽度/2);

y=-(y百分比*图片的高度-显示容器的高度/2);

两个参数,x和y,就是大图的位置了,后面加了个显示容器的大小/2 是为了保证图片显示在中间。

效果图:
Jquery实现图片放大镜效果的思路及代码(自写) 
代码:

代码如下:

<!DOCTYPE HTML> 
<html> 
<head> 
<title>商品信息</title> 
</head> 
<style> 

html,body,img,a,div{ 
margin: 0px; 
padding: 0px; 
border: 0px; 
font: 12px/150% Arial,Verdana,"宋体"; 
color: rgb(102, 102, 102); 
} 

div:after { 
clear: both; 
content: '.'; 
height:0; 
visibility: hidden; 
diplay: block; 
} 

div { 
zoom: 1; 
} 
.main-body{ 
text-align: center; 
padding: 15px; 
} 
.head-box{ 
height: 400px; 
border: #CCC 1px solid; 
} 
.head-box-left{ 
width: 300px; 
height: 390px; 
/*border: #CCC 1px solid;*/ 
float: left; 
padding: 3px; 
position: relative; 
} 
.head-box-right{ 
width: 500px; 
height: 390px; 
border: #CCC 1px solid; 
float: left; 
margin-left: 10px; 
} 
.goods-max-img{ 
width: 300px; 
height: 300px; 
display:block; 
border: #CCC 1px solid; 
position: relative; 
cursor: move; 
} 
.goods-img-list{ 
width: 300px; 
height: 80px; 

margin-top: 10px; 
} 

.goods-change{ 
display: block; 
float: left; 
width: 17px; 
height: 54px; 
background: url("../web/imgs/goods-change-btn.png"); 
} 
.change-prev{ 
margin-right: 5px; 
margin-left: 2px; 
} 
.change-prev:HOVER{ 
background-position: -34px 0px; 
} 
.change-next{ 
margin-left: 5px; 
background-position: -17px 0px; 
} 
.change-next:HOVER{ 
margin-left: 5px; 
background-position: -51px 0px; 
} 

.goods-img-list-box{ 
width: 250px; 
height: 54px; 
/*border:1px #CCC solid;*/ 
border: 0px 1px; 
float: left; 
position: relative; 
overflow: hidden; 
} 
.goods-img-list-box ul{ 
margin: 0px; 
padding: 0px; 
position: absolute; 
top: 1px; 
left: 0px; 
width: 500px; 
} 
.goods-img-list-box ul li{ 
display: block; 
float: left; 
width: 50px; 
height: 50px; 
border: #CCC 1px solid; 
margin-left: 3px; 
} 
.goods-img-list-box ul li a{ 
display: block; 
width: 100%; 
height: 100%; 
text-decoration: none; 
} 
.preview-box{ 
position: absolute; 
top: 0px; 
width: 500px; 
height: 500px; 
background-color: white; 
border: #CCC 1px solid; 
left: 310px; 
display: none; 
overflow: hidden; 
} 

</style> 
<script type="text/javascript"> 

$(function(){ 

$(".goods-max-img").mousemove(function(event){ 
$(".preview-box").show(); 
//计算百分比 
var x=event.screenX; 
var y=event.screenY; 
x-=$(this).offset().left; 
y=y-$(this).offset().top-65; 
//得出比例 
x=(x/300).toFixed(2); 
y=(y/300).toFixed(2); 

//250 容器的大小/2 
x=-($("#preview-img").width()*x-250); 
y=-($("#preview-img").height()*y-250); 

$("#preview-img").css('top',y+'px'); 
$("#preview-img").css('left',x+'px'); 
document.title=x+","+y; 
}); 

$(".goods-max-img").mouseout(function(){ 
$(".preview-box").hide(); 
}); 

}); 

</script> 
<body> 
<div class="main-body"> 

<!-- 头部信息 --> 
<div class="head-box"> 

<!-- 头部左侧信息 --> 
<div class="head-box-left"> 
<!-- 商品大图 --> 
<a class="goods-max-img"> 
<img width="100%" height="100%" alt="加载中..." src="http://pic.desk.chinaz.com/file/201211/5/shierybizi7.jpg"> 
</a> 
<div class="preview-box"> 
<div style="width: 500px;height: 500px;overflow: hidden;"> 
<img id="preview-img" style="position: absolute;" alt="加载中..." src="http://pic.desk.chinaz.com/file/201211/5/shierybizi7.jpg"> 
</div> 
</div> 
<!-- 大图结束 --> 
<!-- 图片列表 --> 
<div class="goods-img-list"> 
<a href="javascript:void();" class="goods-change change-prev" title="上一张"></a> 
<div class="goods-img-list-box"> 
<ul> 
<li><a href="javascript:void()">8</a></li> 
<li><a href="javascript:void()">7</a></li> 
<li><a href="javascript:void()">6</a></li> 
<li><a href="javascript:void()">5</a></li> 
<li><a href="javascript:void()">3</a></li> 
<li><a href="javascript:void()">3</a></li> 
<li><a href="javascript:void()">2</a></li> 
</ul> 
</div> 
<a href="javascript:void();" class="goods-change change-next" title="下一张"></a> 
</div> 
<!-- 图片列表结束 --> 
</div> 
<!-- 头部左侧信息结束 --> 

<div class="head-box-right"></div> 
</div> 
<!-- 头部信息结束 --> 

<!-- 主体内容 --> 
<div class="body-content"> 

</div> 
<!-- 主体内容结束 --> 
</div> 
</body> 
</html>

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