js放大镜效果例子

来源：互联网发布：党员信仰知乎编辑：程序博客网时间：2024/05/16 05:09

只需要更改图片地址就可以实现放大镜效果

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>

<style type="text/css">
#div1 {
width: 304px;
height: 222px;
position: relative;
margin: 30px auto 0px;
}
#div1 img {
width: 304px;
height: 222px;
}
#div1 span {
width: 100px;
height: 100px;
background: red;
left: 0px;
top: 0px;
position: absolute;
display: none;
filter:alpha(opacity:20);
opacity: 0.2;
}
.show {
width: 100%;
height: 100%;
background: red;
position: absolute;
z-index: 10px;
filter:alpha(opacity:10);
opacity: 0.1;
left: 0px;
top: 0px;
}
#div2 {
width: 304px;
height: 222px;
position: relative;
display: none;
overflow: hidden;
margin: 0px auto 0px;
}
#img1 {
position: absolute;
}
</style>

<script type="text/javascript">
window.onload=function ()
{
var oDiv=document.getElementById('div1');
var oShow=oDiv.getElementsByTagName('div')[0];
var oSpan=oDiv.getElementsByTagName('span')[0];
var oImg=document.getElementById('img1');
oShow.onmouseover=function()
{
oSpan.style.display='block';
oImg.parentNode.style.display='block';
};
oShow.onmouseout=function()
{
oSpan.style.display='none';
oImg.parentNode.style.display='none';
};
oShow.onmousemove=function(ev)
{
var oEvent=ev||event;
var x=oEvent.clientX-oDiv.offsetLeft-oSpan.offsetWidth/2;
var y=oEvent.clientY-oDiv.offsetTop-oSpan.offsetHeight/2;

if(x<0)
{
x=0;
}
else if(x>oShow.offsetWidth-oSpan.offsetWidth)
{
x=oShow.offsetWidth-oSpan.offsetWidth;
}
if(y<0)
{
y=0;
}
else if(y>oShow.offsetHeight-oSpan.offsetHeight)
{
y=oShow.offsetHeight-oSpan.offsetHeight
}
oSpan.style.left=x+'px';
oSpan.style.top=y+'px';
var percentX=x/(oShow.offsetWidth-oSpan.offsetWidth);
var percentY=y/(oShow.offsetHeight-oSpan.offsetHeight);
var oImgparent=oImg.parentNode;
oImg.style.left=-percentX*(oImg.offsetWidth-oImgparent.offsetWidth)+'px';
oImg.style.top=-percentY*(oImg.offsetHeight-oImgparent.offsetHeight)+'px';
};
};
</script>

<div id="div1">
<img src="11_2_2.jpg" />
<span></span>
<div class="show"></div>
</div>

<div id="div2">
<img id="img1" src="11_2_2.jpg" />
</div>

</body>
</html>

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