放大镜效果就是把鼠标移到图片上的时候，旁边会有另外一张大的图片展示，放大镜效果，那这样的效果怎样实现的呢，我把代码发给大家，请大家参考。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>放大镜</title>
<style>
*{margin:0;padding: 0;}
#warp{width: 1184px;height:500px;margin:50px auto 0;background-color: #ccc;overflow: hidden;padding: 10px;position: relative;}
#warp #minbox{width: 350px;height: 350px;float: left;position: relative;}
#maxbox{width: 400px;height: 400px;position: absolute;left: 380px;overflow: hidden;display: none;}
#maxbox img{width: 800px;height: 800px;position: absolute;}
#con{float: left;margin-left: 20px;}
#meng{width: 175px;height: 175px;position: absolute;background-color:yellow;opacity:0.4;filter:alpha(opacity=40);left: 0;top: 0;display: none;}
</style>
</head>
<body>
<div id="warp">
<div id="minbox">
<img src="images/min.jpg" alt="">
<p id="meng"></p>
</div>
<div id="maxbox">
<img src="images/max.jpg" alt="">
</div>
<div id="con">
<img src="images/msg.png" alt="">
</div>
</div>
<script>
var minbox=document.getelementbyid('minbox');
var meng=document.getelementbyid('meng');
var maxbox=document.getelementbyid('maxbox');
var maximg=maxbox.getelementsbytagname('img')[0];
var minimg=minbox.getelementsbytagname('img')[0];
function offsettl(obj){
var ofl=0,oft=0;
while(obj){
ofl+=obj.offsetleft+obj.clientleft;
oft+=obj.offsettop+obj.clienttop;
obj=obj.offsetparent;
}
return{left:ofl,top:oft};
}
minbox.onmousemove=function(e){
var e=e||window.event;
meng.style.display='block';
maxbox.style.display='block';
var niubi1=e.clientx-offsettl(minbox).left-meng.clientwidth/2;//蒙板的x坐标
var niubi2=e.clienty-offsettl(minbox).top-meng.clientheight/2;//蒙板的y坐标
var bili=maximg.clientwidth/minimg.clientwidth;
if (niubi1<=0) {
niubi1=0;
}else if (niubi1>=minbox.clientwidth-meng.clientwidth) {
niubi1=minbox.clientwidth-meng.clientwidth;
}
if (niubi2<=0) {
niubi2=0;
}else if (niubi2>=minbox.clientheight-meng.clientheight) {
niubi2=minbox.clientheight-meng.clientheight;
}
console.log(niubi1);
console.log(niubi2);
meng.style.left=niubi1+'px';
meng.style.top=niubi2+'px';
maximg.style.left=-parseint(meng.style.left)*bili+'px';
maximg.style.top=-parseint(meng.style.top)*bili+'px';
}
minbox.onmouseout=function(){
meng.style.display='none';
maxbox.style.display='none';
}
</script>
</body>
</html>
效果如下：
希望本文所述对大家javascript程序设计有所帮助。
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