放大鏡效果就是把鼠標(biāo)移到圖片上的時(shí)候，旁邊會(huì)有另外一張大的圖片展示，放大鏡效果，那這樣的效果怎樣實(shí)現(xiàn)的呢，我把代碼發(fā)給大家，請(qǐng)大家參考。
!DOCTYPE html>
html lang="en">
head>
meta charset="UTF-8">
title>放大鏡/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坐標(biāo)
var niubi2=e.clientY-offsetTL(minbox).top-meng.clientHeight/2;//蒙板的Y坐標(biāo)
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>
希望本文所述對(duì)大家javascript程序設(shè)計(jì)有所幫助。