<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>放大镜特效</title>
</head>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#main{
position: relative;
}
#main2{
position: relative;
}
.smallimg{
width:300px;
height: 300px;
position: absolute;
top: 50px;
left: 50px;
}
.mark{
width:100px;
height:100px;
position: absolute;
z-index: 100;
top: 0;
background:rgba(0,0,0,.6);
display: none;
cursor: move;
}
.bigimg{
position: absolute;
top:50px;
left:400px;
width:300px;
height: 300px;
overflow: hidden;
display: none;
}
.img1{
width:300px;
height:300px;
display: block;
}
.img2{
width: 900px;
height: 900px;
display: block;
}
</style>
<body>
<div ;
}
Show.prototype.show=function(event){
var e=e||window.event;
this.L=e.clientX-this.smallimg.offsetLeft-this.mark.offsetWidth/2;
this.T=e.clientY-this.smallimg.offsetTop-this.mark.offsetHeight/2;
this.minL=0;
this.minT=0;
this.maxL=this.smallimg.offsetWidth-this.mark.offsetWidth;
this.maxT=this.smallimg.offsetHeight-this.mark.offsetHeight;
if(this.L<this.minL){
this.L=0;
}else if(this.L>this.maxL){
this.L=this.maxL;
}
if(this.T<this.minT){
this.T=0;
}else if(this.T>this.maxT){
this.T=this.maxT;
}
this.mark.style.left=this.L+'px';
this.mark.style.top=this.T+'px';
this.img2.style.marginLeft=this.L*-3+'px';
this.img2.style.marginTop=this.T*-3+'px';
}
//实现继承
/*function Show2(id){
Show.call(this,id);
}
for(var i in Show.prototype){
Show2.prototype[i]=Show.prototype[i];
}*/
window.onload=function(){
var show=new Show('main');
//var show2=new Show2('main2');
}
</script>
</html>
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