用js实现的一个小程序（对一块区域的放大，缩小）

//css

<style type="text/css">

#enlarge1{position:absolute;100px; height:100px; border:1px solid #000;}
#enlarge2{position:absolute; top:100px; 100px; height:200px ;margin-top:20px; border:1px solid #000; }
#enlarge3{position:absolute; top:10px; left:110px;200px; height:312px; margin-left:10px; margin-top:-2px; border:1px solid #000; }
</style>

//html

<div id="enlarge1"></div>
<div id="enlarge2"></div>
<div id="enlarge3"></div>

//js

<script type="text/javascript">
function enlargeFc(id,x,y){
var option=document.getElementById(id);
var optionWidth=option.clientWidth;
var optionHeight=option.clientHeight;

option.onmouseover=function(){
this.style.width=optionWidth*x+"px";
this.style.height=optionHeight*y+"px";
this.style.background="#0f0";
this.style.zIndex=100000;
}
option.onmouseout=function(){
this.style.width=optionWidth+"px";
this.style.height=optionHeight+"px";
this.style.background="";
this.style.zIndex="auto";
}

}
enlargeFc("enlarge2",1,1);
</script>

//效果