看下这样的JS怎么实现点击放大
怎么实现双击图片的时候放大
<script> window.onload=function(){ var rt=new imgRound("imgContainer",150,100,300,80,230,0.01); setInterval(function(){rt.roundMove()},20) } function imgRound(id,w,h,x,y,r,dv,rh,ah){ if (ah==undefined) ah=1; if (rh==undefined) rh=50; var dv=dv*ah; //旋转速度 var pi=3.1415926575; var d=pi/2; var pd=Math.asin(w/2/r); var smove=true; var imgArr=new Array(); var objectId=id; var o=document.getElementById(objectId); o.style.position="relative"; var arrimg=o.getElementsByTagName("img"); var pn=arrimg.length; //图片数量 var ed=pi*2/pn; for (n=0;n<arrimg.length;n++){ var lk=arrimg[n].getAttribute("link"); if (lk!=null) arrimg[n].setAttribute("title",lk) arrimg[n].onclick=function(){ if (this.getAttribute("link")!=null){ if (this.getAttribute("target")!="_blank") window.location=(this.getAttribute("link")) else window.open(this.getAttribute("link")) } } arrimg[n].onmouseout=function(){smove=true;} arrimg[n].onmouseover=function(){smove=false;} arrimg[n].style.position="absolute"; imgArr.push(arrimg[n]); } this.roundMove=function(){ for (n=0;n<=pn-1;n++){ var o=imgArr[n]; var ta=Math.sin(d+ed*n),strFilter; if (ta<0) o.style.left=Math.cos(d+ed*n-pd)*r+x+"px"; else o.style.left=Math.cos(d+ed*n+pd)*r+x+"px"; o.style.top=ta*rh+rh+y+"px"; var zoom=Math.abs(Math.sin((d+ed*n)/2+pi/4))*0.5+0.5; o.style.width=Math.abs(Math.cos(d+ed*n+pd)-Math.cos(d+ed*n-pd))*zoom*r+"px"; o.style.height=zoom*h+"px"; if (ta<0) {ta=(ta+1)*80+20;o.style.zIndex=0;} else {ta=100;o.style.zIndex=1} if (o.style.zIndex<=0) strFilter="FlipH(enabled:true)" else strFilter="FlipH(enabled:false)"; strFilter=strFilter+" alpha(opacity="+ta+")"; o.style.opacity=ta/100; o.style.filter=strFilter; } if (smove) d=d+dv; } }</script><div id="imgContainer" style="width:600px;height:300px;border:1px solid red"><img src="http://www.idccyw.com/blueidea/images/s1.jpg"/><img src="http://www.idccyw.com/blueidea/images/s2.jpg"/><img src="http://www.idccyw.com/blueidea/images/s3.jpg"/><img src="http://www.idccyw.com/blueidea/images/s4.jpg" /><img src="http://www.idccyw.com/blueidea/images/s5.jpg"/><img src="http://www.idccyw.com/blueidea/images/s1.jpg"/><img src="http://www.idccyw.com/blueidea/images/s2.jpg"/><img src="http://www.idccyw.com/blueidea/images/s3.jpg"/></div><!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><title>图片的放大和缩小</title><meta content="text/html; charset="GB2312" http-equiv="Content-Type" /></head> <body> <div> <input type="button" value="打开" onclick="opened()"/> <input type="button" value="关闭" onclick="closeed()"/> </div> <div id="main"> <img src="12.jpg"/> </div> <script type="text/javascript"> var n=2; var control=true; var stop; var div_main=document.getElementById("main"); var w=div_main.getElementsByTagName("img")[0].width; //alert(w); var h=div_main.getElementsByTagName("img")[0].height; var x=div_main.getElementsByTagName("img")[0].left; //alert(x); var y=div_main.getElementsByTagName("img")[0].top; function opened(){ if(control==true){ if(n>=20){ control=false; window.clearTimeout(stop); }else{ w+=5; h+=5; x+=5; y+=5; div_main.getElementsByTagName("img")[0].width=w; div_main.getElementsByTagName("img")[0].height=h; div_main.getElementsByTagName("img")[0].left=x; div_main.getElementsByTagName("img")[0].top=y; stop=setTimeout('opened()',100); } n++; } } function closeed(){ if(control==false){ if(n<=0){ control=true; window.clearTimeout(stop); }else{ w-=5; h-=5; x-=5; y-=5; div_main.getElementsByTagName("img")[0].width=w; div_main.getElementsByTagName("img")[0].height=h; div_main.getElementsByTagName("img")[0].left=x; div_main.getElementsByTagName("img")[0].top=y; stop=setTimeout('closeed()',100); } n--; }} </script> </body></html>