javascript简写效果“神秘的眼睛”

<!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> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>www.gxlcms.com神秘的眼睛脚本之家</title> <style type="text/css"> .eye{ display:inline; overflow:hidden; position:relative; float:left; margin:50px 0 0 50px; width:50px; height:50px; font-size:50px; line-height:106%; +line-height:normal; cursor:default; } @media all and (min-width:0px){ .eye{line-height:normal;} } .pupil{ overflow:hidden; position:absolute; margin:-5px 0 0 -5px; width:10px; height:10px; line-height:normal; font-size:10px; top:50%; left:50%; } </style> </head> <body> ○<span id="leftPupil" class="pupil">●</span> ○<span id="rightPupil" class="pupil">●</span> <input name="" id="xy" type="text" /> <script type="text/javascript"> var $=function(o){return document.getElementById(o)} var leftEye=$("leftEye"); var rightEye=$("rightEye"); var leftPupil=$("leftPupil"); var rightPupil=$("rightPupil"); var xy=$("xy"); document.documentElement.onmousemove=function(e){ var e=window.event||e; var eX=e.clientX, eY=e.clientY; track(leftEye,leftPupil,eX,eY); track(rightEye,rightPupil,eX,eY); } function track(o,i,eX,eY){ var oL=o.offsetLeft; var oT=o.offsetTop; var oW=o.offsetWidth; var oH=o.offsetHeight; var oCW=o.clientWidth; var oCH=o.clientHeight; var oX=oL+oW/2; var oY=oT+oH/2; var eX=eX-oX; var eY=eY-oY; var eXY,iL,iT; if(eX!=0&&eY!=0){ eXY=eX/eY; var r=oCW/2-12; var R=Math.sqrt(eX*eX+eY*eY); var rR=R/5>r?r:R/5; var iL=Math.sqrt(rR*rR/(1+1/(eXY*eXY))); if(eX<0)iL=-iL; var iT=iL/eXY; i.style.left=(iL+oCW/2)+"px"; i.style.top=(iT+oCH/2)+"px"; } xy.value=eX+","+eY; } </script> </body> </html>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]