说明

效果

代码

<script language="JavaScript" type="text/javascript">
<!--
if (document.all){
xL=5;
xH=0;
xW=0;
xR=0;
xE=0;
xMY=0;
xMX=0;
xWd=0;
xHd=0;
xF=new Array();
xY=new Array();
xX=new Array();
xS=new Array();
xA=new Array();
xB=new Array();
ini=new Array();
cl=new Array('#fff000','#0000FF','#ff0000','#00ff00','#ff00ff','#ffa500')
document.write('<div id="xouter" style="position:absolute;top:0px;left:0px"><div style="position:relative">');
for (i=0; i < xL; i++){
document.write('<div id="xie" style="position:absolute;top:0;left:0;width:10px;height:10px;'
+'font-family:Courier New;font-size:50px;color:#ffffff">'+Math.round(Math.random()*9)+'</div>');
}
document.write('</div></div>');
//Initial Placement!
function Set(){
for (i=0; i < xL; i++){
xH=window.document.body.offsetHeight;
xW=window.document.body.offsetWidth;
xA[i]=Math.round(Math.random()*xH);
xB[i]=Math.round(Math.random()*xW);
xS[i]=Math.random()*0.07+0.05;
xR=Math.round(Math.random()*3);
xE=Math.round(Math.random()*2500+50)
if (xR == 3) xB[i]=-xE;
if (xR == 2) xB[i]=xW+xE;
if (xR == 1) xA[i]=-xE;
if (xR == 0) xA[i]=xH;
xF[i]=xW/14;
}
}
Set();
function Assign(){
xouter.style.top=document.body.scrollTop;
for (i=0; i < xL; i++){
xF[i]-=xS[i]*50;
if (xF[i] < 4) xF[i]=3;
xie[i].style.top =xY[i];
xie[i].style.left=xX[i];
xie[i].style.fontSize=xF[i];
xie[i].style.filter='glow(color='+ini[i]+', strength='+xF[i]/3+')';
}
}
function fly(){
var N=Math.floor(Math.random()*cl.length)
xMY=window.document.body.clientHeight/2;
xMX=window.document.body.clientWidth/2;
xWd=Math.round(Math.random()*40+5);
xHd=Math.round(Math.random()*30+5);
for (i=0; i < xL; i++)
{
xY[i]=xA[i]+=(xMY-xA[i])*(xS[i]);
xX[i]=xB[i]+=(xMX-xB[i])*(xS[i]);
if ((xX[i] > xMX-xWd) && (xX[i] < xMX+xWd) && (xY[i] > xMY-xHd) && (xY[i] < xMY+xHd)){

xH=window.document.body.offsetHeight;
xW=window.document.body.offsetWidth;
xA[i]=Math.round(Math.random()*xH);
xB[i]=Math.round(Math.random()*xW);
xS[i]=Math.random()*0.05+0.05;
xR=Math.round(Math.random()*3);
xE=Math.round(Math.random()*50+50)
if (xR == 3) xB[i]=-xE;
if (xR == 2) xB[i]=xW+xE;
if (xR == 1) xA[i]=-xE;
if (xR == 0) xA[i]=xH+xE;
}
if ((xX[i] < 0) || (xX[i] > xW) || (xY[i] < 0) || (xY[i] > xH))
{
xF[i]=xW/14;
ini[i]=cl[N];
}
}
Assign();
setTimeout('fly()',10);
}
fly();
}
// -->
</script>