JS网页特效:星空飞入效果

原文链接:http://www.cnblogs.com/softmans/p/7422938.html

<html>
<head>
<title>星空极速飞入效果</title>
<style type="text/css">
<!--
body {
background-color: #000066;
}
-->
</style>
</head>
<body>
<script language="JavaScript">
xL=8;
xH=xW=xR=xE=xMY=xMX=xWd=xHd=0;
xF=new Array();
xY=new Array();
xX=new Array();
xS=new Array();
xA=new Array();
xB=new Array();
ini=new Array();
document.write('<div id="sdiv" style="position:absolute;top:0px;left:0px"><div style="position:relative">');
for (i=0; i < xL; i++){
 document.write('<div id="div" style="position:absolute;top:0;left:0;width:5px;height:5px;'+'font-size:10px;color:#ffffff">.</div>');
}
document.write('</div></div>');
function Set(){
 for (i=0; i < xL; i++){
  transfer(i)
  xF[i]=xW/14;
 }
}
function Assign(){
 sdiv.style.top=document.body.scrollTop;
 for (i=0; i < xL; i++){
  xF[i]-=xS[i]*25;
  if (xF[i] < 4) xF[i]=3;
  div[i].style.top =xY[i];
  div[i].style.left=xX[i];
  div[i].style.fontSize=xF[i];
 }
}
function fly(){
 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)){
   transfer(i)
  }
  if ((xX[i]<0)||(xX[i]>xW)||(xY[i]<0)||(xY[i]>xH)){
    xF[i]=xW/14;
  }
 }
 Assign();
 setTimeout('fly()',1);
}
function transfer(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()*0.05+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;
}
Set();
fly();
</script>
</body>
</html>

转载于:https://www.cnblogs.com/softmans/p/7422938.html

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