js实现网页飞入星星的效果

作者：简简单单 2014-09-08

提示：您可以先修改部分代码再运行

<html>
<head>
<title>星空极速飞入效果</title>
<style type="text/<a href="http://www.111com.net/cssdiv/css.html" target="_blank">css</a>">

</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;'+'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></td>
	  </tr>
	</table>

提示：您可以先修改部分代码再运行

js实现网页飞入星星的效果

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