下大雨效果的网页背景，你肯定喜欢_页面背景特效

让网页下大雨的效果，纯javascript实现，还不错啊，这雨下得真够大的！！相信你会喜欢的……

<html>
<head>
<title>下雨效果的网页背景</title>
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312">
</head>
<body>
<script language="JavaScript">
<!--
var no = 50;
var speed = 1;
var ns4up = (document.layers) ? 1 : 0;
var ie4up = (document.all) ? 1 : 0;
var s, x, y, sn, cs;
var a, r, cx, cy;
var i, doc_width = 800, doc_height = 600;
if (ns4up) {
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
else
if (ie4up) {
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
x = new Array();
y = new Array();
r = new Array();
cx = new Array();
cy = new Array();
s = 8;
for (i = 0; i < no; ++ i) {  
initRain();
if (ns4up) {
if (i == 0) {
document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
document.write("top=\"1\" visibility=\"show\"><font color=\"red\">");
document.write(",</font></layer>");
}
else {
document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
document.write("top=\"1\" visibility=\"show\"><font color=\"red\">");
document.write(",</font></layer>");
   }
}
else 
if (ie4up) {
if (i == 0) {
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
document.write("visible; TOP: 15px; LEFT: 15px;\"><font color=\"red\">");
document.write(",</font></div>");
}
else {
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
document.write("visible; TOP: 15px; LEFT: 15px;\"><font color=\"red\">");
document.write(",</font></div>");
      }
   }
}
function initRain() {
a = 6;
r[i] = 1;
sn = Math.sin(a);
cs = Math.cos(a);
cx[i] = Math.random() * doc_width + 1;
cy[i] = Math.random() * doc_height + 1;
x[i] = r[i] * sn + cx[i];
y[i] = cy[i];
}
function makeRain() {
r[i] = 1;
cx[i] = Math.random() * doc_width + 1;
cy[i] = 1;
x[i] = r[i] * sn + cx[i];
y[i] = r[i] * cs + cy[i];
}
function updateRain() {
r[i] += s;
x[i] = r[i] * sn + cx[i];
y[i] = r[i] * cs + cy[i];
}
function raindropNS() {
for (i = 0; i < no; ++ i) {
updateRain();
if ((x[i] <= 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
document.layers["dot"+i].top = y[i];
document.layers["dot"+i].left = x[i];
}
setTimeout("raindropNS()", speed);
}
function raindropIE() {
for (i = 0; i < no; ++ i) {
updateRain();
if ((x[i] <= 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
document.all["dot"+i].style.pixelTop = y[i];
document.all["dot"+i].style.pixelLeft = x[i];
}
setTimeout("raindropIE()", speed);
}
if (ns4up) {
raindropNS();
}
else
if (ie4up) {
raindropIE();
}

-->
</script>
<center>
<table>
<tr><td align=center>这雨下得真大呀！</td></tr>
</table>
</center>
<SCRIPT LANGUAGE="JavaScript">
<!-- hide
function goHist(a) 
{
   history.go(a);
}

//-->
</script>
<SCRIPT language=VBScript>
dim c,numgc
c=-100000
numgc=document.body.sourceIndex
sub SF
c=c+2
Document.all(numgc).style.BackgroundPosition="0 "&c
id=SetTimeOut("SF",64,"VBScript")
end sub
SF
</SCRIPT>
</body>
</html>

所属频道：页面背景特效/更新时间：2012-12-19

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