星空背景，就像是遨游在宇宙中一样

作者：佚名来源：不详发布时间：2006-10-29 0:17:57 发布人：admin

要完成此效果需要两个步骤

第一步：把如下代码加入到<head>区域中

isibility:visible;
top:-50px;
width:50px;
height:50px;
font-size:1px;
background-color:white;
}
.

60pt{font-size:60pt;color:#ff66cc;font-family:汉鼎繁淡古}
</style>
<Script LANGUAGE="JavaScript">
<--
var starnum = 75; // 星星的数目
var isNS =

(document.layers);
var _all = (isNS)? '' : 'all.';
var _style = (isNS) ? '' : '.style';
var

xoffset, yoffset, w_x, w_y, tmpx, tmpy, scrlx, scrly;
function getstartpos(obj) {  //定义星星移动

的起始位置
obj.deltay = Math.floor(Math.random() * 12);    //用随机函数决定
obj.deltax =

Math.floor(Math.random() * 12);
obj.xdir = (Math.floor(Math.random() * 2) == 1) ? '+' : '-';
o

bj.ydir = (Math.floor(Math.random() * 2) == 1) ? '+' : '-';
obj.counter = 1;
if (isNS) {
o

bj.clip.width = 1;
obj.clip.height = 1;
obj.moveTo(xoffset+pageXOffset, yoffset+pageYOffset);
}

else {
obj.width = 1;
obj.height = 1; 
obj.pixelTop = yoffset+document.body.scrollTop;
o

bj.pixelLeft = xoffset+document.body.scrollLeft;
   }
}
function movestar(starN)   //移动星星的位

置
{
tmpx = starN.deltax*starN.counter+starN.counter;
tmpy =

starN.deltay*starN.counter+starN.counter;
if (isNS) {
starN.clip.width = starN.counter / 3;
s

tarN.clip.height = starN.counter / 3;
scrlx = pageXOffset;
scrly = pageYOffset;
if

((starN.left+tmpx >= w_x+scrlx) || (starN.top+tmpy >= w_y+scrly) || (starN.left-tmpx <= scrlx) ||

(starN.top-tmpy <= scrly)) {
getstartpos(starN);
} else {
eval('starN.moveBy('+starN.xdir+tmpx+',

'+starN.ydir+tmpy+')');
   }
} else {
starN.width = starN.counter/3;
starN.height =

starN.counter/3;
scrlx = document.body.scrollLeft;
scrly = document.body.scrollTop;
if

((starN.pixelLeft+tmpx >= w_x+scrlx)||(starN.pixelTop+tmpy >= w_y+scrly) || (starN.pixelLeft-tmpx

<= scrlx)||(starN.pixelTop-tmpy <= scrly)) {
getstartpos(starN);
} else {
e

val('starN.pixelTop'+starN.ydir+'=tmpy');
eval('starN.pixelLeft'+starN.xdir+'=tmpx');
   }
}
s

tarN.counter++;
}
function animate() //让所有的星星动起来
{
for(i=1; i <= starnum; i++) {
m

ovestar(eval('star'+i));
}
setTimeout('animate()', 100);
}

function findwindowparams() {  //定义

星星移动的起始位置
w_x = (isNS) ? window.innerWidth : document.body.clientWidth;
w_y = (isNS) ?

window.innerHeight : document.body.clientHeight;
xoffset = w_x / 2;
yoffset = w_y / 2;
for (i =

1; i <= starnum; i++) {
getstartpos(eval('star'+i));
   }
}
function resizeNS() {
s

etTimeout('document.location.reload()', 400);
}
(isNS) ? window.onresize = resizeNS :

window.onresize = findwindowparams;
window.onload = new Function("findwindowparams();

animate();");
-->
</Script>

第二步：把如下代码加入到<body>区域中

<Script LANGUAGE="JavaScript">
<--
for (i = 1; i <= starnum; i++) { //给星星定义层
d

ocument.writeln('<div id="star'+i+'" class="star"></div>');
eval('var

star'+i+'=document.'+_all+'star'+i+_style);
}
-->
</Script>

特别说明：如网页特效代码中有引用图片文件等，请自己下载到本地调试！

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