大雁南飞(请注意改变图片）

- 中国WEB开发者网络 (http://www.webasp.net)
-- 网页特效 (http://www.webasp.net/javascript/)
--- 大雁南飞(请注意改变图片） (http://www.webasp.net/javascript/1/266.htm)
-- 发布日期： 2004-07-03
<!-- 网页特效代码由[中国WEB开发者网络:http://www.ChinaWebDev.com]提供！ -->
<!-- 要实现此效果需要 2 个步骤： -->

<!-- 第 1 步： -->
<!-- 把<BODY>中的属性代码改为： -->

<BODY bgcolor=#000000" onLoad="pRe();Animate()">



<!-- 第 2 步： -->
<!-- 把下面的代码加到<BODY></BODY>区域中： -->

<script language="JavaScript">
<!--
amount=7;
function pRe(){
Img0=new Image();
Img0.src="0109bbat1.gif";
Img1=new Image();
Img1.src="0109bbat2.gif";
Img2=new Image();
Img2.src="0109bbat3.gif";
setTimeout('pRe()',3000)
}
brwsr=(document.layers)?1:0;
if (brwsr){
window.captureEvents(Event.MOUSEMOVE);
for (i=0; i < amount; i++)
document.write("<LAYER NAME=n"+i+" LEFT=0 TOP=-50><IMG SRC='0109bbat1.gif' NAME='nsi'></LAYER>");
}
else{
document.write('<div id="ie" style="position:absolute;top:0;left:0"><div style="position:relative">');
for (i=0; i < amount; i++)
{document.write('<img name="msieBats" src="0109bbat1.gif" style="position:absolute;top:-50;left:0">')}
document.write('</div></div>');
}
bats=new Array('0109bbat1.gif','0109bbat2.gif','0109bbat3.gif','0109bbat2.gif')
Xpos=0;
Ypos=-50;
yBase=0;
xBase=0;
step=0.5;
currStep=0;
a_count=0;
b_count=1;
c_count=2;
move=1;
if (brwsr){
function NsMouseFollow(evnt){
Xpos = evnt.pageX;
Ypos = evnt.pageY;
}
window.onMouseMove = NsMouseFollow;
}
else{
function MsieMouseFollow(){
Xpos = event.x;
Ypos = event.y;
}
document.onmousemove = MsieMouseFollow;
}
function Swirl(){
if (!brwsr)ie.style.top=document.body.scrollTop;
yBase=(document.layers)?window.innerHeight/3:window.document.body.offsetHeight/3;
xBase=(document.layers)?window.innerWidth/7:window.document.body.offsetWidth/7;
for (i=0; i < amount; i++){
var layer=(document.layers)?document.layers["n"+i]:msieBats[i].style;
layer.top = Ypos+yBase*Math.sin(((currStep)+i*3.7)/4)*Math.cos((currStep+i*35)/20)
layer.left =Xpos+xBase*Math.cos(((currStep)+i*3.7)/4)*Math.cos((currStep+i*35)/62)
}
currStep+=step;
}
function Animate(){
if (a_count == bats.length) a_count=0;
if (b_count == bats.length) b_count=0;
if (c_count == bats.length) c_count=0;
if (brwsr){
document.layers['n'+0].document.images['nsi'].src=bats[a_count];
document.layers['n'+1].document.images['nsi'].src=bats[b_count];
document.layers['n'+2].document.images['nsi'].src=bats[c_count];
}
else{
msieBats[0].src=bats[a_count];
msieBats[1].src=bats[b_count];
msieBats[2].src=bats[c_count];
}
if (amount > 2)
{
for (i=3; i < amount; i++)
{
if (brwsr)
document.layers['n'+i].document.images['nsi'].src=bats[b_count];
else
msieBats[i].src=bats[b_count];
}
}
a_count+=move;
b_count+=move;
c_count+=move;
Swirl();
setTimeout('Animate()',30)
}
//-->
</script>


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