这个特效怎么实现的呢？

hblzg 2003-12-22 09:15:18

当进入首页的时候，像拉幕一样下拉一个全屏或者半屏的广告。几秒后向上收缩，消失。怎么完成呢？

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苦瓜不甜 2003-12-22

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看了一下SINA.COM首页的类似页面,稍稍改动如下,
下面代码放于<body>之后
<div align="center"><table width=760 border=0 cellspacing=0 cellpadding=0><tr><td align=center>
<script language="JavaScript">

if (document.all) {
// this is a 4.x browser, no?
document.write('<SCRI' + 'PT LANGUAGE="javascript1.2"');
document.writeln(' SRC="/photos/adv4.js"></SCR' + 'IPT>'); 
}
// -->
</script>
<DIV ID="hiddenLayer" style="display: none; height: 450px;">
<script language="Javascript">

</script>
</div>
</td></tr></table></div>
----------------------------------------------------------------------------------
下面是JS脚本文件(adv4.js)
var ads_agt=navigator.userAgent.toLowerCase();
var ads_is_major = parseInt(navigator.appVersion);

var ads_is_ie = ((ads_agt.indexOf("msie") != -1) && (ads_agt.indexOf("opera") == -1) && (ads_agt.indexOf("omniweb") == -1));
var ads_is_ie3 = (ads_is_ie && (ads_is_major < 4));
var ads_is_ie4 = (ads_is_ie && (ads_is_major == 4) && (ads_agt.indexOf("msie 5")==-1) && (ads_agt.indexOf("msie 6")==-1));
var ads_is_ie4up = (ads_is_ie && (ads_is_major >= 4));
var ads_is_ie5 = (ads_is_ie && (ads_is_major == 4) && (ads_agt.indexOf("msie 5.0")!=-1) );
var ads_is_ie5up = (ads_is_ie && !ads_is_ie3 && !ads_is_ie4);
var ads_is_ie5_1_macbeta = (ads_is_ie && (ads_agt.indexOf("mac")!=-1) && (ads_agt.indexOf("5.1b")!=-1));

var ads_is_nav = ((ads_agt.indexOf('mozilla')!=-1) && (ads_agt.indexOf('spoofer')==-1)
&& (ads_agt.indexOf('compatible') == -1) && (ads_agt.indexOf('opera')==-1)
&& (ads_agt.indexOf('webtv')==-1));
var ads_is_nav6 = (ads_is_nav && (ads_agt.indexOf("netscape6")!=-1) && (ads_agt.indexOf("6.1")==-1));
var ads_is_nav6up = (ads_is_nav && !ads_is_nav4 && !ads_is_nav3 && !ads_is_nav2);
var ads_is_nav6_1 = (ads_is_nav && (ads_agt.indexOf("netscape6")!=-1) && (ads_agt.indexOf("6.1")!=-1));
var ads_is_nav6_1up = (ads_is_nav && !ads_is_nav6 && !ads_is_nav4 && !ads_is_nav3 && !ads_is_nav2);

getsGlu = ((ads_is_ie5up && !ads_is_ie5_1_macbeta) || ads_is_nav6_1up);

//function changediv(depth)
//{
// divAll.style.zIndex=depth
// }
function changediv()
{
document.getElementById('hiddenLayer').style.display = "block";
document.getElementById('interstitialFrame').src = adInterPath;
setTimeout("hidediv()",5000)
}
function hidediv()
{
document.getElementById('hiddenLayer').style.display="none";
SYtag=2;
}
function showfull()
{
setTimeout("changediv()",2000);
}
showfull()

lovedogdog 2003-12-22