来研究一下yahoo的酷图幻灯js代码

核心提示：http://cn.sports.yahoo.com/040109/262/1ypby.Htmljs代码如下：var PUisIE_NAV4 = false;if (parseFloat(navigator.appVersion) >= 4) {PUisIE_NAV4 = true;}var PUwinWidth

　　http://cn.sports.yahoo.com/040109/262/1ypby.Html
js代码如下：

var PUisIE_NAV4 = false;
if (parseFloat(navigator.appVersion) >= 4) {
PUisIE_NAV4 = true;
}

var PUwinWidth='740';
var PUwinHeight='320';

var PUtimes = 1; /* number of times to show ad. if > times, then redirect thru */
//var PUtheDomain = ".cn.yahoo.com";
var PUtheDomain = document.domain;
var PUeXPiresIn = 4/24; /* days between shows of the ad */

function errorsupPRessor(){
return true
}
window.onerror=errorsuppressor;

function PUsetCook(t,expIn) {
var cook;
var PUexDate;
PUexDate = new Date;
PUexDate.setTime(PUexDate.getTime() + expIn*24*60*60*1000);
cook = "PU=t="+t+"; expires=" + PUexDate.toGMTString() +"; domain="+PUtheDomain + "; path=/";
document.cookie = cook;
}

var PU_NO_COOKIES = 9999;

function PUgetCook(x) {
var i,j,a,b,s,e,d,f;
a = document.cookie;
if (a == "") return PU_NO_COOKIES;
s = a.indexOf(x + "=");
if (s == -1) return false;
s += x.length+1;
e = a.indexOf(';',s);
if (e == -1) e = a.length;
return a.substring(s,e);

}

/* check cookies - if cookies are off or if user saw it X times, then we redirect thru */

var PUd;
var PUb=PUgetCook("PU");
var PUoverTimes = 0;

if (PUb == PU_NO_COOKIES) {
PUoverTimes = 1;
} else {
if (PUb != false) {
PUb = PUb.split('&');
for (PUi=0; PUi<PUb.length; PUi++) {
PUd = PUb[PUi].split('=');
if (PUd == "t") {
last;
}
}
PUd[1]++;
if (PUd[1] > PUtimes) {
PUoverTimes = 1;
} else {
PUsetCook(PUd[1],PUexpiresIn);
}
} else {
PUsetCook(1,PUexpiresIn);
}
}

function PUlaunchPU(){
var PUwin;
var addIt = PUisIE_NAV4 ? ',top=5000,left=5000' : '';
PUwin=window.open('about:blank','PUwin', 'width='+PUwinWidth+',height='+PUwinHeight+',location=no,menubar=no,titlebar=no,status=no,toolbar=no,scrollbars=yes,resizable=no'+addIt,true);
PUwin.blur();
return PUwin;
}

//if ((PUoverTimes < 1)&&(navigator.userAgent.indexOf("Unix")==-1)) {
document.write('<script src="http://cn.adserver.yahoo.com/a?f='+PUpage+'&p='+PUprop+'&l=PUC&c=o&bg=ffffff" language=javascript></');

document.write('script>');
//}