js判断浏览器的代码

<SCRIPT?language="JavaScript">
<!--
function?browserSniffer(netscape4URL,explorer4URL,webtvURL,
aolURL,operaURL,version3URL,w3cURL)?{
var?agt=navigator.userAgent.toLowerCase();
var?agt=navigator.userAgent.toLowerCase();
var?is_major?=?parseInt(navigator.appVersion);
var?is_minor?=?parseFloat(navigator.appVersion);
var?is_nav?=?((agt.indexOf('mozilla')!=-1)?&&?(agt.indexOf('spoofer')==-1)
&&?(agt.indexOf('compatible')?==?-1)?&&?(agt.indexOf('opera')==-1)
&&?(agt.indexOf('webtv')==-1));
var?is_nav2?=?(is_nav?&&?(is_major?==?2));
var?is_nav3?=?(is_nav?&&?(is_major?==?3));
var?is_nav4?=?(is_nav?&&?(is_major?==?4));
var?is_nav4up?=?(is_nav?&&?(is_major?>=?4));
var?is_navonly?=?(is_nav?&&?((agt.indexOf(";nav")?!=?-1)?||
(agt.indexOf(";?nav")?!=?-1))?);
var?is_nav5?=?(is_nav?&&?(is_major?==?5));
var?is_nav5up?=?(is_nav?&&?(is_major?>=?5));
var?is_ie?=?(agt.indexOf("msie")?!=?-1);
var?is_ie3?=?(is_ie?&&?(is_major?<?4));
var?is_ie4?=?(is_ie?&&?(is_major?==?4)?&&?(agt.indexOf("msie?5.0")==-1)?);
var?is_ie4up?=?(is_ie?&&?(is_major?>=?4));
var?is_ie5?=?(is_ie?&&?(is_major?==?4)?&&?(agt.indexOf("msie?5.0")!=-1)?);
var?is_ie5up?=?(is_ie?&&?!is_ie3?&&?!is_ie4);
var?is_aol?=?(agt.indexOf("aol")?!=?-1);
var?is_aol3?=?(is_aol?&&?is_ie3);
var?is_aol4?=?(is_aol?&&?is_ie4);
var?is_opera?=?(agt.indexOf("opera")?!=?-1);
var?is_webtv?=?(agt.indexOf("webtv")?!=?-1);
if?(is_nav4up)?{
location.href?=?netscape4URL;?//?netscape?4+?but?not?NS5
}else?if?(is_ie4up)?{?//IE4?&?IE5?but?returns?IE4
location.href?=?explorer4URL;
}else?if?(is_webtv)?{?//?Web?TV
location.href?=?webtvURL;
}else?if?(is_aol?||?is_aol3?||?is_aol4)?{?//AOL
location.href?=?aolURL;
}else?if?(is_opera)?{?//?Opera
location.href?=?operaURL;
}else?if?(is_ie3||is_nav3)?{?//?3.0?version?browsers
location.href?=?version3URL;
}else?if?(is_nav5up)?{?//?Netscape?5
location.href?=?w3cURL;
}
}
//-->
</SCRIPT>
<BODY?>
?

原文链接:https://js.aizhan.com/develop/JavaScript/5197.html
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