Use js to determine whether your browser is IE6 of XP SP2

Due to the Windows XP patch SP2, the security of IE6 has also been improved a lot, so there are a lot of features we can use, it will become very strange or even take a rest :(. In particular, pop-up windows, modal windows, and Popup windows are greatly affected. So can I determine whether the Internet Explorer 6 is Internet Explorer 6 (IE6sp1) or Internet Explorer 6 + xp sp2?

The following are two typical UserAgent fields in the IE 6 Browser:

1. Windows XP + SP1 (NT 5.1)
Connection: Keep-Alive
Accept :*/*
Accept-Encoding: gzip, deflate
Accept-Language: zh-cn
Host: zhilee.aehk.com
Referer: http://www.cnblogs.com/birdshome/archive/2005/03/11/113723.html
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;. net clr 1.1.4322)
2. Windows 2003 + SP1 (NT 5.2)
Connection: Keep-Alive
Accept :*/*
Accept-Encoding: gzip, deflate
Accept-Language: zh-cn
Host: zhilee.aehk.com
Referer: http://www.cnblogs.com/bluefee/archive/2005/03/28/127455.html
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1;. net clr 1.1.4322)
UA-CPU: x86
The biggest difference between the two UA strings and the ordinary UA string is that there is a "SV1" sign in it. What does this mean? SV1 is intended to be "Security Version 1", which is used to indicate whether the operating system used by users using the IE 6 browser is XP SP2 or WS03SP1.

Since XP SP2 and WS03SP1 have an impact on IE6, why not upgrade the IE version, but use SVX annotation separately? The IE Development Team explained this by saying that although the patches of these two operating systems have an impact on the settings of IE6, they did not modify any features of IE6, such as rendering, DHTML, and DOM. Therefore, some such security settings are not suitable for upgrading the version number of IE itself.

In subsequent IE versions, the SVX flag may be removed, so currently we use UA string to detect the SP version of the operating system, which is only a temporary method.

Var ua = navigator. userAgent;
If (ua. indexOf ("SV1 ")! =-1)
{
If (ua. indexOf ("NT 5.1 ")! =-1)
{
// Windows xp + sp2
}
Else if (ua. indexOf ("NT 5.2 ")! =-1)
{
// Windows 2003 + sp1
}
Else
{
// Wrong user agent string
}
}