JavaScript gets user Client operating system version _javascript tips

In the afternoon to visit the user site, the feeling that the problem is really strange, and finally found that the computer is win 2000 of the operating system, feel the crux of the problem may be here, the internet Google, found that the original media Player 11 does not support the Win2000 system, Users are required to download the player version for the user's operating system version, so that Win2000 users can download media Player 9.
Well, the problem is found, and solving the problem is a simple matter.
The following is mainly about how to use JavaScript to determine the user's operating system and version.
Key parts:
Window.navigator.userAgent: User browser, operating system and other information, corresponding to the HTML request file header User-agent part.
Code section:
<script language= "JavaScript" >
var ua = window.navigator.userAgent;
var osversion = Ua.split (";") [2];
var OsV = osversion.substr (osversion.length-3,3);
Switch (OsV)
{
Case "5.0":
document.write ("Win2000");
Break
Case "5.1":
document.write ("WinXP");
Break
Case "5.2":
document.write ("Win2003");
Break
Default
document.write ("others");
Break
}
</script>
Note:
Window.navigator.userAgent several values:
1) winxp+ie7:mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; CIBA. NET CLR 2.0.50727;. NET CLR 3.0.4506.2152;. NET CLR 3.5.30729)
2) winxp+ff3.0:mozilla/5.0 (Windows; U Windows NT 5.1; ZH-CN; rv:1.9.0.10) gecko/2009042316 firefox/3.0.10 (. NET CLR 3.5.30729)
3) win2000+ie6:mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
4) win2000+ff3.1:mozilla/5.0 (Windows; U Windows NT 5.0; ZH-CN; RV:1.9.1B2) gecko/20081201 firefox/3.1b2
The above values are for reference only, in order to understand the code, specific values please specific test, do not book as much as the letter, the letter is not as good as the letter they do, hehe