爱华网
userAgent 属性是一个只读的字符串，声明了浏览器用于 HTTP 请求的用户代理头的值。一般来讲，它是在 navigator.appCodeName 的值之后加上斜线和 navigator.appVersion 的值构成的。例如：Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322)。注：用户代理头：user-agent header。
useragent_useragent -基本介绍
Some commonuser agent strings dissectedThis list is incomplete; you can help by expanding it.
[edit]Internet Explorer, and browsers cloaking as Internet Explorer
Mozilla/MozVer (compatible; MSIE IEVer[; Provider]; Platform[; Extension]*) [Addition]
useragent_useragent -主要内容
Where:*MozVer: Netscape compatibilityversion
o 1.22: Internet Explorer 1.5 and 2.0
o 2.0:Internet Explorer 3.x for Windows and Internet Explorer 2.1 for Mac
o 3.0: Internet Explorer 3.x for Mac
o 4.0:Internet Explorer 4.x and higher
* IEVer: Internet Explorer version number, e.g.: 1.5, 3.01, 5.0b1, 6.0
*Provider: Access provider, e.g.:
o AOL Version
o America Online Browser Version; revRevision: AOL Explorer (note, this breaks the rule of nosemicolons in Provider values)
o CS 2000
o MSN Version
o This parameter is included but empty on some Opera distributions, resulting in "semicolon space semicolon":
; ;
*Platform: Operating system, e.g.:
o Windows 3.1 (including Windows NT 3.x)
o Windows 95
o Windows 98
o Windows 98; Win 9x 4.90: Windows Millennium Edition (Windows Me)
o Windows NT
o Windows NT 4.0
o Windows NT 5.0: Windows 2000
o Windows 2000: Windows 2000 (used by Opera)
o Windows NT 5.01: Windows 2000, Service Pack 1 (SP1)
o Windows NT 5.1: Windows XP
o Windows NT 5.2: Windows Server 2003
o Windows NT 6.0: Windows Vista
o Windows CE: Windows CE and Windows Mobile (used by Internet Explorer Mobile)
o Win32: Seen with IE 7b1 on Windows XP
o Mac_68000
o Mac_PPC: Used up until IE 4.x
oMac_PowerPC: Used from IE 5.x and up o SunOS Version: SunOS
o Symbian OS: Used by Opera on mobile phones
o Nitro: Nintendo DS (used by Opera)
* Extension: optional, a list of semicolon-separated extensions installed, e.g.:
o .NET CLR Version: .NET Framework common language runtime installed (may appear multiple times, e.g. when both 1.1 and 2.0 are supported)
o SV1: Internet Explorer 6 in Windows XP SP2 and Windows Server 2003 SP1 installed
o Tablet PC Version: Tablet services are installed
o Win64: 64-bit Windows
o IA64: Intel Itanium processor
o AMD64: x64 processor
o x64: x64 processor
o WOW64: 32-bit Internet Explorer is running on 64-bit Windows
o Media Center PC Version: Windows MCE, where Version is:
+ 2.8: Media Center 2004
+ 3.0: Media Center 2005
+ 3.1: Media Center 2005 with update rollup 1
+ 4.0: Media Center 2005 with update rollup 2
+ 5.0: Windows Vista Home Premium or Ultimate edition.
oMediaCenter Version:browsing from within Media Center interface
o MSIECrawler: MSIE retrieving pages for Offline Content feature
o X11: Internet Explorer on SunOS
o PPC: Pocket PC (used by Internet Explorer Mobile)
o Smartphone: Smartphone (used by Internet Explorer Mobile)
o Motorola Type: Internet Explorer Mobile on Motorola mobile phone
o Nokia Type/Version: Opera on Nokia mobile phone
o Various 3rd party browser extensions, like: (R1 Version) (RealPlayer webbrowser), Alexa Toolbar, Maxthon, Crazy Browser Version, MyIE2,Avant Browser[avantbrowser.com], FDM
o Language: some Opera versions seem to include the language code here (seen for Opera 8.5 on Windows XP)
o WidthxHeight: some Internet Explorer Mobile browsers include the display resolution here
* Addition
o Netscape/Version: Netscape usingMSHTMLrendering engine
o Opera Version [Language]: Opera cloaked as Internet Explorer
Example:
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
[edit] Internet Explorer 1.0
Internet Explorer 1.0 used an alternative user agent:
Microsoft Internet Explorer/Version (Platform)
Where:
* Version: Windows version because IE was originally supposed to be included with Windows 95, e.g.: 4.0b1 for Internet Explorer 1.0 beta
* Platform: operating system, e.g.: Windows 95
[edit] Netscape
This only applies to earlier versions of Netscape. Netscape 6.0 or higher based on the Gecko engine should see the Mozilla section below
Mozilla/Version[Gold] [[Language]][Provider] (Platform; Security[; SubPlatform][StandAlone])
Where:
* Version: version number
* Gold: includes HTML editor
* Language: standardized two-letter language identifier, e.g.: en, fr, es (Netscape 2.x and 3.x: only for non-English versions, Netscape 4.x: not on Macintosh platforms?)
* Provider, may contain variants of C-CCK-MCD (Client Customization Kit and Mission Control Desktop, for ISPs and OEMs)
* Platform
o Win16: Windows 3.x
o Win95: Windows 95, where SubPlatform can be:
+ 16bit for 16-bit version of Netscape
o Win98: Windows 98
o WinNT: Windows NT 3.x
o Windows NT 5.0: Windows 2000
o Windows NT 5.1: Windows XP
o X11, where SubPlatform is:
+ Distribution Version [Subversion], e.g.: Linux i586, SunOS 5.6 sun4u, IRIX 6.5 IP32
o Macintosh, where SubPlatform is:
+ 68K
+ PPC
+ Intel
* Security
o U: strong security (USA)
o I: weak security (International)
o N: no security
* StandAlone: standalone Navigator is indicated by ; Nav (X11 platforms), ;Nav (Windows, note missing space) or , Nav (on Macintosh), only for version 4.x
[edit] Mozilla
Mozilla/MozVer (Platform; Security; SubPlatform; Language; rv:Revision[; Extension]*) Gecko/GeckVer [Product/ProdVer]
Where:
* MozVer: Netscape compatibility version
o 5.0 for all known Mozilla browsers
* Platform and SubPlatform
o Windows
+ Win3.11:Windows 3.11
+ Win95: Windows 95
+ Win98: Windows 98
+ Win 9x 4.90: Windows Me
+ WinNT3.51:Windows NT 3.51
+ WinNT4.0: Windows NT 4.0
+ Windows NT 5.0: Windows 2000
+ Windows NT 5.1: Windows XP (except XP Professional x64 Edition)
+ Windows NT 5.2: Windows Server 2003 andWindows XP Professional x64 Edition
+ Windows NT 6.0: Windows Vista
+ Windows CE 4.21: Windows Mobile 2003
o Macintosh
+ PPC Mac OS X
+ PPC Mac OS X Mach-O
+ Intel Mac OS X
o X11
+ Linux [Version] Hardware
+ FreeBSD Hardware
+ NetBSD Hardware
+ SunOS Hardware
* Security
o U: strong security (USA)
o I: weak security (International)
o N: no security
* Language: standardized language identifier, e.g.: en, en-US, en-GB
* Revision: e.g. m18, 1.0rc3, 1.7.8, 1.8a2
* Extension
o MultiZilla Version
* GeckVer: Gecko (layout engine) compilation date, in the format YYYYMMDD
* Product
o For the Mozilla Application Suite, there is no Product or ProdVer. The Revision is the product version.
o Netscape, Netscape6
o Phoenix, Firebird, Firefox, GranParadiso (Firefox 3 codename),minefield(trunk build)
o K-Meleon
o Minimo
o SeaMonkey
o Camino
o CS 2000 7.0
* ProdVer: Product version
[edit] Encryption strength "U" / "I" / "N"
Netscape, Mozilla, Opera and some others use one of these three letters to specify the browser's encryption strength. Since the US government formerly wouldn't allow encryption higher than 40-bit to be exported from the USA, different versions were released with different encryption strengths. "U" stands for "USA" (for the version with 128-bit encryption), "I" stands for "International" (the browser has 40-bit encryption and can be used anywhere in the world), "N" stands for "None" (no encryption). Originally the "U" version was allowed for download only from the USA, but since then the US government has loosened its policy and exporting high encryption is now permitted to most countries (see Export of cryptography for more information). Now Netscape and Mozilla distribute their browsers only in a "U" version, supporting up to 256-bit encryption, since an international version is no longer required.
