JavaScript advanced programming Reading Notes (16) javascript detection browser and operating system-detect. js

Browser Detection Method

1. Object Feature Detection: a common method for determining browser capabilities. This method can be used if you are more concerned with the browser's capabilities and do not care about its actual identity. The common native Ajax write method uses this method to create XMLHttpRequest:
Copy codeThe Code is as follows:
IXHR: function (){
If (window. ActiveXObject ){
XHR = new ActiveXObject ('Microsoft. xmlhttp ');
} Else if (window. XMLHttpRequest ){
XHR = new XMLHttpRequest ();
} Else {
Return null;
}
}

2. user-agent string detection method: You can use the user-agent string in the browser to parse and determine the method in detect. js below.

Detection platform/Operating System

Use the navigator to fold the platform attribute and the user-agent string to determine the method in detect. js below.

Detect browsers and operating systems-detect. js
Copy codeThe Code is as follows:
Var sUserAgent = navigator. userAgent;
Var fAppVersion = parseFloat (navigator. appVersion );

Function compareVersions (sVersion1, sVersion2 ){
Var aVersion1 = sVersion1.split (".");
Var aVersion2 = sVersion2.split (".");

If (aVersion1.length> aVersion2.length ){
For (var I = 0; I <aVersion1.length-aVersion2.length; I ++ ){
AVersion2.push ("0 ");
}
} Else if (aVersion1.length <aVersion2.length ){
For (var I = 0; I <aVersion2.length-aVersion1.length; I ++ ){
AVersion1.push ("0 ");
}
}

For (var I = 0; I <aVersion1.length; I ++ ){

If (aVersion1 [I] <aVersion2 [I]) {
Return-1;
} Else if (aVersion1 [I]> aVersion2 [I]) {
Return 1;
}
}

Return 0;
}
Var isOpera = sUserAgent. indexOf ("Opera")>-1;
Var isMinOpera4 = isMinOpera5 = isMinOpera6 = isMinOpera7 = isMinOpera7_5 = false;
If (isOpera ){
Var fOperaVersion;
If (navigator. appName = "Opera "){
FOperaVersion = fAppVersion;
} Else {
Var reOperaVersion = new RegExp ("Opera (// d + //. // d + )");
ReOperaVersion. test (sUserAgent );
FOperaVersion = parseFloat (RegExp ["$1"]);
}
IsMinOpera4 = fOperaVersion> = 4;
IsMinOpera5 = fOperaVersion> = 5;
IsMinOpera6 = fOperaVersion> = 6;
IsMinOpera7 = fOperaVersion> = 7;
IsMinOpera7_5 = fOperaVersion> = 7.5;
}
Var isKHTML = sUserAgent. indexOf ("KHTML")>-1
| SUserAgent. indexOf ("Konqueror")>-1
| SUserAgent. indexOf ("AppleWebKit")>-1;

Var isMinSafari1 = isMinSafari1_2 = false;
Var isMinKonq2_2 = isMinKonq3 = isMinKonq3_1 = isMinKonq3_2 = false;
If (isKHTML ){
IsSafari = sUserAgent. indexOf ("AppleWebKit")>-1;
IsKonq = sUserAgent. indexOf ("Konqueror")>-1;
If (isSafari ){
Var reAppleWebKit = new RegExp ("AppleWebKit /// (// d + (? : //. // D *)?) ");
ReAppleWebKit. test (sUserAgent );
Var fAppleWebKitVersion = parseFloat (RegExp ["$1"]);
IsMinSafari1 = fAppleWebKitVersion> = 85;
IsMinSafari1_2 = fAppleWebKitVersion> = 124;
} Else if (isKonq ){
Var reKonq = new RegExp ("Konqueror // (// d + (? : //. // D + (? : //. // D )?)?) ");
ReKonq. test (sUserAgent );
IsMinKonq2_2 = compareVersions (RegExp ["$1"], "2.2")> = 0;
IsMinKonq3 = compareVersions (RegExp ["$1"], "3.0")> = 0;
IsMinKonq3_1 = compareVersions (RegExp ["$1"], "3.1")> = 0;
IsMinKonq3_2 = compareVersions (RegExp ["$1"], "3.2")> = 0;
}

}
Var isIE = sUserAgent. indexOf ("compatible")>-1
& SUserAgent. indexOf ("MSIE")>-1
&&! IsOpera;

Var isMinIE4 = isMinIE5 = isMinIE5_5 = isMinIE6 = false;
If (isIE ){
Var reIE = new RegExp ("MSIE (// d + //. // d + );");
ReIE. test (sUserAgent );
Var fIEVersion = parseFloat (RegExp ["$1"]);
IsMinIE4 = fIEVersion> = 4;
IsMinIE5 = fIEVersion> = 5;
IsMinIE5_5 = fIEVersion> = 5.5;
IsMinIE6 = fIEVersion> = 6.0;
}
Var isMoz = sUserAgent. indexOf ("Gecko")>-1
&&! IsKHTML;
Var ismin1_1 = smin1_1_4 = ismin1_1_5 = false;
If (isMoz ){
Var reMoz = new RegExp ("rv :( // d + //. // d + (? : //. // D + )?) ");
ReMoz. test (sUserAgent );
Ismin1_1 = compareVersions (RegExp ["$1"], "1.0")> = 0;
Ismin1_1_4 = compareVersions (RegExp ["$1"], "1.4")> = 0;
Ismin1_1_5 = compareVersions (RegExp ["$1"], "1.5")> = 0;
}
Var isNS4 =! IsIE &&! IsOpera &&! IsMoz &&! IsKHTML
& (SUserAgent. indexOf ("Mozilla") = 0)
& (Navigator. appName = "Netscape ")
& (FAppVersion> = 4.0 & fAppVersion <5.0 );
Var isMinNS4 = isMinNS4_5 = isMinNS4_7 = isMinNS4_8 = false;
If (isNS4 ){
IsMinNS4 = true;
IsMinNS4_5 = fAppVersion & gt; = 4.5;
IsMinNS4_7 = fAppVersion & gt; = 4.7;
IsMinNS4_8 = fAppVersion> = 4.8;
}
Var isWin = (navigator. platform = "Win32") | (navigator. platform = "Windows ");
Var isMac = (navigator. platform = "Mac68K") | (navigator. platform = "MacPPC ")
| (Navigator. platform = "Macintosh ");
Var isUnix = (navigator. platform = "X11 ")&&! IsWin &&! IsMac;
Var isWin95 = isWin98 = isWinNT4 = isWin2K = isWinME = isWinXP = false;
Var isMac68K = isMacPPC = false;
Var isSunOS = isMinSunOS4 = isMinSunOS5 = isMinSunOS5_5 = false;
If (isWin ){
IsWin95 = sUserAgent. indexOf ("Win95")>-1
| SUserAgent. indexOf ("Windows 95")>-1;
IsWin98 = sUserAgent. indexOf ("Win98")>-1
| SUserAgent. indexOf ("Windows 98")>-1;
IsWinME = sUserAgent. indexOf ("Win 9x4.90")>-1
| SUserAgent. indexOf ("Windows ME")>-1;
IsWin2K = sUserAgent. indexOf ("Windows NT 5.0")>-1
| SUserAgent. indexOf ("Windows 2000")>-1;
IsWinXP = sUserAgent. indexOf ("Windows NT 5.1")>-1
| SUserAgent. indexOf ("Windows XP")>-1;
IsWinNT4 = sUserAgent. indexOf ("WinNT")>-1
| SUserAgent. indexOf ("Windows NT")>-1
| SUserAgent. indexOf ("WinNT4.0")>-1
| SUserAgent. indexOf ("Windows NT 4.0")>-1
&&(! IsWinME &&! IsWin2K &&! IsWinXP );
}
If (isMac ){
IsMac68K = sUserAgent. indexOf ("Mac_68000")>-1
| SUserAgent. indexOf ("68 K")>-1;
IsMacPPC = sUserAgent. indexOf ("Mac_PowerPC")>-1
| SUserAgent. indexOf ("PPC")>-1;
}
If (isUnix ){
IsSunOS = sUserAgent. indexOf ("SunOS")>-1;
If (isSunOS ){
Var reSunOS = new RegExp ("SunOS (// d + //. // d + (? : //. // D + )?) ");
ReSunOS. test (sUserAgent );
IsMinSunOS4 = compareVersions (RegExp ["$1"], "4.0")> = 0;
IsMinSunOS5 = compareVersions (RegExp ["$1"], "5.0")> = 0;
IsMinSunOS5_5 = compareVersions (RegExp ["$1"], "5.5")> = 0;
}
}

Author: Artwl