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JavaScript checks the scripts of browsers and Operating Systems

Source: Internet
Author: User
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In Web programming, it is very important to identify users' browsers and operating systems. Because they have different levels of support for HTML and JavaScript.
It is generally applied on the system login page or homepage.
The specific application is as follows:
Copy codeThe Code is as follows:
<Html>
<Head>
<Title> Login </title>
<Script type = "text/javascript" src = "detect. js"> </script>
<Script type = "text/javascript">
Window. onload = function (){
If (isMinIE5_5 & isWin) | (ismin1_1 & isUnix)
| (IsMinSafari1 & isMac )){
Document. getElementById ("divLogin"). style. visibility = "visible ";
Document. getElementById ("divError"). style. visibility = "hidden"
}
};
</Script>
</Head>
<Body>
<Form method = "post" action = "DoLogin. jsp">
<Div style = "border: 2px dashed blue; background-color: # dedede; height: 300px; padding: 10px">
<Div id = "divError" style = "position: absolute; left: 20px; top: 100px;">
This Web application requires one of the following:
<Ul>
<Li> Internet Explorer 5.5 or higher for Windows </li>
<Li> Mozilla 1.0 or higher for Unix </li>
<Li> Safari 1.0 or higher for Macintosh </li>
</Ul>
<Noscript>
<P> This Web application also requires JavaScript (if you are using one of the above browsers, make sure that JavaScript is enabled). </p>
</Noscript>
</Div>
<Div id = "divLogin" style = "position: absolute; left: 20px; top: 100px; visibility: hidden">
<Table border = "0" width = "100%" height = "100%"> <tr> <td align = "center">
<Table border = "0">
<Tr>
<Td> Username: </td> <input type = "text" name = "txtUsername"/> </td>
</Tr>
<Tr>
<Td> Password: </td> <input type = "password" name = "txtPassword"/> </td>
</Tr>
<Tr>
<Td> </td> <input type = "Submit" value = "Login"/> </td>
</Tr>
</Table>
</Td> </tr> </table>
</Div>
</Div>
</Form>
</Body>
</Html>

Detect. js
Copy codeThe Code is as follows:
/*************************************** **********************************
File Name: detect. js
Create Date:
Author:
Description: detect browser and operating system
**************************************** *******************************/
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;
}
}

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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