常用的检测浏览器的javascript代码
看过Professional.JavaScript.For.Web.Developers这本书的读者应该都觉得这本书讲的很多东西都很实用,很不错。 下面的代码就是书中的一个章节的代码,关于浏览器的检测。
var sUserAgent = navigator.userAgent;
var fAppVersion = parseFloat(navigator.appVersion);
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function compareVersions(sVersion1, sVersion2) {
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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;
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}
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var isOpera = sUserAgent.indexOf("Opera") > -1;
var isMinOpera4 = isMinOpera5 = isMinOpera6 = isMinOpera7 = isMinOpera7_5 = false;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
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"]);
}
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isMinOpera4 = fOperaVersion >= 4;
isMinOpera5 = fOperaVersion >= 5;
isMinOpera6 = fOperaVersion >= 6;
isMinOpera7 = fOperaVersion >= 7;
isMinOpera7_5 = fOperaVersion >= 7.5;
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
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;
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if (isKHTML) {
isSafari = sUserAgent.indexOf("AppleWebKit") > -1;
isKonq = sUserAgent.indexOf("Konqueror") > -1;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
if (isSafari) {
var reAppleWebKit = new RegExp("AppleWebKit\/(\d+(?:\.\d*)?)");
reAppleWebKit.test(sUserAgent);
var fAppleWebKitVersion = parseFloat(RegExp["$1"]);
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isMinSafari1 = fAppleWebKitVersion >= 85;
isMinSafari1_2 = fAppleWebKitVersion >= 124;
} else if (isKonq) {
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
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;
}
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isIE = sUserAgent.indexOf("compatible") > -1
&& sUserAgent.indexOf("MSIE") > -1
&& !isOpera;
var isMinIE4 = isMinIE5 = isMinIE5_5 = isMinIE6 = false;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
if (isIE) {
var reIE = new RegExp("MSIE (\d+\.\d+);");
reIE.test(sUserAgent);
var fIEVersion = parseFloat(RegExp["$1"]);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
isMinIE4 = fIEVersion >= 4;
isMinIE5 = fIEVersion >= 5;
isMinIE5_5 = fIEVersion >= 5.5;
isMinIE6 = fIEVersion >= 6.0;
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isMoz = sUserAgent.indexOf("Gecko") > -1
&& !isKHTML;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isMinMoz1 = sMinMoz1_4 = isMinMoz1_5 = false;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
if (isMoz) {
var reMoz = new RegExp("rv:(\d+\.\d+(?:\.\d+)?)");
reMoz.test(sUserAgent);
isMinMoz1 = compareVersions(RegExp["$1"], "1.0") >= 0;
isMinMoz1_4 = compareVersions(RegExp["$1"], "1.4") >= 0;
isMinMoz1_5 = compareVersions(RegExp["$1"], "1.5") >= 0;
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isNS4 = !isIE && !isOpera && !isMoz && !isKHTML
&& (sUserAgent.indexOf("Mozilla") == 0)
&& (navigator.appName == "Netscape")
&& (fAppVersion >= 4.0 && fAppVersion < 5.0);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isMinNS4 = isMinNS4_5 = isMinNS4_7 = isMinNS4_8 = false;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
if (isNS4) {
isMinNS4 = true;
isMinNS4_5 = fAppVersion >= 4.5;
isMinNS4_7 = fAppVersion >= 4.7;
isMinNS4_8 = fAppVersion >= 4.8;
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");
var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC")
|| (navigator.platform == "Macintosh");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isUnix = (navigator.platform == "X11") && !isWin && !isMac;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
var isWin95 = isWin98 = isWinNT4 = isWin2K = isWinME = isWinXP = false;
var isMac68K = isMacPPC = false;
var isSunOS = isMinSunOS4 = isMinSunOS5 = isMinSunOS5_5 = false;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
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 9x 4.90") > -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);
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
if (isMac) {
isMac68K = sUserAgent.indexOf("Mac_68000") > -1
|| sUserAgent.indexOf("68K") > -1;
isMacPPC = sUserAgent.indexOf("Mac_PowerPC") > -1
|| sUserAgent.indexOf("PPC") > -1;
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
if (isUnix) {
isSunOS = sUserAgent.indexOf("SunOS") > -1;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
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;
}
}
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