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View Full Version : what is this javascript meaning??


houserabbit
07-17-2009, 08:28 AM
what is this javascript meaning??


// Browser Detect Lite v2.1
// http://www.dithered.com/javascript/browser_detect/index.html
// modified by Chris Nott (chris@NOSPAMdithered.com - remove NOSPAM)
//
// modified by Michael Lovitt to include OmniWeb and Dreamcast
function BrowserDetectLite() {
var ua = navigator.userAgent.toLowerCase();
this.ua = ua;
// browser name
this.isGecko = (ua.indexOf('gecko') != -1);
this.isMozilla = (this.isGecko && ua.indexOf("gecko/") + 14 == ua.length);
this.isNS = ( (this.isGecko) ? (ua.indexOf('netscape') != -1) : ( (ua.indexOf('mozilla') != -1) && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('opera') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1) ) );
this.isIE = ( (ua.indexOf("msie") != -1) && (ua.indexOf("opera") == -1) && (ua.indexOf("webtv") == -1) );
this.isOpera = (ua.indexOf("opera") != -1);
this.isKonqueror = (ua.indexOf("konqueror") != -1);
this.isIcab = (ua.indexOf("icab") != -1);
this.isAol = (ua.indexOf("aol") != -1);
this.isWebtv = (ua.indexOf("webtv") != -1);
this.isOmniweb = (ua.indexOf("omniweb") != -1);
this.isDreamcast = (ua.indexOf("dreamcast") != -1);

// spoofing and compatible browsers
this.isIECompatible = ( (ua.indexOf("msie") != -1) && !this.isIE);
this.isNSCompatible = ( (ua.indexOf("mozilla") != -1) && !this.isNS && !this.isMozilla);

// browser version
this.versionMinor = parseFloat(navigator.appVersion);

// correct version number for NS6+
if (this.isNS && this.isGecko) {
this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('/') + 1 ) );
}

// correct version number for IE4+
else if (this.isIE && this.versionMinor >= 4) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('msie ') + 5 ) );
}

// correct version number for Opera
else if (this.isOpera) {
if (ua.indexOf('opera/') != -1) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('opera/') + 6 ) );
}
else {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('opera ') + 6 ) );
}
}

// correct version number for Konqueror
else if (this.isKonqueror) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('konqueror/') + 10 ) );
}

// correct version number for iCab
else if (this.isIcab) {
if (ua.indexOf('icab/') != -1) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('icab/') + 6 ) );
}
else {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('icab ') + 6 ) );
}
}

// correct version number for WebTV
else if (this.isWebtv) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('webtv/') + 6 ) );
}

this.versionMajor = parseInt(this.versionMinor);
this.geckoVersion = ( (this.isGecko) ? ua.substring( (ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14) ) : -1 );

// platform
this.isWin = (ua.indexOf('win') != -1);
this.isWin32 = (this.isWin && ( ua.indexOf('95') != -1 || ua.indexOf('98') != -1 || ua.indexOf('nt') != -1 || ua.indexOf('win32') != -1 || ua.indexOf('32bit') != -1) );
this.isMac = (ua.indexOf('mac') != -1);
this.isUnix = (ua.indexOf('unix') != -1 || ua.indexOf('linux') != -1 || ua.indexOf('sunos') != -1 || ua.indexOf('bsd') != -1 || ua.indexOf('x11') != -1)

// specific browser shortcuts
this.isNS4x = (this.isNS && this.versionMajor == 4);
this.isNS40x = (this.isNS4x && this.versionMinor < 4.5);
this.isNS47x = (this.isNS4x && this.versionMinor >= 4.7);
this.isNS4up = (this.isNS && this.versionMinor >= 4);
this.isNS6x = (this.isNS && this.versionMajor == 6);
this.isNS6up = (this.isNS && this.versionMajor >= 6);

this.isIE4x = (this.isIE && this.versionMajor == 4);
this.isIE4up = (this.isIE && this.versionMajor >= 4);
this.isIE5x = (this.isIE && this.versionMajor == 5);
this.isIE55 = (this.isIE && this.versionMinor == 5.5);
this.isIE5up = (this.isIE && this.versionMajor >= 5);
this.isIE6x = (this.isIE && this.versionMajor == 6);
this.isIE6up = (this.isIE && this.versionMajor >= 6);

this.isIE4xMac = (this.isIE4x && this.isMac);
}
var browser = new BrowserDetectLite();

edbr
07-17-2009, 08:32 AM
its a function to detect the visitors browser type

houserabbit
07-17-2009, 08:38 AM
its a function to detect the visitors browser type


what the purpose to detect visitor browser
i see the code is write
// correct version number for NS6+
if (this.isNS && this.isGecko) {
this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('/') + 1 ) );
}
why need to correct the version here??

edbr
07-17-2009, 08:43 AM
// correct version number for NS6+
is just a comment not a part of the function

houserabbit
07-17-2009, 08:46 AM
// correct version number for NS6+
is just a comment not a part of the function



but below it is the script
if (this.isNS && this.isGecko) {
this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('/') + 1 ) );
}

edbr
07-17-2009, 08:52 AM
so what? what do you want to know about this?
it detects browser versions

houserabbit
07-17-2009, 09:03 AM
so what? what do you want to know about this?
it detects browser versions

ok..i know
thank:lol: