『JavaScript高度プログラム設計』読書ノート(十六):javascript検出ブラウザとオペレーティングシステム-detect.js

ブラウザの検出方法
1、対象特徴検出法:ブラウザの能力を判断する一般的な方法.この検出方法は、ブラウザの機能に注目し、実際のアイデンティティを気にしない場合に使用できます.一般的なオリジナルAjaxの書き方では、XMLHttpRequestを作成するためにこの方法が使用されます.

IXHR: function(){

    if(window.ActiveXObject){

            XHR=new ActiveXObject('Microsoft.XMLHTTP');

        }else if(window.XMLHttpRequest){

            XHR=new XMLHttpRequest();

        }else{

            return null;

        }

}

2、user-agent文字列検出法:ブラウザ可能なuser-agent文字列を解析することで判断し、判断方法は以下のdetect.js中
プラットフォーム/オペレーティングシステムの検出
判断方法は、navigatorがplatform属性とuser-agent文字列を折り曲げることによって判断する、以下のdetect.js中
ブラウザとオペレーティングシステム-detectを検出します.js

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 isMinMoz1 = sMinMoz1_4 = isMinMoz1_5 = false;

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;

}

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 >= 4.5;

    isMinNS4_7 = fAppVersion >= 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 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);

}

if (isMac) {

    isMac68K = sUserAgent.indexOf("Mac_68000") > -1

               || sUserAgent.indexOf("68K") > -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;

    }

}