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<![CDATA[Heck's Blog]]> https://www.heckjj.com/index.php zh-cn https://www.heckjj.com/javascript-js-detect-browser/ <![CDATA[js javaScript检测浏览器和操作系统平台]]> Heck <@hecks.tk> Fri, 10 Sep 2010 05:15:25 +0000 https://www.heckjj.com/javascript-js-detect-browser/ 今天看JavaScript高级程序设计第8章检测浏览器和操作系统时，发现浏览器发展历史带着一种没有统一规范的过程走到了今天，这些混乱的过程，主要体现在user-agent字符串内容上，用了Win的人，很多都无知地认为世界只有IE这么一个浏览器，对他们来说带着一种打开浏览器就是打开IE的意思，没有Mozilla,Opera,Konqueror,Safari,NetScape这些可选的概念，但对于Web人员则不能对这些无知了，一个可靠的javaScript脚必须针对不同的客户平台作出不同准确识别，不单是浏览器类型对javaScript函数调用有关，浏览器依附的操作系统平台对浏览器的支持功能也有制约和支持,书中附带的detect.js，软完整给出了针对一系列用户浏览器和操作系统平台的检测，虽然直接对Code看难理解，不过跟着书本解析，理解起来还是不难的，里面几乎全是通过对user-agent字符串信息分析得到的,我往代码里添加了自己的注释。

detect.js

//全局变量
//userAgent--用户代理头字符串的字符串表示
//appVersion--浏览器版本信息的字符串表示
var sUserAgent = navigator.userAgent;
var fAppVersion = parseFloat(navigator.appVersion);

//比较usr-agent字符串里关于浏览器版本信息，两个比较参数不等位的，就在位小的一个后面全补0
/**
 * @params Version1, sVersion2 比较参数
 * @return 1表示version1版本高,-1表示sVersion2版本高，0表示两个user-Agent版本一样
 * 通过指定某一个版本参数，再根据返回值，则得知用户浏览器的版本信息
 */
function compareVersions(sVersion1, sVersion2) {

}

//检测是不是Opera浏览器
var isOpera = sUserAgent.indexOf("Opera") > -1;
var isMinOpera4 = isMinOpera5 = isMinOpera6 = isMinOpera7 = isMinOpera7_5 = false;

if (isOpera) {
    var fOperaVersion;
    //检测user-agent以Opera开始,得到浏览器版本数字
    if(navigator.appName == "Opera") {
        fOperaVersion = fAppVersion;
    } else {
      //检测user-agent其中包含Opera和一或多个数字，再带一个.再带一个或多个数字;得到浏览器版本数字
        var reOperaVersion = new RegExp("Opera (\\d+\\.\\d+)");
        reOperaVersion.test(sUserAgent);
        fOperaVersion = parseFloat(RegExp["$1"]);
    }

//得到准确的Opera版本类型
    isMinOpera4 = fOperaVersion >= 4;
    isMinOpera5 = fOperaVersion >= 5;
    isMinOpera6 = fOperaVersion >= 6;
    isMinOpera7 = fOperaVersion >= 7;
    isMinOpera7_5 = fOperaVersion >= 7.5;
}

//检测是不是KTHML或Safari浏览器
var isKHTML = sUserAgent.indexOf("KHTML") > -1 
              || sUserAgent.indexOf("Konqueror") > -1 
              || sUserAgent.indexOf("AppleWebKit") > -1; 
//默认组赋值
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;
    } 
    
}

//检测是不是IE浏览器
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;
}

//检测是不是Mozllia浏览器
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;
}

//检测是不是NetScape Communicator4.x浏览器
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;
}

//~~~~~~~~~~~~~~检测客户操作系统平台~~~~~~~~~~~

//检测Win平台标志
var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");

//检测Macintosh平台标志
var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") 
            || (navigator.platform == "Macintosh");

//检测Unix平台标志
var isUnix = (navigator.platform == "X11") && !isWin && !isMac;

//平台具体版本号组赋值
var isWin95 = isWin98 = isWinNT4 = isWin2K = isWinME = isWinXP = false;
var isMac68K = isMacPPC = false;
var isSunOS = isMinSunOS4 = isMinSunOS5 = isMinSunOS5_5 = false;

//得到准确的平台版本类型
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);
}

//得到准确的平台版本类型
if (isMac) {
    isMac68K = sUserAgent.indexOf("Mac_68000") > -1 
               || sUserAgent.indexOf("68K") > -1;
    isMacPPC = sUserAgent.indexOf("Mac_PowerPC") > -1 
               || sUserAgent.indexOf("PPC") > -1;  
}

//得到准确的平台版本类型
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;
    }
}

Tags - js , javascript检测浏览器 , 操作系统平台 ]]> https://www.heckjj.com/javascript-js-detect-browser/#blogcomment <![CDATA[[评论] js javaScript检测浏览器和操作系统平台]]> <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 https://www.heckjj.com/javascript-js-detect-browser/#blogcomment