【JavaScript】检测浏览器和操作系统_检测浏览器及操作系统-优快云博客

本文介绍了一种使用JavaScript检测用户浏览器类型及操作系统的实用方法。通过分析用户代理字符串，可以识别不同浏览器及其版本，并判断用户所使用的操作系统。此技术有助于确保网站能够适配各种设备。

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【JavaScript】检测浏览器和操作系统

注：代码转自《Professional JavaScript™ for Web Developers》一书。

Web编程中，识别用户的浏览器以及操作系统非常重要。因为它们对HTML和JavaScript的支持程度有所不同。

一般应用在系统登陆页面或者首页中。

具体应用如下：

<html>
     <head>
         <title>Login</title>
         <script type="text/javascript" src="detect.js"></script>
         <script type="text/javascript">
            window.onload = function () {
                if ((isMinIE5_5 && isWin) || (isMinMoz1 && 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><td><input type="text" name="txtUsername" /></td>
                         </tr>
                         <tr>
                             <td>Password:</td><td><input type="password" name="txtPassword" /></td>
                         </tr>
                         <tr>
                             <td> </td><td><input type="Submit" value="Login" /></td>
                         </tr>
                     </table>
                 </td></tr></table>
                 </div>
             </div>
         </form>
     </body>
</html>

detect.js

/* ************************************************************************
    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 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 ;
    }
}