Javascript检测系统信息各个浏览器信息

var sUserAgent = navigator.userAgent;
var fAppVersion = parseFloat(navigator.appVersion);
//比较浏览器版本大小
function compareVersions(sVersion1,sVersion2){
    var aVersion1 = sVersion1.split(".");
    var aVersion2 = sVersion2.split(".");

    if(aVersion1.length>aVersion2.length){
        for(var i=0;i<aVersion1.length;i++)
            aVersion2.push("0");
    }else if(aVersion1.length<aVersion2.length){
        for(var i=0;i<aVersion2.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;
};

//检测是否Opera浏览器
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 (http://www.cnblogs.com/eoiioe/admin/file://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;
};

//检测是否Safari
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\\/(http://www.cnblogs.com/eoiioe/admin/file://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\\/(http://www.cnblogs.com/eoiioe/admin/file://d+(/?:\\.\\d+(?:\\.\\d)?)?)");
&n