checkBrowser.js

function checkBrowser() {
    var appName = window.navigator.appName;
    var appVersion = window.navigator.appVersion;
    var strPlatform = window.navigator.platform;
    var appCodeName = window.navigator.appCodeName;
    var userAgent = window.navigator.userAgent;

    var BrowserName = ""
    var BrowserVersion = ""

    if (appVersion.indexOf("MSIE") != -1) {
        BrowserName = "Internet Explorer";

        var re = new RegExp("MSIE (\\S){1,16}\\b");
        var m = re.exec(userAgent);
        if (m != null) {
            BrowserVersion = m[0].replace("MSIE ", "");
        }
    }
    else if (appVersion.indexOf("Trident") != -1) { //for IE 11.x
        BrowserName = "Internet Explorer";
        var re = new RegExp("rv:(\\S){1,16}\\b");
        var m = re.exec(userAgent);
        if (m != null) {
            BrowserVersion = m[0].replace("rv:", "");
        }
    }
    else if ((appName.indexOf("Netscape") != -1) &&
        (appCodeName.indexOf("Mozilla") != -1) &&
        (userAgent.indexOf("Firefox") != -1)) {
        BrowserName = "Firefox";

        var re = new RegExp("Firefox/(\\S){1,16}\\b");
        var m = re.exec(userAgent);
        if (m != null) {
            BrowserVersion = m[0].replace("Firefox/", "");
        }
    }
    else if ((appName.indexOf("Opera") != -1) &&
        (appCodeName.indexOf("Mozilla") != -1) &&
        (userAgent.indexOf("Opera") != -1)) {
        BrowserName = "Opera";

        var re = new RegExp("Opera/(\\S){1,16}\\b");
        var m = re.exec(userAgent);
        if (m != null) {
            BrowserVersion = m[0].replace("Opera/", "");
        }
    }
    else if ((appName.indexOf("Netscape") != -1) &&
        (appCodeName.indexOf("Mozilla") != -1) &&
        (userAgent.indexOf("Chrome") != -1)) {
        BrowserName = "Chrome";

        var re = new RegExp("Chrome/(\\S){1,16}\\b");
        var m = re.exec(userAgent);
        if (m != null) {
            BrowserVersion = m[0].replace("Chrome/", "");
        }
    }

    return {Name: BrowserName, Ver: parseFloat(BrowserVersion), Platform: strPlatform};
}