js判断浏览器类型并区分IE不同版本

js判断浏览器类型并区分IE不同版本代码：

function myBrowser(){
    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
    var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera
    var isMaxthon = userAgent.indexOf("Maxthon") > -1 ; //判断是否傲游3.0
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera ; //判断是否IE
    var isFF = userAgent.indexOf("Firefox") > -1 ; //判断是否Firefox
    var isSafari = userAgent.indexOf("Safari") > -1 && userAgent.indexOf("Chrome") < 1 ; //判断是否Safari var isChrome = userAgent.indexOf("Chrome") > -1 ; //判断是否Chrome

    if(isIE){
        var IE5 = IE55 = IE6 = IE7 = IE8 = false;
        var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
        reIE.test(userAgent);
        var fIEVersion = parseFloat(RegExp["$1"]);
        IE55 = fIEVersion == 5.5;
        IE6 = fIEVersion == 6.0;
        IE7 = fIEVersion == 7.0;
        IE8 = fIEVersion == 8.0;

        if(IE55){ return "IE55"; }
        if(IE6){ return "IE6"; }
        if(IE7){ return "IE7"; }
        if(IE8){ return "IE8"; }
    }

    if(isFF){ return "FF"; }
    if(isOpera){ return "Opera"; }
    if(isMaxthon){ return "Maxthon"; }
    if(isSafari){ return "Safari"; }
    if(isChrome){ return "Chrome"; }
    if(document.all && document.addEventListener && !window.atob){
        return "IE9";
    }
    if(document.all && document.addEventListener && window.atob){
        return "IE10";
    }
}
//判断谷歌浏览器
if(myBrowser() == 'Chrome'){
    console.log('this is Chrome');
}