检查获取各种浏览器的版本

chrome

function getChromeVersion() {
    var arr = navigator.userAgent.split(' ');
    var chromeVersion = '';
    for(var i=0;i < arr.length;i++){
        if(/chrome/i.test(arr[i]))
            chromeVersion = arr[i]
    }
    if(chromeVersion){
        return Number(chromeVersion.split('/')[1].split('.')[0]);
    } else {
        return false;
    }
}

firefox

function getFireFoxVersion(){
    var match = window.navigator.userAgent.match(/Firefox\/([0-9]+)\./);
    return match ? parseInt(match[1]) : 0;
}

ie

function IEVersion() {
    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1; //判断是否IE<11浏览器
    var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器
    var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;
    if(isIE) {
        var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
        reIE.test(userAgent);
        var fIEVersion = parseFloat(RegExp["$1"]);
        if(fIEVersion == 7) {
            return 7;
        } else if(fIEVersion == 8) {
            return 8;
        } else if(fIEVersion == 9) {
            return 9;
        } else if(fIEVersion == 10) {
            return 10;
        } else {
            return 6;//IE版本<=7
        }
    } else if(isEdge) {
        return 'edge';//edge
    } else if(isIE11) {
        return 11; //IE11
    }else{
        return 0;//不是ie浏览器
    }
}

safari(可能不准确或无法执行)
safari浏览器可以参考chrome他们的内核相差无几
safari:webkit内核; chrome:blink内核

function safariChecker(){
    return /AppleWebKit/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent);
}