判断当前系统当前浏览器是否安装启用 Adobe Flash Player，检查在chrome中的状态

一、判断当前所在系统

let sUserAgent = navigator.userAgent;
let isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");
let isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel");
if (isMac) return "Mac";
let isUnix = (navigator.platform == "X11") && !isWin && !isMac;
if (isUnix) return "Unix";
let isLinux = (String(navigator.platform).indexOf("Linux") > -1);
if (isLinux) return "Linux";
if (isWin) {
    let isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1;
    if (isWin2K) return "Windows2000";
    let isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || sUserAgent.indexOf("Windows XP") > -1;
    if (isWinXP) return "WindowsXP";
    let isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;
    if (isWin2003) return "Windows2003";
    let isWinVista = sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;
    if (isWinVista) return "WindowsVista";
    let isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;
    if (isWin7) return "Windows7";
    let isWin8 = sUserAgent.indexOf("Windows NT 6.2") > -1 || sUserAgent.indexOf("Windows 8") > -1;
    if (isWin8) return "Windows8";
    let isWin10 = sUserAgent.indexOf("Windows NT 10.0") > -1 || sUserAgent.indexOf("Windows 10") > -1;
    if (isWin10) return "Windows10";
}
return "OtherOS";

二、判断当前浏览器内核

let Sys = {};
let ua = navigator.userAgent.toLowerCase();
let s;
(s = ua.match(/msie ([d.]+)/)) ? Sys.ie = s[1] :
    (s = ua.match(/firefox/([d.]+)/)) ? Sys.firefox = s[1] :
        (s = ua.match(/chrome/([d.]+)/)) ? Sys.chrome = s[1] :
            (s = ua.match(/version/([d.]+).*safari/)) ? Sys.safari = s[1] : 0;

if (Sys.ie) {
    console.log('ie core')
}
if (Sys.firefox) {
    console.log('gecko core')
}
if (Sys.chrome || Sys.safari) {
    console.log('webkit core')
}

三、判断浏览器是否安装 Adobe Flash Player

    let version = -1;
    if (window.ActiveXObject) {
        try {
            let swf = new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
            version = parseInt(swf.Getletiable("$version").split(" ")[1].split(",")[0]);
        }
        catch (e) {
        }
    }
    else {
        if (navigator.plugins && navigator.plugins["Shockwave Flash"]) {
            let arr = navigator.plugins['Shockwave Flash'].description.split(' ');
            let i = 0;
            let length = arr.length;
            if (arr) {
                for (; i < length; i++) {
                    if (!isNaN(Number(arr[i]))) {
                        version = Number(arr[i]);
                        break;
                    }
                }
            }
        }
    }
    if (version == -1) {
       //没有安装flash
    } else {
       //已安装flash
    }
}

三、判断在Chrome中的状态

/* 检测flash在chrome中的状态
 * 若flash已安装已启用已允许且是最新版
 * 则 plugin.name 的值为 "pepflashplayer.dll"
 * 否则 plugin.name 的值为 "internal-not-yet-present"
*/
for (var i = 0, len = navigator.plugins.length; i < len; i++) {
    var plugin = navigator.plugins[i];
    if (plugin.name == 'Shockwave Flash') {
        if (plugin.filename == 'internal-not-yet-present') {

            //plugin.name 的值为 "internal-not-yet-present"

        }
        break;
    }
}