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;     } }