<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Navigator</title>
</head>

<body>

<script>
  //获取当前的浏览器信息
  var sys = GetBrowserInfo();
  //sys.browser得到浏览器的类型，sys.ver得到浏览器的版本
  document.write(sys.browser + "：" + sys.ver);

  function GetBrowserInfo() {
    var ua = navigator.userAgent.toLowerCase();
    var re = /(msie|firefox|chrome|opera|version).*?([\d.]+)/;
    var m  = ua.match(re);

    var Sys = {};
    Sys.browser = m[1].replace(/version/, "safari");
    Sys.ver = m[2];
    return Sys;
  }
</script>

</body>
</html>

Javascript 浏览器检测_firefox