用javascript检测Mountain Lion(OS X 10.8)？

关于使用JavaScript检测Mountain Lion（OS X 10.8）的问题，我们可以通过浏览器的UserAgent来判断用户所使用的操作系统。以下是一个简单的示例代码：

function getOS() {
  var userAgent = window.navigator.userAgent;
  var os = "Unknown";
  var osVersion = "Unknown";

  if (userAgent.indexOf("Mac OS X 10_8") !== -1) {
    os = "Mac OS X";
    osVersion = "Mountain Lion (10.8)";
  } else if (userAgent.indexOf("Mac OS X 10_9") !== -1) {
    os = "Mac OS X";
    osVersion = "Mavericks (10.9)";
  } else if (userAgent.indexOf("Mac OS X 10_10") !== -1) {
    os = "Mac OS X";
    osVersion = "Yosemite (10.10)";
  } else if (userAgent.indexOf("Mac OS X 10_11") !== -1) {
    os = "Mac OS X";
    osVersion = "El Capitan (10.11)";
  } else if (userAgent.indexOf("Mac OS X 10_12") !== -1) {
    os = "Mac OS X";
    osVersion = "Sierra (10.12)";
  } else if (userAgent.indexOf("Mac OS X 10_13") !== -1) {
    os = "Mac OS X";
    osVersion = "High Sierra (10.13)";
  } else if (userAgent.indexOf("Mac OS X 10_14") !== -1) {
    os = "Mac OS X";
    osVersion = "Mojave (10.14)";
  } else if (userAgent.indexOf("Mac OS X 10_15") !== -1) {
    os = "Mac OS X";
    osVersion = "Catalina (10.15)";
  } else if (userAgent.indexOf("Mac OS X 10_16") !== -1) {
    os = "Mac OS X";
    osVersion = "Big Sur (10.16)";
  } else if (userAgent.indexOf("Mac OS X 11_0") !== -1) {
    os = "Mac OS X";
    osVersion = "Big Sur (11.0)";
  }

  return "Operating System: " + os + ", Version: " + osVersion;
}

console.log(getOS());

这段代码会检测用户的操作系统，并返回操作系统名称和版本。在这个示例中，我们主要关注Mountain Lion（OS X 10.8）的检测。如果用户的操作系统是Mountain Lion，则会返回 "Operating System: Mac OS X, Version: Mountain Lion (10.8)"。

需要注意的是，UserAgent可能会被用户或浏览器伪装，因此这种方法并不是100%可靠的。在实际应用中，可以结合其他方法来提高检测的准确性。