how to check browser version and set alert

Issue

I want to create code which will auto get the user's browser version and check it , if it was for example less than 50 popup alert which say "You can not access to this website(Update your Browser)" and open error page.

Solution

    function get_version() {
  let ua = navigator.userAgent,
    tem,
    M =
      ua.match(
        /(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i
      ) || [];
  if (/trident/i.test(M[1])) {
    tem = /\brv[ :]+(\d+)/g.exec(ua) || [];
    return { name: "IE", version: tem[1] || "" };
  }
  if (M[1] === "Chrome") {
    tem = ua.match(/\bOPR|Edge\/(\d+)/);
    if (tem != null) {
      return { name: "Opera", version: tem[1] };
    }
  }
  M = M[2] ? [M[1], M[2]] : [navigator.appName, navigator.appVersion, "-?"];
  if ((tem = ua.match(/version\/(\d+)/i)) != null) {
    M.splice(1, 1, tem[1]);
  }
  return {
    name: M[0],
    version: M[1],
  };
}

let browser = get_version();

// you can use these two in anywhere 
console.log(browser.name,browser.version)

Answered By - shay232