如何使网站仅在某些浏览器中运行？

Question

How to make a check on a client's browser on a website? I was given the task that the website was supported only by Google Chrome or Firefox

When user uses other browsers, a blank page should appear with text similar to

Your browser is not supported by the system.
Use Google Chrome or Firefox Browsers

Answer 1

By checking the string navigator.userAgent

Check the function bellow, and adapt it to your needs.

function wichBrowser() {
  // CHROME
  if (navigator.userAgent.indexOf("Chrome") > -1 ) {
    return "Google Chrome"
  }
  // FIREFOX
  else if (navigator.userAgent.indexOf("Firefox") > -1 ) {
    return "Mozilla Firefox"
  }
  // INTERNET EXPLORER
  else if (navigator.userAgent.indexOf("MSIE") > -1 ) {
    return "Internet Exploder"
  }
  // EDGE
  else if (navigator.userAgent.indexOf("Edge") > -1 ) {
    return "Edge"
  }
  // SAFARI
  else if (navigator.userAgent.indexOf("Safari") > -1 ) {
    return "Safari"
  }
  // OPERA
  else if (navigator.userAgent.indexOf("Opera") > -1 ) {
    return "Opera"
  }
  // YANDEX BROWSER
  else if (navigator.userAgent.indexOf("Opera") > -1 ) {
    return "YaBrowser"
  }
  // OTHERS
  else {
    return "Others"
  }
};