JSFiddle - React, Tailwind, and code Playground

by Lucas Costa

JavaScript

function identificarBrowse() {
    var nav = navigator.userAgent.toLowerCase();
    console.log(nav)
    if (nav.indexOf("msie") != -1
        || getInternetExplorerVersion() != -1) {
        alert("IE");
    } 
}

function getInternetExplorerVersion()
{
  var rv = -1;
  if (navigator.appName == 'Microsoft Internet Explorer')
  {
    var ua = navigator.userAgent;
    var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
    if (re.exec(ua) != null)
      rv = parseFloat( RegExp.$1 );
  }
  else if (navigator.appName == 'Netscape')
  {
    var ua = navigator.userAgent;
    var re  = new RegExp("Trident/.*rv:([0-9]{1,}[\.0-9]{0,})");
    if (re.exec(ua) != null)
      rv = parseFloat( RegExp.$1 );
  }
  return rv;
}

identificarBrowse();