Check for IE (JS)

example.js

// Check for IE
// ------------------------------------------------
var ie = (function(){
  var undef;
  var v = 3;
  var div = document.createElement('div');
  var all = div.getElementsByTagName('i');

  while (
    div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
    all[0]
  );

  return v > 4 ? v : undef;
}());



// Example usage
// ------------------------------------------------
if (ie) {
  console.log("Rats, they're using IE");
} else if (!ie) {
  console.log("Hooray, it's not IE!");
}