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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Example</title>
</head>
<body>
<script>
  (function() {
    "use strict";
    window.onbeforeunload = function() {
      sessionStorage.setItem("left", Date.now());
    };
    var left = sessionStorage.getItem("left");
    if (left && (Date.now() - left) < 2000) {
      // Refreshed
      display("Refreshed");
    } else {
      display("New load");
    }
    function display(msg) {
      var p = document.createElement('p');
      p.innerHTML = String(msg);
      document.body.appendChild(p);
    }
  })();
</script>
</body>
</html>
Output

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