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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.charCodeAt()</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var s = "Hi";
    document.getElementById("out").textContent = [
      s.charCodeAt(),
      s.charCodeAt(0),
      s.charCodeAt(1),
      String(s.charCodeAt(2)),
      String(s.charCodeAt(-1)),
      String(s.charCodeAt(999)),
      Number.isNaN(s.charCodeAt(2))
    ].join("\n");
  </script>
</body>
</html>

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String.charCodeAt() — range & NaN (Try It)