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<head>
  <meta charset="utf-8">
  <title>String.fromCharCode() — round-trip</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var codes = [..."Hi"].map(function (c) { return c.charCodeAt(0); });
    document.getElementById("out").textContent = [
      String("A".charCodeAt(0)),
      String.fromCharCode("A".charCodeAt(0)),
      String.fromCharCode.apply(null, codes)
    ].join("\n");
  </script>
</body>
</html>

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String.fromCharCode() — round-trip (Try It)