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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Number constructor</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent = [
      String(Number()),
      String(Number("")),
      String(Number("  42  ")),
      String(Number(true)),
      String(Number(null)),
      String(Number(undefined)),
      String(Number("abc"))
    ].join("\n");
  </script>
</body>
</html>

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Number constructor — convert values (Try It)