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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Decimal to octal — remainder</title>
</head>
<body>
  <h1>Divide by 8, reverse digits</h1>
  <p>Edit the calls at the bottom, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function decimalToOctal(n) {
        if (n === 0) {
          return "0";
        }
        var digits = [];
        while (n > 0) {
          digits.push(String(n % 8));
          n = Math.floor(n / 8);
        }
        return digits.reverse().join("");
      }
      var lines = [];
      lines.push("Octal equivalent: " + decimalToOctal(57));
      lines.push("Octal equivalent: " + decimalToOctal(0));
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Decimal to Octal — remainder + reverse (Try It)