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  <title>Decimal to octal — remainder</title>
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  <h1>Divide by 8, reverse print</h1>
  <p>Edit <code>decimalNumber</code> (nonnegative, fits <code>&gt;&gt;&gt; 0</code>), then <strong>Run</strong>.</p>
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  <script>!function(){function t(t){var n=[],e=t>>>0;if(0===e)return"Octal equivalent: 0";for(;0!==e;)n.push(e%8),e=Math.floor(e/8);var r,o="Octal equivalent: ";for(r=n.length-1;r>=0;r--)o+=String(n[r]);return o}var n=[];n.push(t(57)),n.push(t(0)),document.getElementById("out").textContent=n.join(String.fromCharCode(10))}()</script>
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JavaScript Decimal to Octal — array + reverse (Try It)