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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Permutations of 3 numbers</title>
</head>
<body>
  <h1>All orderings (permutations)</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var arr = [1, 2, 3];
      var lines = [];
      var i;
      var j;
      var k;
      lines.push("All orderings (permutations) of the three numbers:");
      for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
          for (k = 0; k < 3; k++) {
            if (i !== j && j !== k && i !== k) {
              lines.push(arr[i] + " " + arr[j] + " " + arr[k]);
            }
          }
        }
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Number Combination — Permutations of 3 Numbers (Try It)