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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Disarium — left to right</title>
</head>
<body>
  <h1>Left-to-right digit positions</h1>
  <p>Edit the values in the <code>tests</code> array, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function isDisariumLtr(number) {
        if (number <= 0) {
          return false;
        }
        var total = 0;
        var s = String(number);
        var pos;
        for (pos = 1; pos <= s.length; pos++) {
          total += Number(s[pos - 1]) ** pos;
        }
        return total === number;
      }
      var tests = [89, 135, 10, 7];
      var lines = [];
      for (var i = 0; i < tests.length; i++) {
        var n = tests[i];
        var label = isDisariumLtr(n) ? "Disarium" : "not Disarium";
        lines.push(n + ": " + label);
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Disarium — Left-to-right string (Try It)