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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 25 - Try It (Browser)</title>
</head>
<body>
  <h1>Repeating Number Pattern (document.write)</h1>
  <p>Edit <code>rows</code>, then click Run.</p>

  <script>
    var rows = 5;
    for (var i = 1; i <= rows; i++) {
      for (var j = i; j <= rows; j++) {
        if (i < 4)
          document.write(i);
        else
          document.write(rows + 1 - i);
      }
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 25 (Try It — Browser)