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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 37 - Try It (Browser)</title>
</head>
<body>
  <h1>Reverse-Forward Triangle (document.write)</h1>
  <p>Edit <code>rows</code>, then click Run.</p>

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

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JavaScript Number Pattern 37 (Try It — Browser)