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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 23 - Try It (Browser)</title>
</head>
<body>
  <h1>Number + Asterisks (document.write)</h1>
  <p>Edit loop limits, then click Run.</p>

  <script>
    var size = 5;
    for (var i = size; i >= 1; i--) {
      for (var j = 1; j <= i; j++)
        document.write(j);

      for (var k = i; k < size; k++)
        document.write("**");

      for (var m = i; m >= 1; m--)
        document.write(m);

      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 23 (Try It — Browser)