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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 54 - Try It (Browser)</title>
</head>
<body>
  <h1>Mirrored Diagonal Number Diamond (&nbsp; spacing)</h1>
  <p>Edit n and click Run.</p>

  <script>
    var n = 5;
    var width = 2 * n - 1;

    function printRow(i) {
      for (var col = 1; col <= width; col++) {
        if (col === i || col === width - i + 1) document.write(i);
        else document.write("&nbsp;");
      }
      document.write("<br>");
    }

    for (var i = 1; i <= n; i++) printRow(i);
    for (var i2 = n - 1; i2 >= 1; i2--) printRow(i2);
  </script>
</body>
</html>

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JavaScript Number Pattern 54 (Try It — Browser)