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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 45 - Try It (Browser)</title>
</head>
<body>
  <h1>Zero + Star Cross (document.write)</h1>
  <p>Edit rows/cols and click Run.</p>

  <script>
    var i, j;
    var rows = 4;
    var cols = 9;
    var middle = (cols + 1) / 2;

    for (i = 1; i <= rows; i++) {
      for (j = 1; j <= cols; j++) {
        if (i == j || j == middle || i == cols + 1 - j)
          document.write("*");
        else
          document.write("0");
      }
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 45 (Try It — Browser)