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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 31 - Try It (Browser)</title>
</head>
<body>
  <h1>Number + Asterisk Diamond (document.write)</h1>
  <p>Edit <code>max</code>, then click Run.</p>
  <script>
    var max = 5;
    var i, j;
    for (i = 1; i <= max; i++) {
      for (j = 1; j < i * 2; j++) {
        if (j % 2 == 0)
          document.write("*");
        else
          document.write(i);
      }
      document.write("<br>");
    }
    for (i = max - 1; i >= 1; i--) {
      for (j = 1; j < i * 2; j++) {
        if (j % 2 == 0)
          document.write("*");
        else
          document.write(i);
      }
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 31 (Try It — Browser)