HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>images length</title>
</head>
<body>
  <img src="https://via.placeholder.com/80" alt="One">
  <img src="https://via.placeholder.com/80/000/fff" alt="Two">
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      document.images.length + "\n" +
      "Has images? " + (document.images.length > 0);
  </script>
</body>
</html>

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document.images — count (Try It)