是否可以获取用户表单中的帧数和帧中的选项按钮的数量？

<form id="myForm">
  <fieldset>
    <legend>帧1</legend>
    <input type="radio" name="option1" value="1">选项1
    <input type="radio" name="option1" value="2">选项2
    <input type="radio" name="option1" value="3">选项3
  </fieldset>
  <fieldset>
    <legend>帧2</legend>
    <input type="radio" name="option2" value="1">选项1
    <input type="radio" name="option2" value="2">选项2
    <input type="radio" name="option2" value="3">选项3
  </fieldset>
</form>

<script>
  var form = document.getElementById("myForm");
  var frames = form.querySelectorAll("fieldset");
  var frameCount = frames.length;
  console.log("帧数：" + frameCount);
</script>

<form id="myForm">
  <fieldset>
    <legend>帧1</legend>
    <input type="radio" name="option1" value="1">选项1
    <input type="radio" name="option1" value="2">选项2
    <input type="radio" name="option1" value="3">选项3
  </fieldset>
</form>

<script>
  var form = document.getElementById("myForm");
  var frame = form.querySelector("fieldset");
  var options = frame.querySelectorAll("input[type='radio']");
  var optionCount = options.length;
  console.log("选项按钮数量：" + optionCount);
</script>