js 单选框的值

<form id="myForm">
  <input type="radio" id="option1" name="group1" value="Option 1">
  <label for="option1">Option 1</label><br>
  <input type="radio" id="option2" name="group1" value="Option 2">
  <label for="option2">Option 2</label><br>
  <input type="radio" id="option3" name="group1" value="Option 3">
  <label for="option3">Option 3</label><br>
  <button type="button" onclick="getSelectedValue()">Submit</button>
</form>

<script>
function getSelectedValue() {
  const radios = document.getElementsByName('group1');
  let selectedValue;
  for (let i = 0; i < radios.length; i++) {
    if (radios[i].checked) {
      selectedValue = radios[i].value;
      break;
    }
  }
  alert('Selected value: ' + selectedValue);
}
</script>