获取单选框内标签的名称

<div id="radioContainer">
  <input type="radio" name="option" value="option1" id="option1">
  <label for="option1">选项1</label>
  <br>
  <input type="radio" name="option" value="option2" id="option2">
  <label for="option2">选项2</label>
  <br>
  <input type="radio" name="option" value="option3" id="option3">
  <label for="option3">选项3</label>
</div>
<button onclick="getSelectedOption()">获取选中的选项</button>

function getSelectedOption() {
  var radioContainer = document.getElementById("radioContainer");
  var radios = radioContainer.getElementsByTagName("input");
  
  for (var i = 0; i < radios.length; i++) {
    if (radios[i].checked) {
      var label = radioContainer.querySelector('label[for="' + radios[i].id + '"]');
      var selectedOption = label.innerHTML;
      console.log("选中的选项是：" + selectedOption);
      break;
    }
  }
}