如何在选择某个选项后显示文本区

<form>
  <label for="option1">选项1</label>
  <input type="radio" id="option1" name="options" onchange="showText(this.value)">
  <label for="option2">选项2</label>
  <input type="radio" id="option2" name="options" onchange="showText(this.value)">
</form>

<div id="textArea" style="display: none;">
  <textarea></textarea>
</div>

function showText(option) {
  var textArea = document.getElementById("textArea");
  if (option === "option1") {
    textArea.style.display = "block";
  } else {
    textArea.style.display = "none";
  }
}