如何更改基于单选按钮选择的下拉选择？

<input type="radio" name="options" value="option1"> Option 1
<input type="radio" name="options" value="option2"> Option 2
<input type="radio" name="options" value="option3"> Option 3

<select id="dropdown">
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

var radioButtons = document.getElementsByName("options");
var dropdown = document.getElementById("dropdown");

for (var i = 0; i < radioButtons.length; i++) {
  radioButtons[i].addEventListener("change", function() {
    var selectedOption = this.value;
    
    // 根据选择的值更改下拉选择框的选项
    if (selectedOption === "option1") {
      dropdown.innerHTML = `
        <option value="option1">Option 1</option>
        <option value="option2">Option 2</option>
        <option value="option3">Option 3</option>
      `;
    } else if (selectedOption === "option2") {
      dropdown.innerHTML = `
        <option value="option4">Option 4</option>
        <option value="option5">Option 5</option>
        <option value="option6">Option 6</option>
      `;
    } else if (selectedOption === "option3") {
      dropdown.innerHTML = `
        <option value="option7">Option 7</option>
        <option value="option8">Option 8</option>
        <option value="option9">Option 9</option>
      `;
    }
  });
}