禁用从2个下拉列表中选择的选项||切换选项

<select>
  <option value="option1">选项1</option>
  <option value="option2" disabled>选项2（禁用）</option>
  <option value="option3">选项3</option>
</select>

<select id="select1">
  <option value="option1">选项1</option>
  <option value="option2">选项2</option>
  <option value="option3">选项3</option>
</select>

<select id="select2">
  <option value="option1">选项1</option>
  <option value="option2">选项2</option>
  <option value="option3">选项3</option>
</select>

<script>
  var select1 = document.getElementById("select1");
  var select2 = document.getElementById("select2");

  select1.addEventListener("change", function() {
    if (select1.value === "option1") {
      select2.options[1].setAttribute("disabled", "disabled");
    } else {
      select2.options[1].removeAttribute("disabled");
    }
  });
</script>