HTML选择不能声明选定的选项

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

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

<script>
  // 根据条件动态选中默认选项
  var mySelect = document.getElementById("mySelect");
  var condition = true; // 根据实际条件设置
  if (condition) {
    mySelect.value = "option2"; // 设置默认选中的值
  }
</script>