如何使用jquery更改选项

<script src="https://cdn.jsdelivr.net/npm/jquery/dist/jquery.min.js"></script>

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

$("#mySelect").val("option2");

$("#mySelect").append('<option value="option4">Option 4</option>');

$("#mySelect option[value='option3']").remove();