<input type="text" id="keyword"> <select id="choice"> <option value="A" selected>전체</option> <option value="N">이름</option> <option value="E">나이</option> </select>
$('#keyword').val(" 변경할 값 ");
$('#state').val('E').prop("selected", true);
참고문서 https://devmoony.tistory.com/79