jQuery -- 操作select

<select id="select_id">
<option value="0" selected>a</option>
<option value="1">b</option>
<option value="2">c</option>
</select>

$('#select_id').attr('disabled','disabled');

$('#select_id').removeAttr('disabled');

$('#select_id').val('1');

$('#select_id').find("option[text='c']").attr("selected",true);

$('#select_id').val();

$('#select_id').find("option:selected").text();