<select name="corporation"> <option value="1">corporation1</option> <option value="2">corporation2</option> <option value="3">corporation3</option> </select>
$("[name='corporation']").val(3); //选中corporation3
<select name="corporation"> <option value="1">corporation1</option> <option value="2">corporation2</option> <option value="3">corporation3</option> </select>
$("[name='corporation']").val(3); //选中corporation3