jq获取select控件的selected属性值

<select>
  <option value ="3">请选择</option>
  <option value ="0">场内申报</option>
  <option value ="1">场外申报</option>
</select>
if(res.data.type == 0){
  $("select option[value='0']").attr("selected",true);
  $(".intra-field").html('场内');
}else{
  $("select option[value='1']").attr("selected",true);
  $(".intra-field").html('场外');
}
$("select optionvalue='xx']").attr("selected",true);