jQuery取得select選擇的文字與值

jquery獲取select選擇的文字與值
獲取select ：
獲取select 選中的 text :
    $("#ddlregtype").find("option:selected").text();

獲取select選中的 value:
    $("#ddlregtype ").val();

獲取select選中的索引:
    $("#ddlregtype ").get(0).selectedindex;

設定select:
設定select 選中的索引：
    $("#ddlregtype ").get(0).selectedindex=index;//index為索引值

設定select 選中的value：
    $("#ddlregtype ").attr("value","normal“);
    $("#ddlregtype ").val("normal");
    $("#ddlregtype ").get(0).value = value;

設定select 選中的text:

    var count=$("#ddlregtype option").length;
      for(var i=0;i<count;i++)
         {           if($("#ddlregtype ").get(0).options[i].text == text)
            {
                $("#ddlregtype ").get(0).options[i].selected = true;
                break;
            }
        }
    $("#select_id option[text='jquery']").attr("selected", true);

設定select option項:

    $("#select_id").append("<option value='value'>text</option>");  //新增一項option
    $("#select_id").prepend("<option value='0'>請選擇</option>"); //在前面插入一項option
    $("#select_id option:last").remove(); //刪除索引值最大的option
    $("#select_id option[index='0']").remove();//刪除索引值為0的option
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