jquery下的select dropdownlist用法总结（待续）

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <script src="Scripts/jquery-1.10.2.js" type="text/javascript"></script>
    <title></title>
</head>

<body>
    <script type="text/javascript" >
        function test() {
          // var test = " a bc ";
          // //$("#d3").val(test);
          //test= test.trim();
            // alert("我是测试空格的-"+test+"-");

//$('select#ddlTest')[0].selectedIndex = -1;//测试过，有效。
//$('select#ddlTest').selectedIndex = -1;//测试，无效。

            //var selecttext = $('select#ddlTest').find('option:selected').val();//测试通过
            //var va2 = $('select#ddlTest').selectedValue; 获取value的错误用法
            //var va2= $("select#ddlTest option[" + 3 + "]").text();//错误用法

            //var va2 = $("select#ddlTest").get(0).options[3].text;//正确用法
            //var va2 = $("select#ddlTest")[0].options[3].text;//正确用法
            //var va2 = $("select#ddlTest")[0].options[3].value;//+"--"+
            //var va2= $("select#ddlTest")[0].options[3].val();//错误用法
            //var va2 = $('select#ddlTest')[0].options.length;//正确用法
            //var va2 = $('select#ddlTest').length;//正确用法这个用法结果不正确，不管list列多少，只有1
            //var va2 = $('select#ddlTest')[0].length;//正确用法
            //var va2 = $('select#ddlTest')[0].options.length + "-" + $('select#ddlTest').length;

alert(va2);//[0]
}

    </script>
    <form id="form1" runat="server">

        <div class="col-md-4">
            <h2>Getting </h2>
            页面测试获取后台参数<input value="<%=TestValue %>" />
           <br />
                测试值2<input   value="<%=treeview_num %>" />
          <br />
            <input value=" a bc " id="d3" />
            <br />

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