JS获取DropDownList的value与text值

<asp:DropDownList ID="DropDownList1" runat="server" onchange="SearchChange();">

    <asp:ListItem Value="0">111</asp:ListItem>

    <asp:ListItem Value="1">222</asp:ListItem>

    <asp:ListItem Value="2">333</asp:ListItem>

</asp:DropDownList>

<script type="text/javascript" language="javascript">

    function SearchChange()

    {

        var ddl = document.getElementById("DropDownList1")  

        var index = ddl.selectedIndex;  

           

        var Value = ddl.options[index].value;  

        var Text = ddl.options[index].text;

       

        alert(Value);

    }

    </script>