jquery问题

求各位大佬指点，就是我想触发之后，只执行一次，问题出在jQuery的循环上，这是个web form项目。现在是点击1，就跳出GridView当中第一行第一列的值，但是我选择多个时，输出的值会重复。我不需要button来触发这个事件
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <link rel="stylesheet" type="text/css" href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" />
    <script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
    <link rel="stylesheet" type="text/css" href="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/css/bootstrap-multiselect.css" />
    <script type="text/javascript" src="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/js/bootstrap-multiselect.js"></script>
     <script>
        $(function () {
            $('#ListView1').multiselect({ includeSelectAllOption: true });
            var value = [];            $("#ListView1").change(function () {
                $("input:checked").each(function () {
                    
                    value.push($(this).val())                  
                });
                for (var i = 0; i < value.length; i++) {
                    var t1 = $('#GridView1 tr').eq(value[i]).find("td:first").text();
                    console.log(t1)
                }
            });        });     </script>
<form id="form1" runat="server">
        <div>
            <asp:GridView ID="GridView1" runat="server"></asp:GridView>
            <asp:ListBox ID="ListView1" runat="server" SelectionMode="Multiple">               
                <asp:ListItem Value="1"></asp:ListItem>
                <asp:ListItem Value="2"></asp:ListItem>
                <asp:ListItem Value="3"></asp:ListItem>
            </asp:ListBox>                             
        </div>
    </form>
protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DataTable dt = new DataTable();
                dt.Columns.AddRange(new DataColumn[2] {  new DataColumn("Name"), new DataColumn("Country") });
                dt.Rows.Add("name1", "country1");
                dt.Rows.Add("name2", "country2");
                dt.Rows.Add( "name3", "country3");
            
                GridView1.DataSource = dt;
                GridView1.DataBind();
            }
        }