$(document).ready(function () {
    $("N2_ID").change(function () {
        alert($('#N2_ID option:selected').text());
        var n2_id = $("#N2_ID").val();
        alert(n2_id);

        $.ajax({
            url: "/Node/GetJudgeN2_ID?nid=" + n2_id,
            type: 'POST',
            dataType: 'json',
            data: null,
            contentType: 'application/json; charset=utf-8',
            success: function (data) {
                if (data == true) {
                    alert("成功！");

                }
                else {
                    alert("操作数据库出错，失败！");

                }

            }, error: function () {
                alert("出错了，失败！");
            }
        });
    }); debugger;
});