AJAX | 使用alert（）; 其他文件中的函数不起作用

Question

I'm working on Ajax and still learning to use it properly. I'm wondering why in one side of Ajax alert(); works but on the other side - no.

It's pretty basic code:

$('.naudoti_papildus_visiems').click(function() {
    var n;                  

    $.post('/ajax/naudoti_papildus_visiems.php', { status : 1, fermos_id : '<?php echo $id_kurat; ?>', gyvulio_tipas : '<?php echo $type_zagon; ?>' },
    function(data) {
        var typeclick = data.typeclick,
            typeu = data.typeu,
            stil = data.stil,
            stildell = data.stildell;

        $.noty.closeAll();
        if (n) {
            n.setText('<b>' + data.message + '</b>');
            n.setType(typeu);
        } else {
            n = noty({
                text: '<b>' + data.message + '</b>',

                type: typeu,
                dismissQueue: false,
                layout: 'top',
                theme: 'defaultTheme',
                timeout: 3000,
            });
        }
    }, 'json');
});

"naudoti_papildus_visiems.php" content:

<script>alert(9);</script>

I've tested one thing: using alert(); function inside an Ajax, it works:

$('.naudoti_papildus_visiems').click(function() {
var n;                  

$.post('/ajax/naudoti_papildus_visiems.php', { status : 1, fermos_id : '<?php echo $id_kurat; ?>', gyvulio_tipas : '<?php echo $type_zagon; ?>' },
function(data) {
    var typeclick = data.typeclick,
        typeu = data.typeu,
        stil = data.stil,
        stildell = data.stildell;

    alert(9); // works

    $.noty.closeAll();
    if (n) {
        n.setText('<b>' + data.message + '</b>');
        n.setType(typeu);
    } else {
        n = noty({
            text: '<b>' + data.message + '</b>',

            type: typeu,
            dismissQueue: false,
            layout: 'top',
            theme: 'defaultTheme',
            timeout: 3000,
        });
    }
}, 'json');
});

Chrome console doesn't show any errors. Any help would be appreciated.

loelsonk: still doesn't work. Am I doing something wrong?

    $('.naudoti_papildus_visiems').click(function() {
    var n;                  

$.ajax({
  url: '/ajax/naudoti_papildus_visiems.php',
  type: 'POST',
  dataType : 'json',
  data: { status : 1, fermos_id : '<?php echo $id_kurat; ?>', gyvulio_tipas : '<?php echo $type_zagon; ?>' },
  success: function(data) {
        var typeclick = data.typeclick,
            typeu = data.typeu,
            stil = data.stil,
            stildell = data.stildell;

        $.noty.closeAll();
        if (n) {
            n.setText('<b>' + data.message + '</b>');
            n.setType(typeu);
        } else {
            n = noty({
                text: '<b>' + data.message + '</b>',

                type: typeu,
                dismissQueue: false,
                layout: 'top',
                theme: 'defaultTheme',
                timeout: 3000,
            });
        }

        $('#data').html(data);
    }
});
});