Clear memory variable data

I have a function that through click detection makes a post to act.php act calls a php function that inserts the comments.

Everything works, massssssssssss, as it does not have refresh on the page and the intention is this same, when I insert a second comment the code is executed, 1 + 2 times, if it is to enter a third, it is executed 1 + 3 times, has to "clear from memory" the data already sent, because it is running several times the same code, just to refresh the page.

jQuery:

$("#btnanotacao").click(function() {
    d = new Date;
    idcli = $("#idclientecoment").val();
    anot = $("#fanotacao").val();
    dat = d.getFullYear() + '-' + d.getMonth() + '-' + d.getDate();
    jQuery.ajax({
        type: "POST",
        url: "lib/act.php",
        data: {
            acao: 'coment',
            idclie: idcli,
            anotacao: anot,
            dt: dat
        },
        success: function(data) {
            var a;
            a = parseInt(data);
            if (a != 1) {
                alert(data);
            } else {
                alert("Comentario Inseridos com Sucesso");
            }
        }
    })
    return false;
});

HTML:

<textarea class="form-control" id="fanotacao" rows="6" placeholder="Digite aqui alguma anotação que julgar útil."></textarea>
<input type="hidden" id="idclientecoment" value="<?php echo $id; ?>">
<button type="button" id="btnanotacao" class="btn btn-primary btn-block mt-sm">Save</button>

PHP:

if(isset($_POST['acao']) && $_POST['acao']== 'coment'){
$comentarios        = array(
    'idcli'             => $idclie,
    'data'              => $dt,
    'comentario'        => $anotacao
);
$query = DBCreate('comentarios', $comentarios);
    if($query)
        echo "1";
    else{
        echo "0";
    }
}