Open Delete and Send Data window to another page with Javascript

Question

I tried to do it this way, however, I have several records within a repeat loop, the value of the id I can pick up is last on the list. How do I get the value of the record individually.

function confirmacao() {
  var resposta = confirm("Realmente deseja remover esse usuário?");
  if (resposta == true) {
    var url = "teste.php?id=" + "<?php echo $id; ?>";
    window.location.href = url;
  }
}

<div class="modal-footer">
  <div class='col-sm-5 text-right' style="float: right;right: auto;left: 14px;">
    <button type='button' class='btn btn-danger' onclick="confirmacao(this)">Excluir</button>
  </div>
</div>

I got it this way:

function confirmacao(id) {
  var resposta = confirm("Realmente deseja remover este usuário?");

  if (resposta == true) {
    var url = "teste.php?id=" + id;
    window.location.href = url;
  }
}

<div class="modal-footer">
  <div class='col-sm-5 text-right' style="float: right;right: auto;left: 14px;">
    <button type='button' class='btn btn-danger' onclick="confirmacao('<?php print $id; ?>')">Excluir</button>
  </div>
</div>