Ajax：功能不起作用

Question

I don't know why my code does not work onclick, but there is no pop up. The AJAX function var phone and id got data, but the AJAX did not. Is there anything wrong with the script? Does the AJAX need a jQuery library?

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/core.js"></script>
<script type="text/javascript">
  function clickButton() {
    var phone = document.getElementById('phone').value;
    var id = document.getElementById('id').value;
    $.ajax({
      type: "post",
      url: "userDetaiAjax.php",
      data: {
        'phone': phone,
        'id': id
      },
      cache: false,
      success: function(html) {
        alert('Data Send');
        $('#msg').html(html);
      }
    });
    return false;
  }
</script>
<div class="col">
  <div class="form-group">
      <h6>
        <label>Name :</label>
        <?php echo $name ?>
      </h6>
      <h6>
        <label>Email :</label>
        <?php echo $email ?>
      </h6>
      <input type="" name="phone" id="phone">
      <input type="" name="id" id="id" value="<?php echo $_SESSION[" staff_id "];?>" hidden>
      <h6>
        <label>Phone :</label>
        <?php echo $phone ?>
      </h6>
      <input type="submit" name="aa" value="submit2" onclick="return clickButton();">
    </form>
    <p id="msg"></p>
  </div>
</div>
</div>
</div>

for the url

<?php 
$phone = $_POST['phone'];
$id = $_POST['id'];
echo 'success';
echo $phone;
echo $id;

$a='"USR_ID"';
$b='"phone"';
include 'conn.php';
if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);

}

   $query = "update usr_web SET phone=:c1 WHERE usr_id=:c2";

              $stid = oci_parse($conn, $query);

   oci_bind_by_name($stid, ":c1", $phone);
   oci_bind_by_name($stid, ":c2", $id);


                                 $result = oci_execute($stid);
                                 oci_free_statement($stid);
                                 oci_commit($conn);
                                  oci_close($conn);
                            echo $result;

?>