How to send texrarea content with ajax?

Question

CKEditor

Editor initialization:

spoiler

ClassicEditor.create( document.querySelector('#add-page-content') )
  .then( editor => {console.log( editor );} )
  .catch( error => {console.error( error );} );

AJAX submission:

spoiler

var pageContent = $("#add-page-content").text();
$.post(url,'&method=pageСreate&pageName=1&pageContent='+pageContent,function(data) {
  data = JSON.parse(data);
  if (data['status'] == 1){
    alert('Страница успешно создана!');
  }else{
    alert('Произошла ошибка');
  }
});

PHP processing:

spoiler

if( $data['method']=='pageСreate' ){
  $pageContent = $data['pageContent'];
  $savePage = file_put_contents("1.html", $pageContent);
  if( $savePage ){
    echo json_encode(array('status' => '1'));exit();
  }else{echo json_encode(array('status' => '0'));exit();}				
}

As a result, an empty 1.html is created.
How to correctly transfer data from CKEditor 5?