问无法使令牌替换正常工作

EN

$node = \Drupal\node\Entity\Node::load($nid);  //load the current node
$token_service = \Drupal::token();  //get the Drupal token service which replaces tokens with tokens' data
$body_field_data = $node->get('body')->value;  //get the "text" (basic data) of the body field
$token_data = array(  //assigns the current node data to the 'node' key in the $data array; the node key is recognized by the Token service
  'node' => $node,
);
$token_options = ['clear' => TRUE];  //part of the Token replacement service; A boolean flag indicating that tokens should be removed from the final text if no replacement value can be generated
$params['body'] = $token_service->replace($body_field_data, $token_data, $token_options);  //sets the 'body' key of the $params array equal to the basic body field data plus replaces the tokens in the body field```

function MYMODULE_node_presave(Drupal\Core\Entity\EntityInterface $node) {
  if ($node->bundle() == 'article') {
    $body = $node->get('body')->value;
    $token = Drupal::token();
    $body = $token->replace($body);
    $node->set('body', $body);
  }
}