自任何属性添加到<br> 标记，包括类名和data-attrs防止剥离，快速且不完整的方法可能是：

function filter_function_name( $content, $post_id ) {

  $content = str_replace(\'<br>\', \'<br data-x>\',   $content);
  $content = str_replace(\'<br >\', \'<br data-x>\',  $content);
  $content = str_replace(\'<br />\', \'<br data-x>\', $content);
  $content = str_replace(\'<br/>\', \'<br data-x>\',  $content);

  return $content;
}
add_filter( \'content_edit_pre\', \'filter_function_name\', 10, 2 );