How to trigger an editor button click event in TinyMCE?

Question

JavaScript

Good afternoon. Next question.
There is wysiwyg TinyMCE. When loading the page, it is necessary to check the text using spellchecker (Now you have to press the spellchecker button for each form with your hands).
How can I manually trigger a button press event in the spellchecker editor?
I looked at the documentation, it seems like there is something like window.tinymce.execCommand('mceSpellCheck');But this command returns false, ala is not executed.
Tell me, what are the ways? Thank you very much in advance!