How to stop form submission in JS?

Question

JavaScript

The bottom line is, there is a regular form with an action that is generated on js and then submits from it. How to stop sending it after submit?
var $f = $('#' + formId);
$f.submit()

Answer 1

$f.on('submit', function(e) {
  e.preventDefault();
});

Answer 2

Not suitable. I need a solution when the action has already worked, but the browser has not had time to reload the page.