Button actions before js is loaded?

Question

JavaScript

The page loads in 3 seconds, the popup open button is at the beginning, what exactly should be done by clicking on it, if the scripts have not loaded yet?
Just a non-working button does not look very good.

Answer 1

1) open popup from zhs or show button on zhs
2) minify scripts

Answer 2

For example, when you click on a button, it is covered with a cross on a transparent red background, but the overlap fades away after you click it.

Answer 3

Hang a translucent cover with a rotating spinner in the center over the page.