Calling a js function on a page from an extension?

Question

JavaScript

Good time, the question is the following, how can I call a js function on the current page from the chrome extension
Let's say there is a function on the page that does something, and I would like to call it from the extension and get the result of its work and then operate with its results inside the extension

Answer 1

location.href = 'javascript:alert(1)';