javascript – Confirrm box when the exit button is clicked. I want some action to happen when the user press confirm

I am doing some code and trying to do some actions after the user press the exit button, but i cant seem to make it work.

I want when the user press teh exit button, a confirm box to appear and then an action should happen if they press cancel or confirm

This is my code:

window.onbeforeunload = function () {

const leavePage = confirm("some message");
if (leavePage) {
} else {


If the confirm dont work on onbeforeunload, what can i do to make what i want to work?

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