how to show alert when user tries to close browser code example

Example: on window close give alert javascript

let disableConfirmation = false;
window.addEventListener('beforeunload', event => {
  const confirmationText = 'Are you sure?';
  if (!disableConfirmation) {
    event.returnValue = confirmationText; // Gecko, Trident, Chrome 34+
    return confirmationText;              // Gecko, WebKit, Chrome <34
  } else {
    // Set flag back to false, just in case
    // user stops loading page after clicking a link.
    disableConfirmation = false;
  }
});

After Confimation if you want to send any ajax request and you have used jquery
 $(window).on('unload', function() {
   // async: false will make the AJAX synchronous in case you're using jQuery
   axios
     .get('ajax_url')
     .then(response => {});
 });

And if no jquery is used you can use navigator, it require navigator library

navigator.sendBeacon(url, data);