Why does onbeforeunload event not work - Stack Overflow

Question

Why is the beforeunload event not triggered when the page window is closed? How to solve this?

Answer 1

https://developer.mozilla.org...

The alert in this event will be ignored

Answer 2

For this rare event, it’s best to use jquery to test. If jquery doesn’t support it, it means the compatibility is extremely poor. Let’s change our thinking

Answer 3

Browser compatibility

In IE6, IE7, IE8, it will be executed after refreshing the page, closing the browser, and after page jump;

IE9 will execute page refresh, but page jump and browser closing will not execute;

firefox (including firefox3.6) can be executed after closing the tag, after page jump, and after refreshing the page, but it cannot be executed after closing the browser;

Safari will be executed after refreshing the page and page jump, but it will not be executed after closing the browser;

Opera and Chrome will not be executed under any circumstances.