Prompt onbeforeunload event when closing the browser_javascript tips

onbeforeunload event This is how it is used:

In this way, every time the browser window is closed or a new page is opened, the onbeforeunload event will be triggered.

The excerpt is as follows: onbeforeunload event:

Note: Firefox and IE among the three major browsers support the onbeforeunload event, but Opera does not yet support it.

Usage:

object.onbeforeunload = handler

Description: When the event is triggered, a dialog box with confirmation and cancellation will pop up. If you confirm, you will leave the page. , cancel to stay on this page. The handler can set a return value as the displayed text of the dialog box.

Triggered by:

Close the browser window

When going to other pages through the address bar or favorites
When clicking Return, Forward, Refresh, or Home Page
When clicking a url link to other pages
When calling any of the following events: click, document write, document open, document close, window close, window navigate, window NavigateAndFind, location replace, location reload, form submit.
When using window open to open a page, And pass the name of the window of this page to the page to be opened.
When reassigning the value of location.href.
When submitting a form with a specified action through the input type="submit" button.
can be used in the following elements: BODY, FRAMESET, window

Platform support: IE4 /Win, Mozilla 1.7a, Netscape 7.2, Firefox0.9