Warn the user if leave the current page using javascript

In some situations, users have a chance to wrongly press the back, close or reload button in the browser, if we want to show any warning message we can use the onbeforeunload event.

Example

    window.onbeforeunload = function() { 

        return "Are you sure to go back?"; 

    };

Example Program:- (Editor)

The editor is Loading...

Output:-

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