Capture browser events

How can i capture the browser events like '开发者_如何学Cwindow close', 'back button pressed' using javascript or any other client script.

Is there a way to capture the events when clicked outside the document.

The unload and beforeunload events will fire when the window is closed or the back button is pressed, but they will also fire for any type of navigation away from the current page.

You can't capture events outside the context of your web page.