Press "back" button much times to exit the app.

[xiaowl]

jQ.Mobi call history.pushState() everytime a content is loaded. "back" button will trigger "popsate" event when clicked, this event is listened by jQ.Mobi and call $.ui.goBack() immediately.
But, when there is no history entry in $.ui.history, the app should exist. Even there still are entries in window.history.