IPhone 4 teach you completely close the application!

See a lot of new players is it isa problem, so I wrote this article to help all of you! Methods: Double-click the " home " after they run in the background icon appears, then the fingers holding down the icon, and then the icon will jitter, while the upper left corner of each icon in red "-" minus sign, click the red "-" minus sign, the program is closed it!