How does Apple 6 close the background program in iOS 1 1?

Take the iPhone6 as an example. iOS 1 1 closes the background program. The specific operation steps are as follows:

1. First, find the application "Settings" icon option on the mobile phone desktop, select it and click it, as shown below.

2. Next, in the setting interface, drop down to find the general options, and click Open, as shown in the figure below.

3. Then enter the normal operation interface, find the "background application refresh" option, and click Open, as shown in the following figure.

4. Finally, refresh the interface in the background application, find the application that needs to be closed in the background, and then click Close, as shown in the following figure.