这是强迫症，得改，完全没必要这么去做

这个列表只是当成最近使用程序的一个快捷方式而已，老想着安卓杀进程那一套可不好。。。

Let me wrap this up by giving you a quick summary:

If someone tells you that all the apps in the multitasking bar are running, using up memory or sucking power, they are wrong.
When you hit the home button, an app moves from Active to Background and quickly to the Suspended state where it no longer uses CPU time or drains power.
An app may request an additional 10 minutes of Background running to complete a big task before becoming Suspended.
If memory is becoming scarce, iOS will automatically move Suspended apps into the Not Running state and reclaim their memory.
Five classes of apps - audio, GPS, VOIP, Newsstand and accessory apps - and some built-in apps such as Mail may run indefinitely in the background until they complete their task.
Put simply: you do not have to manage background tasks on iOS. The system handles almost every case for you and well written audio, GPS, VOIP, Newsstand and accessory apps will handle the rest.