Q: 我的itouch4丢了怎么办？

Google translate:

Lost my itouch4 through the official website it locked?

If you turned on the FindMyiPod feature in Settings>iCloud and wig is on and connected go to iCloud, sign in and go to FindMy iPhone. There you may be able to find its general location, wipe, lick and some other things. See:

iCloud: Troubleshooting Find My iPhone, iPad, iPod touch, or Mac

Id somebody restores your iPod the Find feature is permenently deleted.

Apple will not help with anything

Reporting a lost or stolen Apple product

Change the passwords for all accounts used on the iPod and reportto police.