fixed bugs

Change-Id: I3a7bb81853236d6d4c777a7fa75e5226e350f348
Merge branch 'master' of https://github.com/Hahn-/GdutExchange.git

Conflicts:
	Public/js/admin/usermanage.js

Change-Id: Iccfc847e4e2de063d708cef1b15eb95b928cc066