Update channelService.js
Merge pull request #622 from keqinzhao/patch-2

bugfix: wrong scope for this
Update appUtil.js

之前使用git不熟練，關掉上個重新提交了一份
paseInt會把有些特定的字符串如"0123abcd"轉換成數字，所以這存在bug
Merge pull request #623 from jiangzhuo/patch-1

fix bug on arg parse, change parseInt to Number()