* init
* number format
* add Countdown
* ⚡ Try something ts stuff
* move out Countdown
* add format
* support countdown
* add prefix & suffix
* Move Number to Statistic
* adjust ts
* clean up
* roll back of lodash
* update doc & style
* variable of the less style
* add demo test
* full coverage
* hide title if not need
* update snapshot
* update accessiblity
* update color
* stop countdown when time is out
* formatTimeStr adjust
* use reset class
* add miss tab index
* update doc
* update title prop & snapshot
* rm additional aria. It's over design
* use card sample on unit demo
* sfc
* adjust demo
