Hi Dawen Xie,
Welcome to GeoNet. The community is there to help.
What exactly is your question? I have seen members of ESRI's ArcGIS API for Javascript team around on this forum, so the the best thing you could do is post your issue here. In this way they will be able to help. And maybe other community members can also shed their light on your question.
HTH,
Egge-Jan