Frontend Refactoring

[WenlinMao]

Is your feature request related to a problem? Please describe.
Code in frontend need comment in each method and delete many useless code

Describe the solution you'd like
Refactoring react code based on LGTM alter.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.