如果可以使用 Passport Js 您将节点js用作后端，或者可以使用 Auth0 之类的服务，这是针对多个Oauth的一步解决方案.>

I am looking for API and Example that can help me to build two-factor authentication of my website for the server as well as the front side. I want to build something like this, http://ngtfaweb.azurewebsites.net/#/home

You could use Passport Js if you are using node js as backend or you could use services like Auth0 which are one step solution for multiple Oauth.