问题
Looking at http://docs.aws.amazon.com/cognito/latest/developerguide/facebook.html there is an example of how to code up a login using AWS Cognito + Facebook.
However, I’m unable to find examples of a logout flow. Because of the 3 parties interacting, including browser-side caching, and potentially asynchronous operations involved, it would be good to be aware of any gotchas or recommendations.
So: what’s a good way of handling logout after logging in with AWS Cognito + Facebook?
来源：https://stackoverflow.com/questions/46514605/aws-cognito-federated-identity-facebook-suggested-logout-flow