After I deploy an Azure Web function, the corresponding function is not generated in the interface

I want to make a chat room. I follow the step with MS tutorial.
My folder is like figure1.

But the function doesn’t be create. When I go to azure portal, I saw the Function app is created successfully, but their is no any function can be trig (fig2).

I use function start locally and it works fine, but I put it in azure and it doesn’t work.