Case preparation

page ：

JS：

When the client sends the request , If url The second content path of the path request line is /server, Will execute the code in the callback function , And by the response To respond to

function ：

View it in a browser ：

Enter in the address bar `127.0.0.1:8000/server, Remember this server Namely js On the ninth line of the file server. If it doesn't correspond, it can't be opened , Will report a mistake . I made a mistake , I wrote sever Ooh, ooh, ooh ┭┮﹏┭┮
Then open it like this