What is the page refresh mechanism for javascript message push?

Question

If a long socket connection is used for message push, is a connection established after each page is opened? Is there anyone who can give me the answer

Answer 1

Purposesocket.io
你打开网页的时候用dev-tools就可以看到网络中有类似这样的请求
wss://segmentfault.com:7001/socket.io/?EIO=3&transport=websocket&sid=8r6PgQTb-KLvxevHDkEp

Answer 2

https://socket.io/