What is the real-time web page? is there any good idea?

How does the webpage instantly work? is there any good idea? Such as Question, instant? Timing ., Pinyin input method is the culprit. js. Is it true that the author wants to determine the user's stay time on this page ?, Ajax is not a new method, but there will still be Latency. it doesn't matter if you are updating a few content. If you want to chat and so on, you need to respond in a timely manner. Which of the following is how to adjust the instant webpage? is there any good idea?
Example

------ Solution --------------------
Instant? Timing.
------ Solution --------------------
Pinyin input method is the culprit.
Js.
------ Solution --------------------
Is it true that the owner wants to determine the user's stay time on this page?
------ Solution --------------------
Ajax is not a new method, but there will still be Latency. it doesn't matter if you are updating a few content. If you want to chat and so on, you need to respond in a timely manner, which call frequency will be high, and the server speed will keep up.
------ Solution --------------------
Discussion

Ajax is not a new method, but there will still be Latency. it doesn't matter if you are updating a few content. If you want to chat and so on, you need to respond in a timely manner, which call frequency will be high, and the server speed will keep up.

------ Solution --------------------
Search on the network: ajax, round robin, Comet
Probably have the answer you want