Solution to similar message prompts

The message prompts are similar functions, that is, when the page is opened, you can query whether the server has new messages. If yes, there is a "new message" icon in the upper-right corner of the information bar in the navigation bar for prompt. I have never done it before. I can help you with your ideas, I don't need to query the database on A regular basis. I don't need A message like A function.
This is probably the result. when you open the page, you can check whether there are new messages on the server. If yes, a "new message" icon is displayed in the upper-right corner of the information bar in the navigation bar, which has never been done before, I know how to help guide the train of thought. what technology does it use outside of php? do I need to query the database regularly without Ajax? Or wherever you can learn, thank you!

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... In this case. You can create a. iframe for the information prompt box. Use the page refresh function in iframe. No need for ajax