The company's development model is front-end cutting and PHP pages. I have been cutting pictures for several months. After work, I have been recharging myself intermittently (after all, I became a monk halfway). I also came into contact with the separation of front-end and back-end. , vue.js and other things. At this time, I thought of a problem. After the current backend is separated and the user logs in, the backend must give the frontend a specific key value (let’s call it that for the time being, because I don’t have a specific concept) To determine a specific user, so as to provide different interfaces for different users. So where should the front-end store the key value reasonably?

If you are in a good mood, you can answer it in detail. If you are too lazy to explain, you can give me a few keywords and I will try to search them myself. Thank you