Are all WeChat applets logged in by scanning code?

Here, you need to scan the code to open the WeChat applet, then there is a button to scan the code to log in to the applet, and then scan the QR code on the right to log in.

realization principle

1. Open the website to generate a QR code with parameters;

2. Scan the QR code just generated after opening the WeChat applet;

3. The applet sends the openID of the WeChat user and the parameters on the QR code to the background. At this point, if there are no users in the background, users will be created and openID and parameters will be updated. If there is user information, you can directly update the parameters on the QR code.

4. Open the website page to poll the background data to see if there is an updated QR code.

5. If the parameters of the QR code are in the background data, the login is successful.

6. If there is no polling data within a certain period of time, the polling will end and the user will be prompted to operate again.