Front-end login and registration are usually implemented using HTML forms and JavaScript. After the user enters the username and password on the login page, clicks the Submit button to trigger the JavaScript function to verify the input information and send a request to the back end. The back end verifies the information and returns the corresponding status code or token to the front end to save the login status on the front end.

The registration function is for the user to fill in the relevant information, click the Submit button, and use JavaScript to verify the legitimacy of the information and send a registration request to the back end. The back end receives the request and completes the registration operation. The entire process implements the user's login and registration functions through the interaction between the front end and the back end.