SPA adopts the way of separating the front end and the back end. The front-end is responsible for handling user interaction and presenting data, while the back-end is responsible for providing data interfaces and processing business logic. This separate architecture enables front-end and back-end development to be carried out in parallel, which has higher flexibility. Because the page only needs to be loaded once, there will be no page refresh during the user operation, which greatly improves the user experience.
SPA uses Ajax (asynchronous JavaScript and XML) technology to load data asynchronously. Through asynchronous communication with the back end, only the parts that need to be modified are updated instead of reloading the whole page. This can reduce network transmission and save the resource consumption of server and client.
SPA also uses routing mechanism to manage jumps and state switching between pages. By monitoring the change of URL and realizing the routing function in the front end, the content of the page can be changed dynamically without requesting a new HTML file. In this way, you can switch pages without refreshing, and it is convenient to go forward and backward.
SPA also has good maintainability and expansibility. Due to the separation of front-end and back-end, the front-end code can be more modular and easy to maintain and modify. Because we only need to pay attention to the front-end logic and interface display, the back-end can be flexibly changed and expanded as needed.
SPA is a web application architecture mode, which adopts front-end separation, asynchronous data loading and no refresh to switch pages. By providing a smooth and fast user experience, it optimizes the shortcomings of traditional multi-page applications and has good maintainability and expansibility.