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MVVM (Model-View-ViewModel) and MVC (Model-View-Controller) are two common front-end architecture patterns, both of which are designed to help organize and manage complex front-end application logic and view layers.

MVC（Model-View-Controller）

1. principle：

   • Model: Represents the data structure and business logic of the application. The model obtains data by communicating with the database.
   • View: Responsible for presenting the model's data to the user, receiving user input, and then passing the user input to the controller for processing.
   • Controller: Process user input (e.g. clicks, typing, etc.), update the model based on the input, and optionally update the view to the new model state.

2. the difference：

   • Clear division of labor: The controller in MVC is responsible for processing user input and state changes, updating the model, and notifying the view to update. The view is only responsible for displaying data. The model is the data manager of the application.
   • Traditional Web Applications: MVC was originally designed for traditional Web application development, but with the rise of front-end frameworks and single-page applications, MVVM has gradually become popular.

MVVM（Model-View-ViewModel）

1. principle：

   • Model: Same as the model in MVC, representing the data and business logic of the application.
   • View: The structure and layout of the user interface, responsible for rendering the data bound to the view model to the user interface.
   • ViewModel: Middleware that connects views and models, manages the state and behavior of views, handles user interactions, and updates model data as needed.

2. the difference：

   • Data Binding: In MVVM, the view and view model are automatically synchronized through data binding, and the view model does not need to explicitly control the update of the view.
   • Front-end framework: MVVM is more suitable for modern front-end frameworks (such as Vue.js, React, etc.), which provide functions such as data binding and virtual DOM, which can manage complex user interfaces more efficiently.

To summarize the differences:

• MVCEmphasize the role of the controller, which is responsible for processing user input and application logic, the view is responsible for display, and the model is responsible for data management.
• MVVMIt focuses more on data-driven view changes, handles user interaction and view state through the view model, and the model is responsible for business logic and data management.

When choosing to use MVC or MVVM, you can decide based on the project requirements, the team's familiarity, and the support of the front-end framework.