Composition API is a new way of organizing component logic introduced by Vue 3. Based on the idea of functional programming, it splits the logic of components into smaller functional modules, making the code more maintainable and reusable.
Using the Composition API, we can encapsulate related logic codes according to functions, rather than according to options (such as data, methods, computed, etc.). This can make the code more focused and clear, and it is easier to reuse logic code.
The Composition API realizes the logic writing of components by providing a series of functions (such as reactive, ref, watch, etc.) and hook functions (such as setup, onMounted, etc.). Among them, the reactive function is used to create responsive data, the ref function is used to create a single responsive data, the watch function is used to monitor changes in responsive data, and the setup function is used to initialize components, etc.
Compared with Vue 2's Options API, Composition API has the following advantages:
- More flexible: It is easier to organize and reuse component logic, improving code maintainability and readability.
- Better TypeScript support: The Composition API supports TypeScript better, providing more accurate type derivation and type checking.
- Better IDE support: The IDE can better recognize and prompt functions and logical relationships in the Composition API.
- Better performance: The Composition API has been optimized for performance, rendering and updating more efficiently.
In short, Composition API is a more flexible and powerful way to organize component logic in Vue 3, which can help developers better build and maintain Vue applications.