What is the principle behind React’s data responsivenes…

The data response mechanism of React is achieved through the use of Virtual DOM and the diff algorithm.

React utilizes a virtual DOM to represent the latest UI state when data changes. The virtual DOM is a lightweight JavaScript object that serves as an abstract representation of the actual DOM. By comparing the differences between the previous and current virtual DOM, React identifies the parts that need to be updated and applies these changes to the real DOM, thereby updating the UI.

React uses virtual DOM to avoid the performance issues that come with directly manipulating the actual DOM. The virtual DOM consolidates all DOM manipulations and updates the real DOM all at once, reducing the number of DOM operations and improving performance.

Data response is achieved through React’s componentization mechanism. In React, the UI is divided into individual components, each with its own state and properties. When a component’s state or properties change, React automatically calls the component’s render method to re-render the UI, updating both the virtual DOM and the real DOM.

React also offers a way to implement data responsiveness called Controlled Components. Controlled Components refer to components whose state is controlled by external data. When the external data changes, the component automatically updates the UI. By binding the component’s state to external data, two-way data binding is achieved, ensuring that the UI stays in sync with the data.

In summary, React’s data response mechanism is implemented using virtual DOM and diff algorithm, dividing the UI into independent components, updating the UI by comparing the differences between the previous and current virtual DOM, and enabling data two-way binding through controlled components. This approach improves performance and keeps the UI synchronized with the data.