What happens after react calls setstate
What happens after react calls setstate: 1. Merge the incoming parameter object with the current state of the component to trigger the reconciliation process; 2. Build the React element tree based on the new state and re-render the entire UI interface; 3. , after getting the element tree, React will calculate the node difference between the new tree and the old tree, and then minimize and re-render.
The operating environment of this tutorial: Windows 10 system, react17.0.1 version, Dell G3 computer.
What happened after react called setstate
React designed the setState method to re-render the page
Two ways to write setState() to update the state
setState(updater, [callback]), updater is a function that returns a stateChange object: (state, props) => stateChange The state and props received by stateChange are guaranteed to be the latest
setState(stateChange , [callback]), stateChange is an object, callback is an optional callback function, which is executed after the status is updated and the interface is updated.
Summary: The object method is the abbreviation of the function method if the new state does not depend on the original State ===> Use the object method if the new state depends on the original state ===> Use the function method if you need to get the latest state data after setState(), read it in the second callback function
What happens after calling setState?
After calling the setState function in the code, React will merge the passed parameter object with the current state of the component, and then trigger the so-called reconciliation process (Reconciliation).
After the reconciliation process, React will build the React element tree based on the new state in a relatively efficient way and proceed to re-render the entire UI interface.
After React obtains the element tree, React will automatically calculate the node difference between the new tree and the old tree, and then minimize and re-render the interface based on the difference.
In the difference calculation algorithm, React can relatively accurately know which positions have changed and how they should be changed, which ensures on-demand updates instead of full re-rendering.
Recommended learning: "react video tutorial"
The above is the detailed content of What happens after react calls setstate. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

How to build a real-time chat application using React and WebSocket Introduction: With the rapid development of the Internet, real-time communication has attracted more and more attention. Live chat apps have become an integral part of modern social and work life. This article will introduce how to build a simple real-time chat application using React and WebSocket, and provide specific code examples. 1. Technical preparation Before starting to build a real-time chat application, we need to prepare the following technologies and tools: React: one for building

React front-end and back-end separation guide: How to achieve front-end and back-end decoupling and independent deployment, specific code examples are required In today's web development environment, front-end and back-end separation has become a trend. By separating front-end and back-end code, development work can be made more flexible, efficient, and facilitate team collaboration. This article will introduce how to use React to achieve front-end and back-end separation, thereby achieving the goals of decoupling and independent deployment. First, we need to understand what front-end and back-end separation is. In the traditional web development model, the front-end and back-end are coupled

How to use React and Flask to build simple and easy-to-use web applications Introduction: With the development of the Internet, the needs of web applications are becoming more and more diverse and complex. In order to meet user requirements for ease of use and performance, it is becoming increasingly important to use modern technology stacks to build network applications. React and Flask are two very popular frameworks for front-end and back-end development, and they work well together to build simple and easy-to-use web applications. This article will detail how to leverage React and Flask

How to build a reliable messaging application with React and RabbitMQ Introduction: Modern applications need to support reliable messaging to achieve features such as real-time updates and data synchronization. React is a popular JavaScript library for building user interfaces, while RabbitMQ is a reliable messaging middleware. This article will introduce how to combine React and RabbitMQ to build a reliable messaging application, and provide specific code examples. RabbitMQ overview:

How to use React and Google BigQuery to build fast data analysis applications Introduction: In today's era of information explosion, data analysis has become an indispensable link in various industries. Among them, building fast and efficient data analysis applications has become the goal pursued by many companies and individuals. This article will introduce how to use React and Google BigQuery to build a fast data analysis application, and provide detailed code examples. 1. Overview React is a tool for building

React code debugging guide: How to quickly locate and resolve front-end bugs Introduction: When developing React applications, you often encounter a variety of bugs that may crash the application or cause incorrect behavior. Therefore, mastering debugging skills is an essential ability for every React developer. This article will introduce some practical techniques for locating and solving front-end bugs, and provide specific code examples to help readers quickly locate and solve bugs in React applications. 1. Selection of debugging tools: In Re

ReactRouter User Guide: How to Implement Front-End Routing Control With the popularity of single-page applications, front-end routing has become an important part that cannot be ignored. As the most popular routing library in the React ecosystem, ReactRouter provides rich functions and easy-to-use APIs, making the implementation of front-end routing very simple and flexible. This article will introduce how to use ReactRouter and provide some specific code examples. To install ReactRouter first, we need

React Responsive Design Guide: How to Achieve Adaptive Front-end Layout Effects With the popularity of mobile devices and the increasing user demand for multi-screen experiences, responsive design has become one of the important considerations in modern front-end development. React, as one of the most popular front-end frameworks at present, provides a wealth of tools and components to help developers achieve adaptive layout effects. This article will share some guidelines and tips on implementing responsive design using React, and provide specific code examples for reference. Fle using React
