React FAQ: Setting Up, Installing, User Events & Best Practices

This article answers nine common questions in the introductory stage of React.

Core points

• Essential skills: Solid HTML, CSS, JavaScript (ES6) foundation, understanding DOM (document object model), and familiar with Node.js and npm (Node package manager). Getting started requires a modern browser, a code editor, and Node.js and npm installed on your computer.
• Core concepts: Components, states and properties, JSX, lifecycle methods and event processing. Components are the cornerstone of React applications, state and attribute management data. JSX allows writing HTML-like code in JavaScript, lifecycle methods are called at specific points in the component DOM lifecycle, and event processing manages user interaction.
• Best Practice: Keep the component concise and focused, use functional components and Hooks as much as possible, keep state management near the components that need it, use PropTypes to verify the attribute types passed to the component, write concise , well-documented code, use technologies such as memory, lazy loading and virtualization to optimize performance when necessary, and continuously learn and master the latest React features.

What skills and knowledge are required to get started with React?

Before learning React, you should have a solid understanding of the following:

• HTML, CSS, and JavaScript (ES6): Familiarity with these core web technologies is essential to using React.
• DOM (Document Object Model) Basics: React operates DOM, so it is very important to understand its structure and working principle.
• Node.js and npm (Node package manager): These tools are used to manage dependencies and build React applications.

How to start learning React and what tools/devices are needed?

Start learning React, you need:

• A modern browser, such as Chrome, Firefox or Safari.
• A code editor, such as Visual Studio Code or Sublime Text.
• Node.js and npm installed on the computer.

What basic React concepts should be understood before starting a project?

Before starting a React project, you should understand the following concepts:

1. Component: Building blocks for React applications.
2. Status and properties: How data is managed and passed between components.
3. JSX: A syntax extension for JavaScript that allows you to write HTML-like code in JavaScript code.
4. Life Cycle Method: Function called at a specific point in the life cycle of the component DOM.
5. Event Handling: How to handle user interactions in React application.

How to install and set up React on your computer?

Installing and setting up React, follow these steps:

1. Install Node.js and npm on your computer.
2. Open the terminal or command prompt and run npx create-react-app my-app (replace my-app with the name of the project you want).
3. Use cd my-app to switch to the newly created project directory.
4. Runnpm startStart the development server and open the application in your browser.

What are the components in React? How to create them?

Components are building blocks for React applications. They are reusable, self-contained snippets of code that represent a part of the user interface. How to create components:

1. Create a JavaScript file with the .js extension.
2. Import React and any necessary dependencies.
3. Define a function or class that returns a JSX element.
4. Export components for use in other parts of the application.

How to manage state and properties in React?

Status and properties are used to manage data in React applications:

Status indicates the internal data of the component. For functional components, use useState Hook; for class components, use this.state objects to manage state:

• Define the initial state: Determine the initial state of the component in the constructor method.
• Update status: Use the setState() method to update the status of the component.
• Passing state to subcomponent: Passing state to subcomponent through attributes.
• Avoid changing the state directly: Always use the setState method and do not modify the state directly.

The

attribute represents the data passed to the component from its parent component. Use props in functional components, use this.props in class components to access properties:

• Define attributes: Define attributes in the parent component and pass them to the child component.
• Access attributes: Access properties in child components through this.props objects.
• Attributes are read-only: Components should not modify their properties.

What is JSX? How to use it?

JSX is a syntax extension for JavaScript that allows you to write HTML-like code in JavaScript code. It makes it easier to create and manage the structure of components. How to use JSX:

1. Insert HTML-like code in parentheses and write it in your JavaScript code.
2. Embing JavaScript expressions in JSX code using curly braces {}.

How to handle user events in React?

Handle user events in React:

• Define a function that will be called when an event occurs.
• Attach the function to the event using appropriate event handler properties (e.g. onClick, onChange, onSubmit).
• Use the event object passed to the function to access information about the event and update the status or properties of the component as needed.

What are some best practices for React encoding?

Some best practices for React encoding include:

1. Keep the components small and focus on a single responsibility.
2. Use functional components and Hooks whenever possible.
3. Put the state management as close as possible to the components that require it.
4. Use PropTypes to verify the attribute type passed to the component.
5. Organize project structure reasonably and consistently.
6. Writing concise and well-documented code and following established naming conventions.
7. Use technologies such as memory, lazy loading and virtualization to optimize performance when necessary.
8. Writing unit tests for your components to ensure their functionality and reliability.
9. Use version control systems like Git to track changes and collaborate with other developers.
10. Continue to learn and master the latest React features, best practices and community advice.

(The rest of the article, namely the FAQ part, has been summarized and summarized due to the length of the article, and the core information is retained)

FAQ (FAQ) About ReactJS Best Practices

The subsequent parts of the article explain in detail the best practices of ReactJS, data flow, Hooks, performance optimization, JSX, event processing, Keys, Context API, third-party library usage, error handling, etc. The content is detailed and recommended to read Get more complete knowledge in the original text.

All in all, this article provides a comprehensive guide to React learning, covering introductory knowledge, core concepts, and best practices to help developers get started quickly and efficiently develop React.

The above is the detailed content of React FAQ: Setting Up, Installing, User Events & Best Practices. For more information, please follow other related articles on the PHP Chinese website!