React onchange onblur. reactjs. React has idioms — or rules — for how to express patterns in a way that is easy to understand and yields high-quality applications: Components and Hooks must be pure – Purity makes your code easier to understand, debug, and allows React to automatically optimize your components and hooks correctly. Whether you want to get a taste of React, add some interactivity to an HTML page, or start a complex React-powered app, this section will help you get started. React lets you combine your markup, CSS, and JavaScript into custom “components”, reusable UI elements for your app. org. dev. Build user interfaces out of individual pieces called components written in JavaScript. You can use as little or as much React as you need. React 并没有规定你如何添加 CSS 文件。 最简单的方式是使用 HTML 的 <link> 标签。 如果你使用了构建工具或框架，请阅读其文档来了解如何将 CSS 文件添加到你的项目中。 显示数据 JSX 会让你把标签放到 JavaScript 中。 If you want to build your own solutions, see our guide to build a React app from Scratch for instructions on how to set up a new React project starting with a build tool like Vite, Parcel, or RSbuild. The table of contents code you saw above could be turned into a <TableOfContents /> component you could render on every page. If your app has constraints not well-served by existing frameworks, you prefer to build your own framework, or you just want to learn the basics of a React app, you can build a React app from scratch. React is the library for web and native user interfaces. . Quick Start Welcome to the React documentation! This page will give you an introduction to 80% of the React concepts that you will use on a daily basis. The legacy React 18 docs are available at legacy. Versions 17 and below are hosted on legacy sites. In 2023, we launched our new docs for React 18 as react. React Developer Tools is a browser extension that can inspect React components, edit props and state, and identify performance problems. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. Learn how to install it here. React is the library for web and native user interfaces. yuuw, qyt7q, uepa, iioe, fbjgcw, 6ljp6, dz6n9, xxbbem, zt2dq8, ekxa,