新手入门
Create React App 是官方支持的创建单页 React 应用的方法。它提供了一个没有配置的现代构建设置。
¥Create React App is an officially supported way to create single-page React applications. It offers a modern build setup with no configuration.
快速开始
¥Quick Start
npx create-react-app my-app
cd my-app
npm start
如果你之前通过
npm install -g create-react-app
全局安装了create-react-app
,我们建议你使用npm uninstall -g create-react-app
或yarn global remove create-react-app
卸载软件包,以确保npx
始终使用最新版本。¥If you've previously installed
create-react-app
globally vianpm install -g create-react-app
, we recommend you uninstall the package usingnpm uninstall -g create-react-app
oryarn global remove create-react-app
to ensure thatnpx
always uses the latest version.
(npx 附带 npm 5.2+ 及更高版本,请参阅 旧 npm 版本的说明)
¥(npx comes with npm 5.2+ and higher, see instructions for older npm versions)
然后打开 http://localhost:3000/ 以查看你的应用。
¥Then open http://localhost:3000/ to see your app.
当你准备好部署到生产环境时,使用 npm run build
创建一个压缩包。
¥When you’re ready to deploy to production, create a minified bundle with npm run build
.
立即开始
¥Get Started Immediately
你不需要安装或配置 webpack 或 Babel 等工具。它们是预先配置和隐藏的,因此你可以专注于代码。
¥You don’t need to install or configure tools like webpack or Babel. They are preconfigured and hidden so that you can focus on the code.
创建一个项目,一切顺利。
¥Create a project, and you’re good to go.
创建应用
¥Creating an App
你的本地开发计算机上需要有 Node >= 14(但服务器上不需要)。你可以使用 nvm (macOS/Linux) 或 nvm-windows 在不同项目之间切换 Node 版本。
¥You’ll need to have Node >= 14 on your local development machine (but it’s not required on the server). You can use nvm (macOS/Linux) or nvm-windows to switch Node versions between different projects.
要创建新的应用,你可以选择以下方法之一:
¥To create a new app, you may choose one of the following methods:
npx
npx create-react-app@latest my-app
(npx 附带 npm 5.2+ 及更高版本,请参阅 旧 npm 版本的说明)
¥(npx comes with npm 5.2+ and higher, see instructions for older npm versions)
npm
npm init react-app my-app
npm init <initializer>
在 npm 6+ 中可用
¥npm init <initializer>
is available in npm 6+
Yarn
yarn create react-app my-app
yarn create
适用于 Yarn 0.25+
¥yarn create
is available in Yarn 0.25+
选择模板
¥Selecting a template
你现在可以选择通过将 --template [template-name]
附加到创建命令来从模板启动新应用。
¥You can now optionally start a new app from a template by appending --template [template-name]
to the creation command.
如果你不选择模板,我们将使用我们的基本模板创建你的项目。
¥If you don't select a template, we'll create your project with our base template.
模板始终以 cra-template-[template-name]
格式命名,但是你只需将 [template-name]
提供给创建命令即可。
¥Templates are always named in the format cra-template-[template-name]
, however you only need to provide the [template-name]
to the creation command.
npx create-react-app my-app --template [template-name]
你可以通过在 npm 上搜索 "cra-模板-*" 来找到可用模板的列表。
¥You can find a list of available templates by searching for "cra-template-*" on npm.
我们的 自定义模板 文档描述了如何构建你自己的模板。
¥Our Custom Templates documentation describes how you can build your own template.
创建 TypeScript 应用
¥Creating a TypeScript app
你可以使用模板启动一个新的 TypeScript 应用。要使用我们提供的 TypeScript 模板,请将 --template typescript
附加到创建命令。
¥You can start a new TypeScript app using templates. To use our provided TypeScript template, append --template typescript
to the creation command.
npx create-react-app my-app --template typescript
如果你已经有一个项目并想添加 TypeScript,请参阅我们的 添加 TypeScript 文档。
¥If you already have a project and would like to add TypeScript, see our Adding TypeScript documentation.
选择包管理器
¥Selecting a package manager
当你创建一个新的应用时,CLI 将使用 npm 或 Yarn 来安装依赖,具体取决于你使用哪种工具来运行 create-react-app
。例如:
¥When you create a new app, the CLI will use npm or Yarn to install dependencies, depending on which tool you use to run create-react-app
. For example:
# Run this to use npm
npx create-react-app my-app
# Or run this to use yarn
yarn create react-app my-app
输出
¥Output
运行这些命令中的任何一个都会在当前文件夹中创建一个名为 my-app
的目录。在该目录中,它将生成初始项目结构并安装传递依赖:
¥Running any of these commands will create a directory called my-app
inside the current folder. Inside that directory, it will generate the initial project structure and install the transitive dependencies:
my-app
├── README.md
├── node_modules
├── package.json
├── .gitignore
├── public
│ ├── favicon.ico
│ ├── index.html
│ ├── logo192.png
│ ├── logo512.png
│ ├── manifest.json
│ └── robots.txt
└── src
├── App.css
├── App.js
├── App.test.js
├── index.css
├── index.js
├── logo.svg
├── serviceWorker.js
└── setupTests.js
没有配置或复杂的文件夹结构,只有构建应用所需的文件。安装完成后,你可以打开项目文件夹:
¥No configuration or complicated folder structures, only the files you need to build your app. Once the installation is done, you can open your project folder:
cd my-app
脚本
¥Scripts
在新创建的项目中,你可以运行一些内置命令:
¥Inside the newly created project, you can run some built-in commands:
npm start
或 yarn start
¥npm start
or yarn start
在开发模式下运行应用。在浏览器中打开 http://localhost:3000 进行查看。
¥Runs the app in development mode. Open http://localhost:3000 to view it in the browser.
如果你更改代码,页面将自动重新加载。你将在控制台中看到构建错误和代码检查警告。
¥The page will automatically reload if you make changes to the code. You will see the build errors and lint warnings in the console.
npm test
或 yarn test
¥npm test
or yarn test
以交互模式运行测试监视器。默认情况下,运行与自上次提交以来更改的文件相关的测试。
¥Runs the test watcher in an interactive mode. By default, runs tests related to files changed since the last commit.
npm run build
或 yarn build
¥npm run build
or yarn build
将用于生产的应用构建到 build
文件夹。它在生产模式下正确地打包了 React,并优化了构建以获得最佳性能。
¥Builds the app for production to the build
folder. It correctly bundles React in production mode and optimizes the build for the best performance.
构建被压缩并且文件名包含哈希。
¥The build is minified and the filenames include the hashes.
你的应用已准备好部署。
¥Your app is ready to be deployed.