Next.js - 环境设置

由于 Next.js 是基于 React 的框架，我们使用的是 Node 环境。现在确保已在系统中安装了 Node.js 和 npm。可以使用以下命令安装 Next.js −

npm install next react react-dom

在成功安装 Next.js 后，可以看到以下输出 −

+ react@16.13.1
+ react-dom@16.13.1
+ next@9.4.4
added 831 packages from 323 contributors and audited 834 packages in 172.989s

现在，让我们创建一个节点 package.json −

npm init

在创建 package.json 时选择默认值 −

This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help json` for definitive documentation on these fields
and exactly what they do.

Use `npm install <pkg>` afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
package name: (nextjs)
version: (1.0.0)
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to \Node\nextjs\package.json:
{
   "name": "nextjs",
   "version": "1.0.0",
   "description": "",
   "main": "index.js",
   "dependencies": {
      "next": "^9.4.4",
      "react": "^16.13.1",
      "react-dom": "^16.13.1"
   },
   "devDependencies": {},
   "scripts": {
      "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "",
   "license": "ISC"
}
Is this OK? (yes)

现在更新 package.json 的脚本部分，以包含 Next.js 命令。

{
   "name": "nextjs",
   "version": "1.0.0",
   "description": "",
   "main": "index.js",
   "dependencies": {
      "next": "^9.4.4",
      "react": "^16.13.1",
      "react-dom": "^16.13.1"
   },
   "devDependencies": {},
   "scripts": {
      "test": "echo \"Error: no test specified\" && exit 1",
      "dev": "next",
      "build": "next build",
      "start": "next start"
   },
   "author": "",
   "license": "ISC"
}

创建 pages 目录。

在 nextjs 文件夹内创建一个 pages 文件夹，并创建一个名为 index.js 的文件，其内容如下。

function HomePage() {
   return <div>Welcome to Next.js!</div>
}

export default HomePage

启动 Next.js 服务器

运行以下命令启动服务器 −

npm run dev
> nextjs@1.0.0 dev \Node\nextjs
> next

ready - started server on https://:3000
event - compiled successfully
event - build page: /
wait  - compiling...
event - compiled successfully
event - build page: /next/dist/pages/_error
wait  - compiling...
event - compiled successfully

验证输出

在浏览器中打开 localhost:3000，将看到以下输出。