Node.js v20.11.1 文档


用法和示例#

Usage and example

使用方法#

Usage

node [options] [V8 options] [script.js | -e "script" | - ] [arguments]

有关详细信息,请参阅 命令行选项 文档。

Please see the Command-line options document for more information.

示例#

Example

用 Node.js 编写的 web 服务器 的示例,它响应 'Hello, World!'

An example of a web server written with Node.js which responds with 'Hello, World!':

本文档中的命令以 $> 开头,以复制其在用户终端中的显示方式。不要包含 $> 字符。它们在那里显示每个命令的开始。

Commands in this document start with $ or > to replicate how they would appear in a user's terminal. Do not include the $ and > characters. They are there to show the start of each command.

不以 $> 字符开头的行显示上一个命令的输出。

Lines that don't start with $ or > character show the output of the previous command.

首先,确保已经下载并安装了 Node.js。有关更多安装信息,请参阅 通过包管理器安装 Node.js

First, make sure to have downloaded and installed Node.js. See Installing Node.js via package manager for further install information.

现在,创建一个名为 projects 的空项目文件夹,然后导航到其中。

Now, create an empty project folder called projects, then navigate into it.

Linux 和 Mac:

Linux and Mac:

mkdir ~/projects
cd ~/projects 

Windows CMD:

mkdir %USERPROFILE%\projects
cd %USERPROFILE%\projects 

Windows PowerShell:

mkdir $env:USERPROFILE\projects
cd $env:USERPROFILE\projects 

接下来,在 projects 文件夹中创建新的源文件并将其命名为 hello-world.js

Next, create a new source file in the projects folder and call it hello-world.js.

在任何首选的文本编辑器中打开 hello-world.js 并粘贴以下内容:

Open hello-world.js in any preferred text editor and paste in the following content:

const http = require('node:http');

const hostname = '127.0.0.1';
const port = 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, World!\n');
});

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
}); 

保存文件。然后,在终端窗口中运行 hello-world.js 文件,输入:

Save the file. Then, in the terminal window, to run the hello-world.js file, enter:

node hello-world.js 

这样的输出应该出现在终端中:

Output like this should appear in the terminal:

Server running at http://127.0.0.1:3000/ 

现在,打开任何首选的网络浏览器并访问 http://127.0.0.1:3000

Now, open any preferred web browser and visit http://127.0.0.1:3000.

如果浏览器显示字符串 Hello, World!,则表示服务器正在工作。

If the browser displays the string Hello, World!, that indicates the server is working.