September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
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454
｜
第
17
章
记录项目使用的
Node
版本号不是一件简单的事。如果你想指明，可以在项目的根
目录中添加一个
.nvmrc
文件。这个文件的内容是项目应该使用的
Node
版本，如下
所示。
#
默认为最新的长期支持版本
$ lts/*
#
使用具体的版本
$ 14.15.4
若想使用项目的
.nvmrc
文件中指定的版本，在项目根目录中执行
nvm use
命令。
对大型项目来说，使用容器技术（例如
Docker
）更方便，可以确保在不同
的环境（包括部署）中使用一致的版本。
Node
文档中有一篇指南，说明如
何
Docker
化
Node.js Web
应用（
https://oreil.ly/phXQZ
）。
17.2
响应简单的浏览器请求
17.2.1
问题
你想创建一个
Node
应用，响应最基本的浏览器请求。
17.2.2
方案
使用内置的
Node HTTP
服务器响应请求。
//
加载
http
模块
const
http = require('http');
//
创建
http
服务器
http
.createServer((req, res) => {
//
内容首部
res.writeHead(200, { 'content-type': 'text/plain' });
//
写入消息，指明通信结束
res.end('Hello, World!');
Node
基础
｜
455
})
.listen(8124);
console.log('Server running on port 8124');
17.2.3
讨论
方案中的示例是一个“ ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.