June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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34
｜
第
4
章
找这个模块。如果遗漏了这个前缀，就会出错。
现在，在“关于”页的路由里，可以利用模块的
getFortune
方法了：
app.get('/about', (req, res) => {
res.render('about', { fortune: fortune.getFortune() } )
})
如果你是跟着做下来的，就可以提交这些变更了：
git add -A git commit -m "Moved 'fortune cookie' into module."
你会发现模块是实现封装功能方便而强大的方式，它可以提升项目的总体设计和可维护
性，还可以简化测试。更多信息请参考
Node
模块的官方文档。
Node
模块有时被称作
CommonJS
（
CJS
）模块。这是向一个更旧一些的规范
致敬，
Node
是从它那里得到的启发
。
JavaScript
语言采纳了一个正式的包机
制，叫
ECMAScript
模
块（
ESM
）。如果你一直在使用
React
或别的新潮前
端语言，可能已经很熟悉
ESM
了
：它使用的是
import
和
export
（而不是
exports
、
module.exports
和
require
）。更多信息请查看
Axel Rauschmayer
博士的博文“
ECMAScript 6 modules: the final syntax
”。
4.8
小结
现在我们已经掌握了更多关于
Git
、
npm
和模块的知识，接下来将讨论如何在编码中采纳
一些好的
QA
实践，以创造更好的产品。
本章讲述了如下主题，希望你能记住。 ...
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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.