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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172
｜
第
16
章
16.3
创建
React
应用
开始一个
React
应用最好的方式是使用
create-react-app
（
CRA
）这个工具，它会创建所
有的项目样板代码、开发者工具，并提供一个最小的应用让你作为起点。而且，
create-
react-app
会让它的配置保持更新，因此我们可以专注于应用的构建而无须再为框架工具
链而分心。尽管这么说，如果真的需要配置工具链，也可以把应用从工具链中分离出来，
这样虽然不能再跟最新的
CRA
工具链保持一致，但也获得了对应用配置完全的控制。
一直以来，我们应用开发的一切工作成果都是跟
Express
应
用合为一体的，而
SPA
最好是
被看作一个分离的独立应用。如此一来，就有了
两个
应用根目录。清晰起见，当我提及
Express
应用所在的目录时
，会说
服务器根目录
；当提及
React
应用所在的目录时
，会说
客
户端根目录
。而
应用根目录
是这两个目录所在的目录。
既然如此，那就进入你的应用根目录，创建一个名为
server
的目录
，这就是
Express
应用
服务器所在的地方。不用创建客户端应用的目录，
CRA
会为我们创建。
运行
CRA
之前需要先安装
Y
arn
。
Yarn
是一个包管理器，跟
npm
类似。
实际上，
Yarn
基
本上完全替代了
npm
。
虽然
React
开发并未强制使用
Yarn
，但它已经成为事实标准了，不
使用它无异于要“逆流而上”。虽然
Y
arn
和
npm
在用法上有一些微小差异，但是很可能你
只会注意到，你要运行的是
yarn add
而不是
npm install
。要安装
Yarn
，只需遵照
Yarn
官
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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.