在Create-React-App应用程序中index.html和index.js之间的连接在哪里？ [英] Where's the connection between index.html and index.js in a Create-React-App application?
问题描述
我开始使用Create React App，但是我不明白 index.js 是如何装入 index的。 html 。这是html代码：
I'm starting to play with the Create React App, but I can't understand how the index.js is loaded inside index.html. This is the html code:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
<!--
Notice the use of %PUBLIC_URL% in the tag above.
It will be replaced with the URL of the `public` folder during the build.
Only files inside the `public` folder can be referenced from the HTML.
Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
work correctly both with client-side routing and a non-root public URL.
Learn how to configure a non-root public URL by running `npm run build`.
-->
<title>React App</title>
</head>
<body>
<div id="root"></div>
<!--
This HTML file is a template.
If you open it directly in the browser, you will see an empty page.
You can add webfonts, meta tags, or analytics to this file.
The build step will place the bundled scripts into the <body> tag.
To begin the development, run `npm start`.
To create a production bundle, use `npm run build`.
-->
</body>
</html>
但是我看不到 index.js 。连接在哪里？我缺少什么？
But I can't see anywhere the import of the index.js. Where is the connection? What am I missing?
推荐答案
在后台，Create React App使用Webpack和 html-webpack-plugin 。
Under the hood, Create React App uses Webpack with html-webpack-plugin.
我们的配置指定 Webpack使用 src / index.js 作为入口点 。因此，这是它读取的第一个模块，然后再读取到其他模块，以将它们编译为一个捆绑包。
Our configuration specifies that Webpack uses src/index.js as an "entry point". So that’s the first module it reads, and it follows from it to other modules to compile them into a single bundle.
当webpack编译资产时，它会生成一个（或多个（如果使用代码拆分）捆绑包。它使它们的最终路径可用于所有插件。我们正在使用一个这样的插件将脚本注入HTML。
When webpack compiles the assets, it produces a single (or several if you use code splitting) bundles. It makes their final paths available to all plugins. We are using one such plugin for injecting scripts into HTML.
我们已启用 html-webpack-plugin 生成HTML文件。在我们的配置中，我们指定，它应以 public / index.html 作为模板。我们还设置了注入 选项为 true 。使用该选项， html-webpack-plugin 将< script> 和Webpack提供的路径直接添加到最终的HTML页面。最后一页是在运行 npm run build 之后在 build / index.html 中获得的页面，从 / 获得服务，当您运行 npm start 。
We have enabled html-webpack-plugin to generate the HTML file. In our configuration, we specified that it should read public/index.html as a template. We have also set inject option to true. With that option, html-webpack-plugin adds a <script> with the path provided by Webpack right into the final HTML page. This final page is the one you get in build/index.html after running npm run build, and the one that gets served from / when you run npm start.
希望这会有所帮助！ Create React App的优点在于您实际上不需要考虑它。
Hope this helps! The beauty of Create React App is you don’t actually need to think about it.
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