Create-React-App 的一些配置

添加多页面配置

1. npm run eject
2. 修改 webpack.config.js

entry 修改:
这里我加了一个 update.html 页面

entry: {
  index: [
    // Include an alternative client for WebpackDevServer. A client's job is to
    // connect to WebpackDevServer by a socket and get notified about changes.
    // When you save a file, the client will either apply hot updates (in case
    // of CSS changes), or refresh the page (in case of JS changes). When you
    // make a syntax error, this client will display a syntax error overlay.
    // Note: instead of the default WebpackDevServer client, we use a custom one
    // to bring better experience for Create React App users. You can replace
    // the line below with these two lines if you prefer the stock client:
    // require.resolve('webpack-dev-server/client') + '?/',
    // require.resolve('webpack/hot/dev-server'),
    isEnvDevelopment &&
    require.resolve('react-dev-utils/webpackHotDevClient'),
    // Finally, this is your app's code:
    paths.appIndexJs,
    // We include the app code last so that if there is a runtime error during
    // initialization, it doesn't blow up the WebpackDevServer client, and
    // changing JS code would still trigger a refresh.
  ].filter(Boolean),
  update: [
    isEnvDevelopment &&
    require.resolve('react-dev-utils/webpackHotDevClient'),
    paths.appSrc + '/update.js',
  ].filter(Boolean),
},

output 修改

output: {
      // The build folder.
      path: isEnvProduction ? paths.appBuild : undefined,
      // Add /* filename */ comments to generated require()s in the output.
      pathinfo: isEnvDevelopment,
      // There will be one main bundle, and one file per asynchronous chunk.
      // In development, it does not produce real files.
      filename: isEnvProduction
        ? 'static/js/[name].[contenthash:8].js'
        : isEnvDevelopment && 'static/js/[name]bundle.js',
      // There are also additional JS chunk files if you use code splitting.
      chunkFilename: isEnvProduction
        ? 'static/js/[name].[contenthash:8].chunk.js'
        : isEnvDevelopment && 'static/js/[name].chunk.js',
      // We inferred the "public path" (such as / or /my-project) from homepage.
      // We use "/" in development.
      publicPath: publicPath,
      // Point sourcemap entries to original disk location (format as URL on Windows)
      devtoolModuleFilenameTemplate: isEnvProduction
        ? info =>
            path
              .relative(paths.appSrc, info.absoluteResourcePath)
              .replace(/\\/g, '/')
        : isEnvDevelopment &&
          (info => path.resolve(info.absoluteResourcePath).replace(/\\/g, '/')),
    },

注意修改其中的 filename

HtmlWebpackPlugin 修改:
新增一个 HtmlWebpackPlugin

new HtmlWebpackPlugin(
        Object.assign(
          {},
          {
            inject: true,
            template: paths.appHtml,
            chunks: ["index"]
          },
          isEnvProduction
            ? {
                minify: {
                  removeComments: true,
                  collapseWhitespace: true,
                  removeRedundantAttributes: true,
                  useShortDoctype: true,
                  removeEmptyAttributes: true,
                  removeStyleLinkTypeAttributes: true,
                  keepClosingSlash: true,
                  minifyJS: true,
                  minifyCSS: true,
                  minifyURLs: true,
                },
              }
            : undefined
        )
      ),
      new HtmlWebpackPlugin(
          Object.assign(
              {},
              {
                inject: true,
                template: paths.appHtml,
                chunks: ["update"],
                filename: "update.html"
              },
              isEnvProduction
                  ? {
                    minify: {
                      removeComments: true,
                      collapseWhitespace: true,
                      removeRedundantAttributes: true,
                      useShortDoctype: true,
                      removeEmptyAttributes: true,
                      removeStyleLinkTypeAttributes: true,
                      keepClosingSlash: true,
                      minifyJS: true,
                      minifyCSS: true,
                      minifyURLs: true,
                    },
                  }
                  : undefined
          )
      ),

在 public 目录里添加 update.html, 内容照抄 index.html 文件即可;
在 src 目录下添加 update.js 文件:

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import Update from './page/Update';
import * as serviceWorker from './serviceWorker';

ReactDOM.render(<Update />, document.getElementById('root'));
serviceWorker.register();

之后, http://localhost:3000/update.html 即可访问; 如果想加个路径,直接修改 HtmlWebpackPlugin 里的 filename, 例如 filename: "index/update.html"
就可以 使用 http://localhost:3000/index/update.html 来访问

引入 src 目录以外的文件报错

例如需要引入 public 目录下的图片,就会报错,此时,注释掉

// new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),

这一行,重启即可.