Question

我尝试像这样为我的应用程序设置嵌套路由

/->主页
/about->关于页面
/protected->受保护的默认页面
/protected/page1->受保护的页面1

它在codeandbox（https://codesandbox.io/s/react-router-nested-route-utqy7）中正常工作React 16.8.1 React Router 4.3.1

但是，当我使用webpack-dev-server（3.7.1）进行设置时，它只能到达/，而无法到达其余路由。

我的文件结构就像

├── package.json
├── src
│   ├── index.jsx
│   └── index.html
├── webpack
│   ├── paths.js
│   ├── webpack.common.js
│   └── webpack.dev.js
└── webpack.config.js

paths.js

const path = require('path');

module.exports = {
  outputPath: path.resolve(__dirname, '../', 'build'),
  entryPath: path.resolve(__dirname, '../', 'src/index.jsx'),
  templatePath: path.resolve(__dirname, '../', 'src/index.html'),
};

webpack.common.js

const webpack = require('webpack');
const convert = require('koa-connect');
const history = require('connect-history-api-fallback');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ScriptExtHtmlWebpackPlugin = require('script-ext-html-webpack-plugin');
const commonPaths = require('./paths');

module.exports = {
  entry: commonPaths.entryPath,
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        loader: 'babel-loader',
        exclude: /(node_modules)/,
      },
    ],
  },
  serve: {
    add: app => {
      app.use(convert(history()));
    },
    content: commonPaths.entryPath,
    dev: {
      publicPath: commonPaths.outputPath,
    },
    open: true,
  },
  resolve: {
    modules: ['src', 'node_modules'],
    extensions: ['*', '.js', '.jsx', '.css', '.scss'],
  },
  plugins: [
    new webpack.ProgressPlugin(),
    new HtmlWebpackPlugin({
      template: commonPaths.templatePath,
    }),
    new ScriptExtHtmlWebpackPlugin({
      defaultAttribute: 'async',
    }),
  ],
};

webpack.dev.js

const webpack = require('webpack');
const commonPaths = require('./paths');

module.exports = {
  mode: 'development',
  output: {
    filename: '[name].js',
    path: commonPaths.outputPath,
    chunkFilename: '[name].js',
  },
  module: {
    rules: [
      {
        test: /\.(css|scss)$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
          },
          'sass-loader',
        ],
      },
    ],
  },
  devServer: {
    contentBase: commonPaths.outputPath,
    compress: true,
    hot: true,
  },
  plugins: [new webpack.HotModuleReplacementPlugin()],
};

webpack.config.js

const webpackMerge = require('webpack-merge');
const common = require('./webpack/webpack.common');

const devConfig = require(`./webpack/webpack.dev.js`);
module.exports = webpackMerge(common, devConfig);

index.jsx

import React from "react";
import { render } from "react-dom";
import { BrowserRouter, Route } from "react-router-dom";

const Homepage = () => (
  <div>
    <h1>Home Page</h1>
  </div>
);
const AboutPage = () => (
  <div>
    <h1>About</h1>
  </div>
);
const Protected = () => (
  <div>
    <h1>Protected default page</h1>
  </div>
);
const ProtectedPage1 = () => (
  <div>
    <h1>ProtectedPage1</h1>
  </div>
);

render(
  <BrowserRouter>
    <div>
      <Route path="/" component={Homepage} exact />
      <Route path="/about" component={AboutPage} />

      <Route
        path="/protected"
        render={({ match: { url } }) => (
          <div>
            <Route path={`${url}/`} component={Protected} exact />
            <Route path={`${url}/page1`} component={ProtectedPage1} />
          </div>
        )}
      />
    </div>
  </BrowserRouter>,
  document.getElementById('app')
);

我认为某些路径在我的配置中不正确，我只是无法弄清楚哪里出了错。

Answer 1

我遇到了问题中描述的相同问题（webpack-dev-server不提供嵌套路由，顶级路由正常工作）。可悲的是，historyApiFallback: true和publicPath: '/'都没有工作。实际上，问题出在index.html内部，更确切地说是<script src="bundle.js"></script>内部。更改为

<script src="/bundle.js"></script>       <!-- do include slash before the file name -->

足以结束痛苦。

Answer 2

我终于弄清楚了webpack-dev-server无法提供嵌套路由的原因。

作为单页应用程序，当您访问React应用程序的/somepath时，它实际上会回退到/并将路径名传递给react路由器。 React Router将使用浏览器的历史记录API导航到/somepath。

由于某些未知原因，webpack-dev-server默认情况下不会启用此“回退到历史API”行为。

因此，我们需要将historyApiFallback: true,添加到webpack配置的devServer中。

现在，所有顶级路由（如/somepath都可以使用，但对于嵌套路由（如/somepath/morepath）来说，这还不够。

使用默认的webpack-dev-server设置，已编译的html模板将指向捆绑的js，例如<script type="text/javascript" src="main.js"></script>。请注意src="main.js"，它假定main.js与index.html在同一路径下。该假设对顶级路径/somepath是正确的，但对于嵌套路由/somepath/morepath，此假设将导致html文件像main.js一样访问/somepath/main.js。

因此，我们最终寻找一种方法来为html文件访问绑定的js指定一个特定位置。并且，这是publicPath的工作。将publicPath: '/',添加到webpack配置的输出块中。它会告诉html始终访问main.js文件夹中的/，并且已编译的html将是<script type="text/javascript" src="/main.js"></script>。这正是我们想要的。

Answer 3

尝试添加：

<base href="/" />

到您的<head>的{{1}}标签。这样，它将始终寻找index.html包，即使是嵌套路由也是如此。

Answer 4

基本上包装，您的反应应用使用<HashRouter>而不是<BrowserRouter>可以正常运行，而无需进行任何Webpack配置修改，如果您不想使用HashRouter，则可以自由使用historyApiFallback：在Web中为true在webpack.config文件的底部打包dev服务器配置

like so
 const config = {

........
    devServer: {
        compress: true,
        port: 3000,
        https: false,
        historyApiFallback:true
    }
}

Answer 5

要在您的webpack.config.js文件中总结@Bing Lu的答案：

module.exports = () => ({
  mode: 'development',
  entry: ...,
  ...,
  output: {
    ...
    publicPath: '/' // <- this is the important line along with historyApiFallback = true in the dev server config
  },
  ...,
  devServer: {
    contentBase: path.join(__dirname, 'dist'),
    historyApiFallback: true,
    compress: true,
    ...
  },
})

React Router v4嵌套路由不适用于webpack-dev-server

5 个答案: