Javascript 为什么我的路由器只加载默认路由？

我正在使用React路由器学习React应用程序中的页面导航

这是我的package.json

{
  "name": "tutorial",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "webpack-dev-server --inline --content-base .",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Rahul Shivsharan",
  "license": "ISC",
  "dependencies": {
    "react": "^16.8.4",
    "react-dom": "^16.8.4",
    "react-router": "^4.3.1",
    "react-router-dom": "^4.3.1"
  },
  "devDependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.3.4",
    "@babel/plugin-proposal-class-properties": "^7.3.4",
    "@babel/preset-env": "^7.3.4",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.5",
    "http-server": "^0.11.1",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.2.3",
    "webpack-dev-server": "^3.2.1"
  }
}

这是我的App.js

import React from "react";
import {Link} from "react-router";

export default class App extends React.Component{
    render(){
        return <div>Hello, React Router !!</div>
    }
}

我的问题是何时开始使用服务器

npm start

装载

在浏览器中加载 你好，反应路由器

当我这样做的时候

它表明,， 不能走动

同

它装载 无法获取/回购

为什么我不能加载默认路径以外的路径

请帮助我，无论我是否做错了什么，

您需要启用，以便webpack dev服务器将为当前提供

404 Not Found

响应的所有路由提供

index.html

文件

webpack.config.js

module.exports = {
  entry: "./index.js",
  output: {
    filename: "bundle.js",
    publicPath: ""
  },
  devServer: {
    historyApiFallback: true
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "babel-loader",
        query: {
          presets: ["@babel/react", "@babel/preset-env"],
          plugins: ["@babel/proposal-class-properties"]
        }
      }
    ]
  }
};

---

我能解决我的问题

我只需要在index.js中做一些更改，如下所示

import React from "react";
import ReactDOM from "react-dom";
import {BrowserRouter,Route, Switch} from "react-router-dom";  
import App from "./modules/App";
import Repos from "./modules/Repos";
import About from "./modules/About";

ReactDOM.render(
    (<BrowserRouter>
        <Switch>            
            <Route  exact path="/" component={App} />
            <Route  exact path="/repos" component={Repos} />
            <Route  exact path="/about" component={About} />        
        </Switch>
    </BrowserRouter>),  document.getElementById("app"));

"devServer": {
        "historyApiFallback": true
 }

就是这样，现在上面的例子起作用了

那么现在,

当我加载

我加载了App.js中返回的html

在

---

它加载的html以About.js等格式返回

但这并不能解决我的问题，我仍然无法在url或/About和/Repos上呈现以About.js和Repos.js编写的html

module.exports = {
    "entry" : "./index.js",
    "output" : {
        "filename" : "bundle.js",
        "publicPath" : ""
    },
    "module" : {
        "rules" : [{
            "test" : /\.js$/,
            "exclude" : /node_modules/,
            "loader" : "babel-loader",
            "query": {
                "presets": ['@babel/react', '@babel/preset-env'],
                "plugins": ['@babel/proposal-class-properties']
            }
        }]
    }
}

npm start

module.exports = {
  entry: "./index.js",
  output: {
    filename: "bundle.js",
    publicPath: ""
  },
  devServer: {
    historyApiFallback: true
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "babel-loader",
        query: {
          presets: ["@babel/react", "@babel/preset-env"],
          plugins: ["@babel/proposal-class-properties"]
        }
      }
    ]
  }
};

import React from "react";
import ReactDOM from "react-dom";
import {BrowserRouter,Route, Switch} from "react-router-dom";  
import App from "./modules/App";
import Repos from "./modules/Repos";
import About from "./modules/About";

ReactDOM.render(
    (<BrowserRouter>
        <Switch>            
            <Route  exact path="/" component={App} />
            <Route  exact path="/repos" component={Repos} />
            <Route  exact path="/about" component={About} />        
        </Switch>
    </BrowserRouter>),  document.getElementById("app"));

"devServer": {
        "historyApiFallback": true
 }