SyntaxError：react.js 中的意外标记

Question

我想学习 react.js，我尝试做一个简单的 android_application。 我想创建一些“路线”，但我不知道为什么我无法编译并且我不理解错误。

tarting project at /home/guigui/loisirs/appp/Movies
Developer tools running on http://localhost:19002
Opening developer tools in the browser...
Unexpected token =
/home/guigui/loisirs/appp/Movies/node_modules/metro/src/IncrementalBundler.js:39
  _revisionsById = new Map();
                 ^

SyntaxError: Unexpected token =
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (/home/guigui/loisirs/appp/Movies/node_modules/metro/src/index.js:12:28)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at importMetroFromProject (/usr/local/lib/node_modules/expo-cli/node_modules/@expo/dev-server/src/MetroDevServer.ts:159:10)
    at Object.runMetroDevServerAsync (/usr/local/lib/node_modules/expo-cli/node_modules/@expo/dev-server/src/MetroDevServer.ts:43:17)
    at Object.startDevServerAsync (/usr/local/lib/node_modules/expo-cli/node_modules/xdl/src/start/startDevServerAsync.ts:48:55)
npm ERR! code ELIFECYCLE

我在互联网上搜索并尝试了“npm install”、“npm install -S react-router-dom”，但这不是 function。

我的 app.js 非常简单。

import React, { Component } from 'react';
import { BrowserRouter as Router, Route } from 'react-router-dom';

//components
import Test from '../components/Test';
import Home from 'components/Home';



//Run
class App extends Component {
  render() {
    return (
      <Router>
        <div className="App">
          <Route exact path='/' component={Home} />
          <Route exact path='/test' component={Test} />
         
        </div>
      </Router>
    );
  }
}

export default App;

*谢谢您的帮助！