Question

我是React的初学者，遇到了一些问题。我正在使用服务器渲染，并使用express作为服务器，并收到错误消息：错误：不变失败：浏览器历史记录需要DOM。我检查了来自各个站点的解决方案，并应用了它们的解决方案，但是在应用不同的解决方案时遇到了不同的错误。如前所述，我遇到一个错误：TypeError：无法读取未定义的属性“位置”，我通过从“ react-router-dom”导入-import {BrowserRouter as Router）将Router更改为BrowserRouter，此后，我得到了以下信息错误。

index.js

import React from 'react';
import ReactDOM from 'react-dom';
import Route from 'react-router-dom';

import App from './components/App';

ReactDOM.hydrate(
 <Router><App /></Router> ,
  document.getElementById('mountNode'),
);

App.js

import React, { useState } from 'react';
import {Route,Switch,browserHistory} from "react-router-dom";
import { BrowserRouter as Router } from 'react-router-dom';
import { createMemoryHistory } from 'history';


import HomePage from './HomePage';
import About from './About';
export default function App()
{

//const history = createMemoryHistory();
    return (
    <Router history={browserHistory}> 
        <Switch>
            <Route path="/" exact component={HomePage}/>
            <Route path="/about" component={About}/>  
        </Switch>
    </Router>
    );
}

错误

Error: Invariant failed: Browser history needs a DOM
at invariant (C:\LMS-APP\node_modules\tiny-invariant\dist\tiny-invariant.cjs.js:13:11)
at Object.createHistory [as createBrowserHistory] (C:\LMS-APP\node_modules\history\cjs\history.js:273:16)
at new BrowserRouter (C:\LMS-APP\node_modules\react-router-dom\modules\BrowserRouter.js:11:13)
at processChild (C:\LMS-APP\node_modules\react-dom\cjs\react-dom-server.node.development.js:2995:14)
at resolve (C:\LMS-APP\node_modules\react-dom\cjs\react-dom-server.node.development.js:2960:5)
at ReactDOMServerRenderer.render (C:\LMS-APP\node_modules\react-dom\cjs\react-dom-server.node.development.js:3435:22)
at ReactDOMServerRenderer.read (C:\LMS-APP\node_modules\react-dom\cjs\react-dom-server.node.development.js:3373:29)
at Object.renderToString (C:\LMS-APP\node_modules\react-dom\cjs\react-dom-server.node.development.js:3988:27)
at C:\LMS-APP\src\server\/server.js:10:40
at Layer.handle [as handle_request] (C:\LMS-APP\node_modules\express\lib\router\layer.js:95:5)

package.json

{
  "name": "LMS-APP",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
   "dev-server": "nodemon --exec babel-node src/server/server.js --ignore dist/",
   "dev-bundle": "webpack -w -d"
  },
     "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@babel/core": "^7.9.6",
    "@babel/node": "^7.8.7",
    "@babel/preset-env": "^7.9.6",
    "@babel/preset-react": "^7.9.4",
    "babel-loader": "^8.1.0",
    "express": "^4.17.1",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-router-dom": "^5.2.0",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.11"
  },
  "devDependencies": {
    "babel-eslint": "^10.1.0",
    "eslint": "^7.0.0",
    "eslint-plugin-react": "^7.20.0",
    "eslint-plugin-react-hooks": "^4.0.2",
    "nodemon": "^2.0.4"
  }
}

Answer 1

由于您将express.js用作服务器，因此我相信您还需要配置server.js代码。由于底部的错误日志告诉我们第一个被调用的文件是at C:\LMS-APP\src\server\/server.js:10:40。

在该网站https://reacttraining.com/react-router/web/guides/server-rendering中，有一个“将它们放在一起”部分，您也可以在服务器端代码中遵循并实现正确的代码。请记住，由于您使用的是express.js，因此请根据服务器上的代码进行调整。

还要注意网站上的代码示例。就像这个方块：

const html = ReactDOMServer.renderToString(
      <StaticRouter location={req.url} context={context}>
        <App />
      </StaticRouter>
);

上面的代码段将放置在server.js文件中。

需要使用React Router的<StaticRouter>组件来解决有关“错误：不变失败：浏览器历史记录需要DOM”的错误。

server.get("*", (req, res) => {
  // Render the component to a string.
  const html = ReactDOMServer.renderToString(    
    <StaticRouter location={req.url} context={context}>
      <App />
    </StaticRouter>

  );
  const finalDocument =`<html>
                          <head>
                            <title>Your App Title</title>
                          </head>
                          <body>
                            <div id="root">${html}</div>
                          </body>
                         </html>
                        `;
    res.send(finalDocument);
  }
});

这是您应该为server.get（）函数准备的示例代码。服务器变量包含快速应用。

如果错误仍然存在，则应将server.get（）函数中的第一个参数从server.get("/", ....)更改为server.get("*", ....)。

*号表示通配符，这意味着对服务器或默认URL的任何访问将由服务器端GET http://localhost:<port>处理。

服务器渲染反应路由器Dom V ^ 5.2.0错误：不变失败：浏览器历史记录需要DOM

1 个答案: