在 Heroku 中部署 React 应用程序会得到一个空白页面

Question

我的问题是当我在部署我的 React 应用程序后尝试使用 Heroku 打开时我在我的 index.html 中得到一个具有相同标题的空白页，我想做的是将我的应用程序部署到后端和前端的 Heroku，当我运行它在本地工作时

server.js

import express from 'express';
import mongoose from 'mongoose';
import Messages from "./dbMessages.js";
import Pusher from "pusher";
import path from 'path';
import cors from 'cors';
// importing
const __dirname = path.resolve(path.dirname(''));

//app config
const app =express();
const port=process.env.PORT || 9000;

if(process.env.NODE_ENV === 'production')
{
    app.use(express.static('./whatsapp-frontend/buid'))
    app.get('*',(req, res) => {
        res.sendFile(path.join(__dirname,'./whatsapp-frontend','build','index.html'))
    })
}
const pusher = new Pusher({
    appId: "1322521",
    key: "11eff1cbbe0451f43821",
    secret: "9bcbb587eab320e5786b",
    cluster: "ap2",
    useTLS: true
  });
//middleware
app.use(express.json());
  app.use(cors())



//DB config
const connection_url='mongodb+srv://admin:T0XbedbMkVBNWrBQ@cluster0.owkc8.mongodb.net/whatsappdb?retryWrites=true&w=majority';
mongoose.connect(connection_url);


const db =mongoose.connection

db.once('open',()=>{
    console.log('Db connect');

    const msgCollection =db.collection('messagecontents')
    const changeStream= msgCollection.watch();

    changeStream.on("change",(change)=>{
        console.log("a change occured",change);


        if(change.operationType === 'insert'){
            const messageDetails=change.fullDocument;
            pusher.trigger('messages','inserted',
            {
                name:messageDetails.name,
                message:messageDetails.message,
                timpestamp:messageDetails.timpestamp,
                received: messageDetails.received
            }
            
            );
        } else{
            console.log('Eror trigerring pusher')
        }
    

    
    });
});




//api routes
app.get('/',(req,res)=>res.status(200).send('hello world'));


app.get('/messages/sync',(req,res)=>{
    Messages.find((err,data) => {
        if(err){
            res.status(500).send(err)
        }else{
            res.status(200).send(data)
        }
    })
})

app.post('/messages/new',(req,res)=>{


    const dbMessage =req.body;
    Messages.create(dbMessage,(err,data)=>{
        if(err)
        {
            res.status(500).send(err)
        }else{
            res.status(201).send(`new message created:\n ${data}`)
        }
    });
});

//listen
app.listen(port,()=> console.log(`Listening to localhost:${port}`));

这是我的 package.json 的 server.js

{
    "name": "whatsapp-backend",
    "version": "1.0.0",
    "description": "",
    "main": "server.js",
    "type": "module",
    "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1",
        "start": "node server.js",
        "whatsapp-frontend": "npm start --prefix whatsapp-frontend",
        "dev": "concurrently\"npm run server\" \npm run whatsapp-frontend\"",
        "heroku-postbuild":"NPM_CONFIG_PRODUCTION=false npm install --prefix whatsapp-frontend && npm run build  --prefix whatsapp-frontend"       
    },
    "author": "Nadav Mazuz",
    "license": "ISC",
    "dependencies": {
        "cors": "^2.8.5",
        "express": "^4.17.2",
        "mongoose": "^6.1.3",
        "pusher": "^5.0.0"
    }
}

这是我的index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta name="theme-color" content="#000000" />
    <meta
      name="description"
      content="Web site created using create-react-app"
    />
    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
    <!--
      manifest.json provides metadata used when your web app is installed on a
      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
    -->
    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
    <!--
      Notice the use of %PUBLIC_URL% in the tags above.
      It will be replaced with the URL of the `public` folder during the build.
      Only files inside the `public` folder can be referenced from the HTML.

      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
      work correctly both with client-side routing and a non-root public URL.
      Learn how to configure a non-root public URL by running `npm run build`.
    -->
    <title>React</title>
  </head>
  <body>
    <noscript>You need to enable JavaScript to run this app.</noscript>
    <div id="root"></div>
    <!--
      This HTML file is a template.
      If you open it directly in the browser, you will see an empty page.

      You can add webfonts, meta tags, or analytics to this file.
      The build step will place the bundled scripts into the <body> tag.

      To begin the development, run `npm start` or `yarn start`.
      To create a production bundle, use `npm run build` or `yarn build`.
    -->
  </body>
</html>

这是我的结果：https://immense-waters-47367.herokuapp.com/

感谢协助！

Answer 1

我想你打错了这里应该是/build

app.use(express.static('./whatsapp-frontend/buid'))

此外，如果这不起作用，请查看应用程序根目录中的 heroku-postbuild，看看是否安装了所有内容

在 Heroku 中部署 React 应用程序会得到一个空白页面

deploying react app in Heroku gets a blank page

reactjs

heroku

frontend

backend

heroku-cli