在 Heroku 中部署 React 应用程序会得到一个空白页面

Question

my problem is when I try to use Heroku open after I was deployed my react app I get a blank page with the same title in my index.html, what I am trying to do is deploy my app to Heroku the backend and the frontend, when I run it locally it's works我的问题是当我在部署我的反应应用程序后尝试使用 Heroku 打开时，我在我的索引中得到一个具有相同标题的空白页面。html，我想要做的是将我的应用程序部署到 Heroku 后端和前端，当我在本地运行它时它可以工作

server.js服务器.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}`));

this is my package.json of server.js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"
    }
}

this is my index.html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>

and here is my result: https://immense-waters-47367.herokuapp.com/这是我的结果： https://immense-waters-47367.herokuapp.com/

thanks for the assistance!感谢您的协助！

Answer 1

I think you made a typo here should be /build我想你打错了这里应该是 /build

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

Also, if that doesn't work then look into your heroku-postbuild in the root of app and see if thats installing everything另外，如果这不起作用，那么在应用程序的根目录中查看你的heroku-postbuild ，看看是否安装了所有东西

在 Heroku 中部署 React 应用程序会得到一个空白页面

问题描述

1 个解决方案

解决方案1
1 已采纳 2022-05-29 20:17:44

在 Heroku 中部署 React 应用程序会得到一个空白页面

问题描述

1 个解决方案

解决方案1 1 已采纳 2022-05-29 20:17:44

解决方案1
1 已采纳 2022-05-29 20:17:44