我正在运行一个使用 express 作为后端的反应应用程序。我按照本教程介绍了如何连接两者然后部署到heroku。简而言之，我按照说明在端口 5000 上运行 express，并在客户端的包 json 代理到端口 5000。从服务器端我运行一个名为并发的 npm 工具，它同时运行。
现在的问题是 npm run build 似乎只工作了一半。页面在端口 5000 上加载一瞬间（在运行构建之前，我将使用端口 3000）消失，只留下我的自定义背景颜色。我看不到服务器端或反应应用程序端的错误。
我尝试更改服务器的端口号，首先认为这是serve -s build在端口 5000 上运行应用程序的问题，这可能会发生冲突，但同样的问题仍然存在。
请让我知道什么代码如果我可以显示任何代码来帮助诊断，因为恐怕我不知道除了我的文件布局之外要呈现什么（请参阅教程的链接我有相同的整体布局），下面将是我的包 jsons分别是客户端和服务器。
客户端包.json：
"name": "friftr_version_2_0",
"version": "2.0.0",
"description": "Friftr, but its in react",
"main": "index.js",
"author": "V1llage_ID10T",
"license": "ISC",
"dependencies": {
"@material-ui/core": "^4.9.8",
"@material-ui/icons": "^4.9.1",
"axios": "^0.19.2",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-lazy-load-image-component": "^1.4.1",
"react-router-dom": "^5.1.2",
"react-router-page-transition": "^3.1.0",
"react-scripts": "^3.4.1",
"typescript": "^3.8.3"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
},
"proxy": "http://localhost:3001",
"browserslist": [
">0.2%",
"not dead",
"not ie <= 11",
"not op_mini all"
]
}
服务器包.json
{
"name": "friftr2",
"version": "2.0.0",
"description": "friftr redesign in express, react, material-ui, mongoose database. ",
"main": "server.js",
"repository": {
"type": "git",
"url": "git+https://github.com/n/a.git"
},
"author": "V1LLAGE_ID10T",
"license": "ISC",
"bugs": {
"url": "https://github.com/n/a/issues"
},
"homepage": "https://github.com/n/a#readme",
"dependencies": {
"axios": "^0.19.2",
"body-parser": "^1.19.0",
"cheerio": "^1.0.0-rc.3",
"concurrently": "^5.1.0",
"connect-mongo": "^3.2.0",
"cors": "^2.8.5",
"dotenv": "^8.2.0",
"express": "^4.17.1",
"express-session": "^1.17.0",
"got": "^10.6.0",
"hsts": "^2.2.0",
"http-proxy-middleware": "^1.0.1",
"mongo-sanitize": "^1.1.0",
"mongoose": "^5.9.3",
"mongoose-findorcreate": "^3.0.0",
"node-fetch": "^2.6.0",
"nodemon": "^2.0.2",
"passport": "^0.4.1",
"passport-google-oauth20": "^2.0.0",
"passport-local-mongoose": "^6.0.1",
"tall": "^3.0.0"
},
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"client-install": "cd client && npm install",
"start": "node server.js",
"server": "nodemon server.js",
"client": "npm start --prefix client",
"dev": "concurrently \"npm run server\" \"npm run client\""
}
}