Heroku总是启动"npm“，甚至从Procfile和特定的web进程开始。

web: npm start

web: node index.js

{
  "scripts": {
    "start": "node index.js"
  }
}

heroku plugins:install heroku-repo
heroku repo:purge_cache -a your-app-name
git commit --allow-empty -m "Purge cache"
git push heroku main

heroku logs --tail

my-app/
├── Procfile
├── package.json
└── index.js

web: node index.js

{
  "name": "my-app",
  "version": "1.0.0",
  "scripts": {
    "start": "node index.js"
  },
  "dependencies": {
    "express": "^4.17.1"
  }
}

const express = require('express');
const app = express();
const port = process.env.PORT || 3000;

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.listen(port, () => {
  console.log(`App listening at http://localhost:${port}`);
});