如何在nodejs上使用eventSource

npm init -y

npm install express

const express = require('express');
const app = express();

app.get('/events', (req, res) => {
  res.setHeader('Content-Type', 'text/event-stream');
  res.setHeader('Cache-Control', 'no-cache');
  res.setHeader('Connection', 'keep-alive');
  res.flushHeaders();

  const sendEvent = (data) => {
    res.write(`data: ${data}\n\n`);
  };

  // 模拟每秒发送一个事件
  setInterval(() => {
    const eventData = 'This is an event.';
    sendEvent(eventData);
  }, 1000);
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

node server.js