node.js 开发客户端

const http = require('http');

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World\n');
});

server.listen(3000, '127.0.0.1', () => {
  console.log('Server running at http://127.0.0.1:3000/');
});

function asyncOperation() {
  return new Promise((resolve, reject) => {
    setTimeout(() => resolve('Done'), 1000);
  });
}

async function runOperations() {
  try {
    const result = await asyncOperation();
    console.log(result);
  } catch (error) {
    console.error(error);
  }
}

runOperations();

const heapdump = require('heapdump');

// 在需要的时候生成堆快照
heapdump.writeSnapshot('/path/to/snapshot.heapsnapshot');

const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  console.log(`Master ${process.pid} is running`);

  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log(`worker ${worker.process.pid} died`);
  });
} else {
  // Workers can share any TCP connection
  // In this case it is an HTTP server
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('hello world\n');
  }).listen(8000);

  console.log(`Worker ${process.pid} started`);
}