异步域名解析

const dns = require('dns');

function resolveDomainAsync(domain) {
  return new Promise((resolve, reject) => {
    dns.resolve(domain, (err, addresses) => {
      if (err) {
        reject(err);
      } else {
        resolve(addresses);
      }
    });
  });
}

async function main() {
  try {
    const addresses = await resolveDomainAsync('example.com');
    console.log(addresses);
  } catch (error) {
    console.error('Error resolving domain:', error);
  }
}

main();

const dns = require('dns');

function resolveDomainAsync(domain, timeout = 5000) {
  return new Promise((resolve, reject) => {
    const timeoutId = setTimeout(() => {
      reject(new Error('DNS resolution timed out'));
    }, timeout);

    dns.resolve(domain, (err, addresses) => {
      clearTimeout(timeoutId);
      if (err) {
        reject(err);
      } else {
        resolve(addresses);
      }
    });
  });
}

async function main() {
  try {
    const addresses = await resolveDomainAsync('example.com');
    console.log(addresses);
  } catch (error) {
    console.error('Error resolving domain:', error);
  }
}

main();