dnsPromises.lookupService(address, port)


使用操作系统的底层 getnameinfo 实现将给定的 addressport 解析为主机名和服务。

如果 address 不是有效的 IP 地址,则会抛出 TypeErrorport 将被强制为数字。 如果不是合法的端口,则会抛出 TypeError

当出错时,Promise 使用 Error 对象拒绝,其中 err.code 是错误码。

const dnsPromises = require('node:dns').promises;
dnsPromises.lookupService('127.0.0.1', 22).then((result) => {
  console.log(result.hostname, result.service);
  // 打印: localhost ssh
});

Resolves the given address and port into a host name and service using the operating system's underlying getnameinfo implementation.

If address is not a valid IP address, a TypeError will be thrown. The port will be coerced to a number. If it is not a legal port, a TypeError will be thrown.

On error, the Promise is rejected with an Error object, where err.code is the error code.

const dnsPromises = require('node:dns').promises;
dnsPromises.lookupService('127.0.0.1', 22).then((result) => {
  console.log(result.hostname, result.service);
  // Prints: localhost ssh
});