dnsPromises.lookupService(address, port)

• address <string>
• port <number>

使用操作系统的底层 getnameinfo 实现，将给定的 address 和 port 解析为主机名和服务。

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

如果 address 不是有效的 IP 地址，将会抛出 TypeError。port 会被强制转换为数字。如果它不是合法的端口，将会抛出 TypeError。

【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.】

出现错误时，Promise 会被 Error 对象拒绝，其中 err.code 是错误代码。

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

import dnsPromises from 'node:dns/promises';
const result = await dnsPromises.lookupService('127.0.0.1', 22);

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