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在NodeJS中,dns.resolve*()方法用于解析域名,返回对应的IP地址或者主机名。它的每一个参数的具体用法如下:

  1. dns.resolve4():解析IPv4地址

  2. dns.resolve6():解析IPv6地址

  3. dns.resolveCname():解析CNAME记录

  4. dns.resolveMx():解析MX记录

  5. dns.resolveNs():解析NS记录

  6. dns.resolveTxt():解析TXT记录

  7. dns.resolveSrv():解析SRV记录

  8. dns.resolvePtr():解析PTR记录

下面是一些具体的应用场景和代码示例:

  1. 解析IPv4地址:

const dns = require('dns');

dns.resolve4('www.google.com', (err, addresses) => {
  if (err) throw err;

  console.log('IPv4 addresses:', addresses);
});

输出结果:

IPv4 addresses: [ '172.217.3.100' ]
  1. 解析CNAME记录:

const dns = require('dns');

dns.resolveCname('www.github.com', (err, addresses) => {
  if (err) throw err;

  console.log('CNAME addresses:', addresses);
});

输出结果:

CNAME addresses: [ 'github.com' ]
  1. 解析MX记录:

const dns = require('dns');

dns.resolveMx('google.com', (err, addresses) => {
  if (err) throw err;

  console.log('MX addresses:', addresses);
});

输出结果:

MX addresses: [ { priority: 10, exchange: 'aspmx.l.google.com' },
  { priority: 20, exchange: 'alt1.aspmx.l.google.com' },
  { priority: 30, exchange: 'alt2.aspmx.l.google.com' },
  { priority: 40, exchange: 'alt3.aspmx.l.google.com' },
  { priority: 50, exchange: 'alt4.aspmx.l.google.com' } ]

通过以上示例,可以看到dns.resolve*()方法在实际开发中的用法和应用场景。