dns.resolveNaptr(hostname, callback)

• hostname <string>
• callback <Function>
  • err <Error>
  • addresses <Object[]>

使用域名系统协议为 hostname 解析基于正则表达式的记录（NAPTR 记录）。 传给 callback 函数的 addresses 参数将包含具有以下属性的对象数组：

• flags
• service
• regexp
• replacement
• order
• preference

{
  flags: 's',
  service: 'SIP+D2U',
  regexp: '',
  replacement: '_sip._udp.example.com',
  order: 30,
  preference: 100
}

• hostname <string>
• callback <Function>
  • err <Error>
  • addresses <Object[]>

Uses the DNS protocol to resolve regular expression-based records (NAPTR records) for the hostname. The addresses argument passed to the callback function will contain an array of objects with the following properties:

• flags
• service
• regexp
• replacement
• order
• preference

{
  flags: 's',
  service: 'SIP+D2U',
  regexp: '',
  replacement: '_sip._udp.example.com',
  order: 30,
  preference: 100
}