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
}