dnsPromises.resolveNaptr(hostname)

• hostname <string>

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）。 当成功时，Promise 使用具有以下属性的对象数组进行解决：

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

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

• hostname <string>

Uses the DNS protocol to resolve regular expression-based records (NAPTR records) for the hostname. On success, the Promise is resolved with 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
}