dns.resolve(hostname[, rrtype], callback)
hostname<string> 要解析的主机名。rrtype<string> 资源记录类型。 默认值:'A'。callback<Function>err<Error>records<string[]> | <Object[]> | <Object>
使用域名系统协议将主机名（例如 'nodejs.org'）解析为资源记录数组。
callback 函数有参数 (err, records)。
当成功时，records 将是资源记录数组。
个别结果的类型和结构因 rrtype 而异：
rrtype | records 包含 | 结果的类型 | 快捷方法 |
|---|---|---|---|
'A' | IPv4 地址（默认） | <string> | dns.resolve4() |
'AAAA' | IPv6 地址 | <string> | dns.resolve6() |
'ANY' | 任何记录 | <Object> | dns.resolveAny() |
'CAA' | CA 授权记录 | <Object> | dns.resolveCaa() |
'CNAME' | 规范名称记录 | <string> | dns.resolveCname() |
'MX' | 邮件交换记录 | <Object> | dns.resolveMx() |
'NAPTR' | 名称授权指针记录 | <Object> | dns.resolveNaptr() |
'NS' | 名称服务器记录 | <string> | dns.resolveNs() |
'PTR' | 指针记录 | <string> | dns.resolvePtr() |
'SOA' | 起始规范记录 | <Object> | dns.resolveSoa() |
'SRV' | 服务记录 | <Object> | dns.resolveSrv() |
'TXT' | 文本记录 | <string[]> | dns.resolveTxt() |
hostname<string> Host name to resolve.rrtype<string> Resource record type. Default:'A'.callback<Function>err<Error>records<string[]> | <Object[]> | <Object>
Uses the DNS protocol to resolve a host name (e.g. 'nodejs.org') into an array
of the resource records. The callback function has arguments
(err, records). When successful, records will be an array of resource
records. The type and structure of individual results varies based on rrtype:
rrtype | records contains | Result type | Shorthand method |
|---|---|---|---|
'A' | IPv4 addresses (default) | <string> | dns.resolve4() |
'AAAA' | IPv6 addresses | <string> | dns.resolve6() |
'ANY' | any records | <Object> | dns.resolveAny() |
'CAA' | CA authorization records | <Object> | dns.resolveCaa() |
'CNAME' | canonical name records | <string> | dns.resolveCname() |
'MX' | mail exchange records | <Object> | dns.resolveMx() |
'NAPTR' | name authority pointer records | <Object> | dns.resolveNaptr() |
'NS' | name server records | <string> | dns.resolveNs() |
'PTR' | pointer records | <string> | dns.resolvePtr() |
'SOA' | start of authority records | <Object> | dns.resolveSoa() |
'SRV' | service records | <Object> | dns.resolveSrv() |
'TXT' | text records | <string[]> | dns.resolveTxt() |
On error, err is an Error object, where err.code is one of the
DNS error codes.