Mô-đun DNS Node.js
Thí dụ
Tra cứu địa chỉ web và viết địa chỉ IP của nó:
var dns = require('dns');
var w3 = dns.lookup('w3schools.com', function
(err, addresses, family) {
console.log(addresses);
});
Định nghĩa và Cách sử dụng
Mô-đun DNS cung cấp một cách thực hiện phân giải tên.
Cú pháp
Cú pháp để bao gồm mô-đun DNS trong ứng dụng của bạn:
var dns = require('dns');
Phương thức DNS
| Method | Description |
|---|---|
| getServers() | Returns an array containing all IP addresses belonging to the current server |
| lookup() | Looks up a hostname. A callback function contains information about the hostname, including it's IP address |
| lookupService() | Looks up a address and port. A callback function contains information about the address, such as the hostname |
| resolve() | Returns an array of record types belonging to the specified hostname |
| resolve4() | Looks up an IPv4 address. The callback function includes an array of IPv4 addresses |
| resolve6() | Looks up an IPv6 address. The callback function includes an array of IPv6 addresses |
| resolveCname() | Looks up CNAME records for the specified hostname. The callback function includes an array of available domains for the hostname |
| resolveMx() | Looks up mail exchange records for the specified hostname. |
| resolveNaptr() | Looks up regular expression based records for the specified hostname. |
| resolveNs() | Looks up name server records for the specified hostname. |
| resolveSoa() | Looks up a start of authority record for the specified hostname. |
| resolveSrv() | Looks up service records for the specified hostname. |
| resolvePtr() | Looks up pointer records for the specified hostname. |
| resolveTxt() | Looks up text query records for the specified hostname. |
| reverse() | Reverses an IP address into an array of hostnames |
| setServers() | Sets the IP addresses of the servers |