Node.js dns.resolve6()方法

原文:https://www.geeksforgeeks.org/node-js-dns-resolve6-method/

dns.resolve6()方法是 dns 模块的内置应用程序编程接口，用于使用 dns 协议解析指定主机名的 IPv6 地址(“AAAA”记录)。

语法:

dns.resolve6( hostname, options, callback )

参数:该方法接受三个参数，如上所述，如下所述:

  • Hostname: This parameter specifies a string that represents the hostname to be resolved.
  • Option: It is the form of an object.
    • ttl: It is a Boolean parameter that specifies whether to retrieve the time-to-live value (TTL) of each record. If set to true, TTL (in seconds) of each record will be retrieved.
  • Callback: Specify the function to be called after DNS resolution of the host name.
    • Error: The specified generation error.
    • Address: It is a string or object that represents the IPv6 address returned for the host name.

返回值:该方法通过回调函数返回 IPv6 地址。这些数据作为参数传递给回调函数。

下面的例子说明了 dns.resolve6()方法在 Node.js 中的使用:

例 1:

// Node.js program to demonstrate the   
// dns.resolve6() method

// Accessing dns module
const dns = require('dns');

// Calling dns.resolve6() method for hostname
// geeksforgeeks.org and displaying them in
// console as a callback
dns.resolve6('geeksforgeeks.org', (err, 
    address) => console.log('address: %j', address));

输出:

address: ["fd00:0:14:13::22da:3e74"]

例 2:

// Node.js program to demonstrate the   
// dns.resolve6() method

// Accessing dns module
const dns = require('dns');

// Set the options for dns.resolve6() method
const options = {
    ttl : true
};

// Calling dns.resolve6() method for hostname
// geeksforgeeks.org and displaying them in
// console as a callback
dns.resolve6('geeksforgeeks.org', options, (err, 
    address) => console.log('address: %j', address));

输出:

address: [{"address":"fd00:0:14:13::22da:3e74", "ttl":30}]

注意:以上程序使用node index.js命令编译运行。

参考:https://nodejs . org/API/DNS . html # DNS _ DNS _ resolve 6 _ hostname _ options _ callback

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