Node.js dns.resolvePtr()方法

原文:https://www . geesforgeks . org/node-js-DNS-resolveptr-method/

dns.resolvePtr()方法是 dns 模块的内置应用编程接口，用于使用 dns 协议解析指定主机名的 Ptr 或指针记录。

语法:

dns.resolvePtr( hostname, callback )

参数:该方法有两个参数，如上所述，如下所述:

  • Hostname: This parameter specifies a string that represents the hostname to be resolved.
  • Callback: Specifies the function to be called after DNS resolution of the host name.
    • Error: The specified generation error.
    • Address: is a string array, indicating the returned record of the host name pointer.

返回值:此方法返回错误，通过回调函数寻址。这些数据作为参数传递给回调函数。

以下示例说明了 dns.resolvePtr()的使用；节点. js 中的方法:

例 1:

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

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

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

输出:

PTR records:[{"34.218.62.116"}]

例 2:

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

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

// Calling dns.resolvePtr() method for hostname
// google.com and displaying them in
// console as a callback
dns.resolvePtr('google.com', (err, 
    addresses) => console.log('PTR records: %j', addresses));

输出:

PTR records:[{"172.217.164.142"}]

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 _ resolveptr _ hostname _ callback

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