dns.resolve4(hostname[, options], callback)

版本历史

版本	变更
v7.2.0	此方法现在支持传入 `options`，特别是 `options.ttl`。
v0.1.16	新增于: v0.1.16

hostname <string> 要解析的主机名。
options <Object>
- ttl <boolean> 检索每条记录的生存时间值 (TTL)。当为 true 时，回调接收 { address: '1.2.3.4', ttl: 60 } 对象数组而不是字符串数组，TTL 以秒表示。
callback <Function>
- err <Error>
- addresses <string[]> | <Object[]>

使用域名系统协议为 hostname 解析 IPv4 地址（A 记录）。传给 callback 函数的 addresses 参数将包含 IPv4 地址的数组（例如 ['74.125.79.104', '74.125.79.105', '74.125.79.106']）。

History

Version	Changes
v7.2.0	This method now supports passing `options`, specifically `options.ttl`.
v0.1.16	Added in: v0.1.16

hostname <string> Host name to resolve.
options <Object>
- ttl <boolean> Retrieve the Time-To-Live value (TTL) of each record. When true, the callback receives an array of { address: '1.2.3.4', ttl: 60 } objects rather than an array of strings, with the TTL expressed in seconds.
callback <Function>
- err <Error>
- addresses <string[]> | <Object[]>

Uses the DNS protocol to resolve a IPv4 addresses (A records) for the hostname. The addresses argument passed to the callback function will contain an array of IPv4 addresses (e.g. ['74.125.79.104', '74.125.79.105', '74.125.79.106']).