Node.js fsPromises.realpath()方法

原文:https://www . geesforgeks . org/node-js-fspromiss-real path-method/

fsPromises.realPath() 方法使用与 fs.realpath.native() 函数相同的语义来确定路径的实际位置，然后用解析后的路径解析 Promise。仅支持可转换为 UTF8 字符串的路径。

语法:

fsPromises.realpath( path, options )

参数:该方法接受两个参数，如上所述，如下所述:

• Path: Save the directory path to be resolved. It can be a string, a buffer or a web address.
• Option: is a string or object that can be used to specify optional parameters that affect the operation. It has an optional parameter:
  • Code: It is a string that defines the parsing path code.

下面的例子说明了 fs。Node.js 中的 promisresealpath()方法:

示例 1: 本示例使用 fsPromises.realPath() 方法获取给定路径的规范路径。

Node.js

// Node.js program to demonstrate the 
// fsPromises.realPath() method 

// Import the filesystem module 
const fs = require('fs'); 

console.log("Current Directory Path: ", __dirname); 

// Finding the canonical path 
// one directory up 
path1 = __dirname + "\\.."; 

fsPromises.realpath(path1, (error, resolvedPath)) 
    console.log("One directory up resolved"
      + " path is: ", resolvedPath); 

// Finding the canonical path 
// two directories up 
path2 = __dirname + "\\..\\.."; 

fsPromises.realpath(path2, (resolvedPath)) 

    console.log("Two directories up resolved"
          + " path is:", resolvedPath); 

输出:

Current Directory Path: G:\tutorials\nodejs-fs-realPath
Two directories up resolved path is: G:\
One directory up resolved path is: G:\tutorials

示例 2: 本示例使用 fsPromises.realPath() 方法演示不同的编码类型。

node . js

// Node.js program to demonstrate the 
// fsPromises.realPath() method 

// Import the filesystem module 
const fs = require('fs'); 

path = __dirname + "\\.."; 

// Getting the canonical path in utf8 encoding 
fsPromises.realpath(path, {encoding: "utf8"})
console.log("The resolved path is:", resolvedPath); 

// Getting the canonical path in hex encoding 
fsPromises.realpath(path, {encoding: "hex"}) 
console.log("The resolved path is:", resolvedPath); 

// Getting the canonical path in base64 encoding 
fsPromises.realpath(path, {encoding: "base64"})
console.log("The resolved path is:", resolvedPath); 

输出:

The resolved path is: G:\tutorials
The resolved path is: 473a5c7475746f7269616c73
The resolved path is: RzpcdHV0b3JpYWxz

参考资料:https://nodejs . org/API/fs . html # fs _ fspromises _ realpath _ options

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