Node.js fs.realpathSync()用法及代碼示例

fs.realpathSync()方法用於同步計算給定路徑的規範路徑名。它通過解決.，..以及路徑中的符號鏈接並返回已解析的路徑。

用法:

fs.realpathSync( path, options )

參數：此方法接受上述和以下所述的兩個參數：

path:它包含必須解析的目錄的路徑。它可以是字符串，緩衝區或URL。
options:它是一個字符串或對象，可用於指定將影響操作的可選參數。它具有一個可選參數：
- encoding:它是一個字符串，用於定義解析路徑的編碼。

返回值：它返回一個代表解析路徑的字符串或緩衝區。

以下示例說明了Node.js中的fs.realpathSync()方法：

範例1：

// Node.js program to demonstrate the 
// fs.realpathSync() method 
  
// Import the filesystem module 
const fs = require('fs'); 
  
console.log("Current Directory Path:", __dirname); 
  
// Finding the canonical path 
// one directory up 
path1 = __dirname + "\\.."; 
  
resolvedPath = fs.realpathSync(path1); 
console.log("One directory up resolved path is:", 
             resolvedPath); 
  
// Finding the canonical path 
// two directories up 
path2 = __dirname + "\\..\\.."; 
  
resolvedPath = fs.realpathSync(path2); 
console.log("Two directories up resolved path is:", 
             resolvedPath);

輸出：

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

範例2：

// Node.js program to demonstrate the 
// fs.realpathSync() method 
  
// Import the filesystem module 
const fs = require('fs'); 
  
path = __dirname + "\\.."; 
  
// Getting the canonical path is utf8 encoding 
resolvedPath = fs.realpathSync(path, { encoding:"utf8" }); 
console.log("The resolved path is:", resolvedPath); 
  
// Getting the canonical path is hex encoding 
resolvedPath = fs.realpathSync(path, { encoding:"hex" }); 
console.log("The resolved path is:", resolvedPath); 
  
// Getting the canonical path is base64 encoding 
resolvedPath = fs.realpathSync(path, { encoding:"base64" }); 
console.log("The resolved path is:", resolvedPath);

輸出：

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

參考： https://nodejs.org/api/fs.html#fs_fs_realpathsync_path_options

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