Node.js fs.realpath()方法
原文:https://www.geeksforgeeks.org/node-js-fs-realpath-method/
fs.realPath()方法用于计算给定路径的规范路径名。它通过解析路径中的.、..和符号链接来实现。
语法:
fs.realpath( path, options, callback )
参数:该方法接受三个参数，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.
- Callback: is a function that will be called when the method is executed.
- err: If the operation fails, this error will be thrown.
- [T0】 resolved path: 【T1] It is a string or buffer that represents the resolution path.
下面的例子说明了 Node.js 中的 fs.realPath()方法:
示例 1: 本示例使用 fs.realPath()方法获取给定路径的规范路径。
// Node.js program to demonstrate the
// fs.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 + "\\..";
fs.realpath(path1, (error, resolvedPath) => {
if (error) {
console.log(error);
}
else {
console.log("One directory up resolved"
+ " path is: ", resolvedPath);
}
});
// Finding the canonical path
// two directories up
path2 = __dirname + "\\..\\..";
fs.realpath(path2, (error, resolvedPath) => {
if (error) {
console.log(error);
}
else {
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 fs.realPath()方法演示不同的编码类型。
// Node.js program to demonstrate the
// fs.realPath() method
// Import the filesystem module
const fs = require('fs');
path = __dirname + "\\..";
// Getting the canonical path in utf8 encoding
fs.realpath(path, {encoding: "utf8"}, (error, resolvedPath) => {
if (error) {
console.log(error);
}
else {
console.log("The resolved path is:", resolvedPath);
}
});
// Getting the canonical path in hex encoding
fs.realpath(path, {encoding: "hex"}, (error, resolvedPath) => {
if (error) {
console.log(error);
}
else {
console.log("The resolved path is:", resolvedPath);
}
});
// Getting the canonical path in base64 encoding
fs.realpath(path, {encoding: "base64"}, (error, resolvedPath) => {
if (error) {
console.log(error);
}
else {
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:https://nodejs . org/API/fs . html # fs _ fs _ realath _ path _ options _ callback
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