Node.js fs.readdirSync()方法
原文:https://www . geesforgeks . org/node-js-fs-readdirsync-method/
fs.readdirSync()方法用于同步读取给定目录的内容。方法返回一个包含目录中所有文件名或对象的数组。options 参数可用于更改从方法返回文件的格式。
语法:
fs.readdirSync( path, options )
参数:这个方法接受两个参数，如上所述，如下所述:
- Path: It stores the path of the directory from which the content must be read. It can be a string, a buffer or a web address.
- Option: is an object that can be used to specify optional parameters that affect the method. It has two optional parameters:
- Encoding: It is a string value that specifies which encoding is used for the file name of the callback parameter. The default value is utf8.
- with file type: is a Boolean value that specifies whether the file is returned as a file system. Direct object. The default value is false.
返回:返回字符串、缓冲区或 fs 的数组。包含目录中文件的目录对象。
下面的例子说明了 Node.js 中的 fs.readdirSync()方法:
示例 1: 本示例使用 fs.readdirSync()方法返回目录中的文件名或文件对象。
// Node.js program to demonstrate the
// fs.readdirSync() method
// Import the filesystem module
const fs = require('fs');
// Function to get current filenames
// in directory
filenames = fs.readdirSync(__dirname);
console.log("\nCurrent directory filenames:");
filenames.forEach(file => {
console.log(file);
});
// Function to get current filenames
// in directory with "withFileTypes"
// set to "true"
fileObjs = fs.readdirSync(__dirname, { withFileTypes: true });
console.log("\nCurrent directory files:");
fileObjs.forEach(file => {
console.log(file);
});
输出:
Current directory filenames:
CONTRUBUTIONS.txt
index.html
index.js
package.json
README.md
Current directory files:
Dirent { name: 'CONTRUBUTIONS.txt', [Symbol(type)]: 1 }
Dirent { name: 'index.html', [Symbol(type)]: 1 }
Dirent { name: 'index.js', [Symbol(type)]: 1 }
Dirent { name: 'package.json', [Symbol(type)]: 1 }
Dirent { name: 'README.md', [Symbol(type)]: 1 }
示例 2: 本示例使用 fs.readdirSync()方法只返回带有“.”的文件名。md "分机。
// Node.js program to demonstrate the
// fs.readdirSync() method
// Import the filesystem module
const fs = require('fs');
const path = require('path');
// Function to get current filenames
// in directory with specific extension
files = fs.readdirSync(__dirname);
console.log("\Filenames with the .md extension:");
files.forEach(file => {
if (path.extname(file) == ".md")
console.log(file);
})
输出:
Filenames with the .md extension:
README.md
参考:https://nodejs . org/API/fs . html # fs _ fs _ readdirsync _ path _ options
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