使用 JavaScript/nodejs 计算目录中的文件数？
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Count the number of files in a directory using JavaScript/nodejs?
提问by Marvin Danig
How can I count the number of files in a directory using nodejswith just plain JavaScript or packages? I want to do something like this:
如何nodejs仅使用纯 JavaScript 或包来计算目录中的文件数？我想做这样的事情：
How to count the number of files in a directory using Python
Or in bash script I'd do this:
或者在 bash 脚本中我会这样做：
getLength() {
DIRLENGTH=1
until [ ! -d "DIR-$((DIRLENGTH+1))" ]; do
DIRLENGTH=$((DIRLENGTH+1))
done
}
回答by Andy Hoffman
回答by DrakaSAN
Alternative solution without external module, maybe not the most efficient code, but will do the trick without external dependency:
没有外部模块的替代解决方案，可能不是最有效的代码，但可以在没有外部依赖的情况下做到这一点：
var fs = require('fs');
function sortDirectory(path, files, callback, i, dir) {
if (!i) {i = 0;} //Init
if (!dir) {dir = [];}
if(i < files.length) { //For all files
fs.lstat(path + '\' + files[i], function (err, stat) { //Get stats of the file
if(err) {
console.log(err);
}
if(stat.isDirectory()) { //Check if directory
dir.push(files[i]); //If so, ad it to the list
}
sortDirectory(callback, i + 1, dir); //Iterate
});
} else {
callback(dir); //Once all files have been tested, return
}
}
function listDirectory(path, callback) {
fs.readdir(path, function (err, files) { //List all files in the target directory
if(err) {
callback(err); //Abort if error
} else {
sortDirectory(path, files, function (dir) { //Get only directory
callback(dir);
});
}
})
}
listDirectory('C:\My\Test\Directory', function (dir) {
console.log('There is ' + dir.length + ' directories: ' + dir);
});
回答by Marin Takanov
1) Download shell.js and node.js (if you don't have it)
2) Go where you download it and create there a file named countFiles.js
1) 下载 shell.js 和 node.js (如果你没有的话)
2) 去你下载它的地方并在那里创建一个名为的文件countFiles.js
var sh = require('shelljs');
var count = 0;
function annotateFolder (folderPath) {
sh.cd(folderPath);
var files = sh.ls() || [];
for (var i=0; i<files.length; i++) {
var file = files[i];
if (!file.match(/.*\..*/)) {
annotateFolder(file);
sh.cd('../');
} else {
count++;
}
}
}
if (process.argv.slice(2)[0])
annotateFolder(process.argv.slice(2)[0]);
else {
console.log('There is no folder');
}
console.log(count);
3) Open the command promt in the shelljs folder (where countFiles.js is) and write node countFiles "DESTINATION_FOLDER"(e.g. node countFiles "C:\Users\MyUser\Desktop\testFolder")
3）在shelljs文件夹（countFiles.js所在的位置）中打开命令提示符并写入node countFiles "DESTINATION_FOLDER"（例如node countFiles "C:\Users\MyUser\Desktop\testFolder"）
回答by Vidya Kabber
Here the simple code,
这里是简单的代码，
import RNFS from 'react-native-fs';
RNFS.readDir(dirPath)
.then((result) => {
console.log(result.length);
});
回答by Abhishek Vispute
const readdir = (path) => {
return new Promise((resolve, reject) => {
fs.readdir(path, (error, files) => {
error ? reject(error) : resolve(files);
});
});
};s
readdir("---path to directory---").then((files) => {
console.log(files.length);
});
回答by Marvin Danig
Okay, I got a bash script like approach for this:
好的，我有一个类似 bash 脚本的方法：
const shell = require('shelljs')
const path = require('path')
module.exports.count = () => shell.exec(`cd ${path.join('path', 'to', 'folder')} || exit; ls -d -- */ | grep 'page-*' | wc -l`, { silent:true }).output
That's it.
就是这样。
