如果目录不存在,下面的方法是否正确?
它应该对脚本具有完全的权限,并且其他人可以阅读。
var dir = __dirname + '/upload';
if (!path.existsSync(dir)) {
fs.mkdirSync(dir, 0744);
}
如果目录不存在,下面的方法是否正确?
它应该对脚本具有完全的权限,并且其他人可以阅读。
var dir = __dirname + '/upload';
if (!path.existsSync(dir)) {
fs.mkdirSync(dir, 0744);
}
当前回答
如果子目录不存在,我必须创建子目录。我用了这个:
const path = require('path');
const fs = require('fs');
function ensureDirectoryExists(p) {
//console.log(ensureDirectoryExists.name, {p});
const d = path.dirname(p);
if (d && d !== p) {
ensureDirectoryExists(d);
}
if (!fs.existsSync(d)) {
fs.mkdirSync(d);
}
}
其他回答
单行版本:
// Or in TypeScript: import * as fs from 'fs';
const fs = require('fs');
!fs.existsSync(dir) && fs.mkdirSync(dir);
解决方案
CommonJS
const fs = require('fs');
const path = require('path');
const dir = path.resolve(path.join(__dirname, 'upload');
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir);
}
// OR
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir, {
mode: 0o744, // Not supported on Windows. Default: 0o777
});
}
ESM
更新您的包。Json文件配置
{
// declare using ECMAScript modules(ESM)
"type": "module",
//...
}
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
// create one custom `__dirname`, because it does not exist in es-module env ⚠️
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const dir = path.resolve(path.join(__dirname, 'upload');
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir);
}
// OR
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir, {
mode: 0o744, // Not supported on Windows. Default: 0o777
});
}
更新2022
import { existsSync } from 'node:fs';
refs
NodeJS版本:v18.2.0
https://nodejs.org/api/fs.html#fsexistssyncpath
https://nodejs.org/api/fs.html#fsmkdirsyncpath-options
https://nodejs.org/api/url.html#urlfileurltopathurl
https://github.com/nodejs/help/issues/2907#issuecomment-757446568
ESM: ECMAScript模块
https://nodejs.org/api/esm.html#introduction
使用Node.js 10 + ES6:
import path from 'path';
import fs from 'fs';
(async () => {
const dir = path.join(__dirname, 'upload');
try {
await fs.promises.mkdir(dir);
} catch (error) {
if (error.code === 'EEXIST') {
// Something already exists, but is it a file or directory?
const lstat = await fs.promises.lstat(dir);
if (!lstat.isDirectory()) {
throw error;
}
} else {
throw error;
}
}
})();
从文档中可以看出,这是你异步(和递归)做这件事的方式:
const fs = require('fs');
const fsPromises = fs.promises;
fsPromises.access(dir, fs.constants.F_OK)
.catch(async() => {
await fs.mkdir(dir, { recursive: true }, function(err) {
if (err) {
console.log(err)
}
})
});
如果文件夹存在,您可以使用mkdir并捕获错误。 这是异步的(因此是最佳实践)并且安全。
fs.mkdir('/path', err => {
if (err && err.code != 'EEXIST') throw 'up'
.. safely do your stuff here
})
(可选地使用mode添加第二个参数。)
其他的想法:
You could use then or await by using native promisify. const util = require('util'), fs = require('fs'); const mkdir = util.promisify(fs.mkdir); var myFunc = () => { ..do something.. } mkdir('/path') .then(myFunc) .catch(err => { if (err.code != 'EEXIST') throw err; myFunc() }) You can make your own promise method, something like (untested): let mkdirAsync = (path, mode) => new Promise( (resolve, reject) => mkdir (path, mode, err => (err && err.code !== 'EEXIST') ? reject(err) : resolve() ) ) For synchronous checking, you can use: fs.existsSync(path) || fs.mkdirSync(path) Or you can use a library, the two most popular being mkdirp (just does folders) fsextra (supersets fs, adds lots of useful stuff)