common method
fs.access(): Check if the file exists and Node.js has permission to access it.fs.appendFile(): Append data to the file. If the file does not exist, the file is created.fs.chmod(): Change the permissions of the file (specified by the passed in filename). Related methods:fs.lchmod(),fs.fchmod().fs.chown(): Change the owner and group of a file (specified by the passed in filename). Related methods:fs.fchown(),fs.lchown().fs.close(): Close the file descriptor.fs.copyFile(): Copy files.fs.createReadStream(): Create a readable file stream.fs.createWriteStream(): Create a writable file stream.fs.mkdir(): new folder.fs.mkdtemp(): Create a temporary directory.fs.rm(): Delete files and directories can also be deleted.fs.rmdir(): Delete folder.fs.rename(): Rename/move a file or folder.fs.open(): Set the file mode.fs.readdir(): Read the contents of the directory.fs.readFile(): Read the contents of the file. Related method: fs.read().fs.readlink(): Read the value of a symbolic link.fs.realpath(): Resolve relative file path pointers (…) to full paths.fs.stat(): Returns the status of the file (specified by the passed file name), which can be used to determine whether the file exists. Related methods:fs.fstat(),fs.lstat().fs.symlink(): Create a symbolic link to the file.fs.truncate(): Truncate the file identified by the passed filename to the specified length. Related methods:fs.ftruncate().fs.link(): Create a new hard link pointing to the file.fs.unlink(): Delete a file or symbolic link.fs.unwatchFile(): Stop watching for changes on the file.fs.utimes(): Change the timestamp of the file (specified by the passed in filename). Related methods:fs.futimes().fs.watchFile(): Start watching for changes on the file. Related method: fs.watch().fs.writeFile(): Write data to a file. Related method: fs.write().
Example of use
Check if a file/directory exists
usefs.access
// 判断文件/目录 是否存在
fs.access('./data', fs.constants.F_OK, err => {
console.log(`${
err ? '不存在' : '存在'}`);
})
// 判断文件是否可读
fs.access(file, constants.R_OK, (err) => {
console.log(`${
file} ${
err ? '不可读' : '可读'}`);
});
// 判断文件是否可写
fs.access(file, constants.W_OK, (err) => {
console.log(`${
file} ${
err ? '不可写' : '可写'}`);
});
usefs.stat()
fs.stat('./data', (err, stats) => {
if (err) console.log('文件/目录不存在')
// 不存在时，stats 为 undefined
console.log('stats:', stats)
})
Create a directory
Create a first-level folder, and multiple levels will report an error
fs.mkdir('./data', err => {
if (err) throw err
})
Create multi-level directories
fs.mkdir('./data/test/test', {
recursive: true }, err => {
if (err) throw err
})
delete directory
Delete the specified folder, and the folder must be empty
fs.rmdir('./data', err => {
if (err) throw err
})
Delete a directory, including all folders and files under the directory
fs.rmdir('./data/test', {
recursive: true }, err => {
if (err) throw err
})
Same effect as above
fs.rm('./data/test', {
recursive: true }, err => {
if (err) throw err
})
Delete Files
usefs.unlink
fs.unlink('./data/test.txt', err => {
if (err) throw err
})
usefs.rm
fs.rm('./data/test.txt', err => {
if (err) throw err
})