Node.js fs.fstatSync()方法

原文:https://www.geeksforgeeks.org/node-js-fs-fstatsync-method/

fs.fstatSync()方法用于同步返回给定文件描述符的信息。fs。Stat 对象返回几个字段和方法来获取文件的更多细节。

语法:

fstatSync( fd, options )

参数:该方法接受两个参数，如上所述，如下所述:

• [FD: It is an integer value that represents the file descriptor used by this method.
• Option: is an object that can be used to specify optional parameters that affect output. It has an optional parameter:
  • bigint: It is a Boolean value that specifies whether the value returned in fs is. The Stats object is bigint. The default value is false.

以下示例说明了 Node.js 中的 fs.fstatSync()方法:

示例 1: 本示例使用 fs.fstatSync()方法获取文件和目录的详细信息。

// Node.js program to demonstrate the
// fs.fstatSync() method

// Import the filesystem module
const fs = require('fs');

const file_fd = fs.openSync('example_file.txt', 'r');

// Getting information for a file
let fileStat = fs.fstatSync(file_fd);

console.log("Stats object for: example_file.txt");
console.log(fileStat);

// Using methods of the Stats object
console.log("Path is file:", fileStat.isFile());
console.log("Path is directory:", fileStat.isDirectory());

const dir_fd = fs.openSync('example_directory', 'r');

// Getting information for a directory
let dirStat = fs.fstatSync(dir_fd);

console.log("Stats object for: example_directory");
console.log(dirStat);

// Using methods of the Stats object
console.log("Path is file:", dirStat.isFile());
console.log("Path is directory:", dirStat.isDirectory());

输出:

Stats object for: example_file.txt
Stats {
  dev: 3229478529,
  mode: 33206,
  nlink: 1,
  uid: 0,
  gid: 0,
  rdev: 0,
  blksize: 4096,
  ino: 281474976780786,
  size: 0,
  blocks: 0,
  atimeMs: 1584961030299.117,
  mtimeMs: 1582209885466.6848,
  ctimeMs: 1582209885466.6848,
  birthtimeMs: 1584961030299.117,
  atime: 2020-03-23T10:57:10.299Z,
  mtime: 2020-02-20T14:44:45.467Z,
  ctime: 2020-02-20T14:44:45.467Z,
  birthtime: 2020-03-23T10:57:10.299Z
}
Path is file: true
Path is directory: false
Stats object for: example_directory
Stats {
  dev: 3229478529,
  mode: 16822,
  nlink: 1,
  uid: 0,
  gid: 0,
  rdev: 0,
  blksize: 4096,
  ino: 281474976780789,
  size: 0,
  blocks: 0,
  atimeMs: 1584961090214.9436,
  mtimeMs: 1581074249467.7114,
  ctimeMs: 1584961030324.12,
  birthtimeMs: 1584961030324.12,
  atime: 2020-03-23T10:58:10.215Z,
  mtime: 2020-02-07T11:17:29.468Z,
  ctime: 2020-03-23T10:57:10.324Z,
  birthtime: 2020-03-23T10:57:10.324Z
}
Path is file: false
Path is directory: true

示例 2: 本示例使用 fs.fstatSync()方法获取带有或不带有 bigint 选项的文件的详细信息。

// Node.js program to demonstrate the
// fs.fstatSync() method

// Import the filesystem module
const fs = require('fs');

const file_fd = fs.openSync('example_file.txt', 'r');

let fileStat = fs.fstatSync(file_fd);
console.log(fileStat);

// Using the bigint option to return
// the values in big integer format
let fileBigIntStat = fs.fstatSync(file_fd, { bigint: true });
console.log(fileBigIntStat);

输出:

Stats {
  dev: 3229478529,
  mode: 33206,
  nlink: 1,
  uid: 0,
  gid: 0,
  rdev: 0,
  blksize: 4096,
  ino: 281474976780786,
  size: 0,
  blocks: 0,
  atimeMs: 1584961030299.117,
  mtimeMs: 1582209885466.6848,
  ctimeMs: 1582209885466.6848,
  birthtimeMs: 1584961030299.117,
  atime: 2020-03-23T10:57:10.299Z,
  mtime: 2020-02-20T14:44:45.467Z,
  ctime: 2020-02-20T14:44:45.467Z,
  birthtime: 2020-03-23T10:57:10.299Z
}
BigIntStats {
  dev: 3229478529n,
  mode: 33206n,
  nlink: 1n,
  uid: 0n,
  gid: 0n,
  rdev: 0n,
  blksize: 4096n,
  ino: 281474976780786n,
  size: 0n,
  blocks: 0n,
  atimeMs: 1584961030299n,
  mtimeMs: 1582209885466n,
  ctimeMs: 1582209885466n,
  birthtimeMs: 1584961030299n,
  atimeNs: 1584961030299117000n,
  mtimeNs: 1582209885466684900n,
  ctimeNs: 1582209885466684900n,
  birthtimeNs: 1584961030299117000n,
  atime: 2020-03-23T10:57:10.299Z,
  mtime: 2020-02-20T14:44:45.466Z,
  ctime: 2020-02-20T14:44:45.466Z,
  birthtime: 2020-03-23T10:57:10.299Z
}

参考:T2】https://nodejs.org/api/fs.html#fs_fs_fstatsync_fd_options

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