Node.js fs.fstatSync() 方法

fs.fstatSync() 方法用于同步返回有关给定文件描述符的信息。 fs.Stat 对象返回几个字段和方法以获取有关文件的更多详细信息。

句法：

fstatSync( fd, options )

参数：此方法接受上面提到的两个参数，如下所述：

• fd：它是一个整数值，表示该方法使用的文件描述符。
• options：它是一个对象，可用于指定将影响输出的可选参数。它有一个可选参数：
  • bigint：它是一个布尔值，指定 fs.Stats 对象中返回的数值是否为 bigint。默认值为假。

下面的示例说明了 Node.js 中的fs.fstatSync() 方法：

示例 1：此示例使用 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：此示例使用 fs.fstatSync() 方法获取带有和不带有 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： https://nodejs.org/api/fs.html#fs_fs_fstatsync_fd_options