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let isExits = fs.existsSync('hello.txt');
console.log(isExits) //true

• fs.exists(path, callback)
  • 已经删除的方法，因为验证功能一般需要立即获取到结果，无需引入异步
• fs.existesSync(path)

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fs.stat('hello.txt', function (err,stats) {
  console.log(stats);
})

运行结果

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Stats {
  dev: 3932212942,
  mode: 33206,
  nlink: 1,
  uid: 0,
  gid: 0,
  rdev: 0,
  blksize: 4096,
  ino: 5910974511137847,
  size: 46,
  blocks: 0,
  atimeMs: 1679821361534.1057,
  mtimeMs: 1679821361534.1057,
  ctimeMs: 1679821361534.1057,
  birthtimeMs: 1679818224344.4,
  atime: 2023-03-26T09:02:41.534Z,
  mtime: 2023-03-26T09:02:41.534Z,
  ctime: 2023-03-26T09:02:41.534Z,
  birthtime: 2023-03-26T08:10:24.344Z
}

• fs.stat(path, callback)
  • 获取文件的状态
  • 返回一个对象，该对象保存了当前对象状态的相关信息
• fs.statSync(path)

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fs.unlinkSync('./hello_copy_stream.txt');

• fs.unlink(path, callback)

• fs.unlinkSync(path)

将文件截断为指定大小

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fs.truncateSync('hello_copy.txt', 4);

• fs.truncate(path, len,callback)

• fs.truncateSync(path, len)

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fs.watchFile('hello.txt', function () {
  console.log('hello.txt change')
})

• fs.watchFile(filename[, options], listener)
  • options
    • interval 间隔，默认5000ms
  • listener参数
    • curr stat对象，表示当前文件的状态
    • prev stat对象，表示修改前文件的状态

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fs.readdir('.', function (err, data) {
  console.log(data);
})

运行结果

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[
  'asynch_write.js',
  'hello.txt',      
  'hello_copy.txt', 
  'main.js',        
  'other_func.js',  
  'read.js',        
  'simple_write.js',
  'stream_read.js', 
  'stream_write.js' 
]

• fs.readdir(path[, options], callback)
  • callback
    • err
    • files 数组 元素为目录中文件名
• fs.readdirSync(path[, options])

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fs.mkdirSync('hello');

• fs.mkdir(path[, mode], callback)
• fs.mkdirSync(path[, mode])

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fs.rmdirSync('hello');

• fs.rmdir(path, callback)
• fs.rmdirSync(path)

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fs.renameSync('hello_copy.txt','hello2.txt')

rename还能通过绝对路径实现文件的剪切功能

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fs.renameSync('hello_copy.txt','D:\\hello2.txt')

• fs.rename(oldPath, newPath, callback)
• fs.renameSync(oldPath, newPath)