Node.js文件系统fs扩展fs-extra说明

npm i fs-extra

const fse = require('fs-extra')

copy(src:string, dest:string, [options:object, callback:function])

// 复制文件
fse.copy('old.txt', 'new.txt', err => {
  if (err) throw err
  console.log('success')
})
// 复制目录，目录可以包含内容
fse.copy('utils', 'newutils', err => {
  if (err) throw err
  console.log('success')
})
// promise 
fse.copy('utils', 'newutils')
.then(() => {
    console.log('success')
})
.catch(err => {
    console.log(err)
})
// async/await
async function test () {
    try {
        await fse.copy('utils', 'newutils')
        console.log('success')
    } catch (err) {
        console.log(err)
    }
}
test()

emptyDir(dir:string, [callback:function])

fse.emptyDir('newutils', err => {
  if (err) throw err
  console.log('success')
})

ensureFile(file:string, [callback:func])

fse.ensureFile('newutils/seq.js', err => {
  if (err) throw err
  console.log('success')
})

ensureDir(dir:string, [callback:func])

fse.ensureDir('newutil', err => {
  if (err) throw err
  console.log('success')
})

move(src:string, dest:string, [options:object, callback:func])

fse.move('newutils/seq.js', 'newutil/seq.js', err => {
  if (err) throw err
  console.log('success')
})

outputFile(file:string, data:string|Buffer|Uint8Array, [options:String|object, callback:func])

fse.outputFile('newutil/seq.js', 'hello, Node.js', err => {
  if (err) throw err
  console.log('success')
})

outputJson(file:string, object:object, [options:object, callback:func])

fse.outputJson('newutil/seq.json', { name: 'duli' }, err => {
  if (err) throw err
  console.log('success')
})

writeJson(file, object, [options, callback])

fse.writeJSON('newutil/seq.json', { name: 'cc' }, err => {
  if (err) throw err
  console.log('success')
})

pathExists(file:string, [, callback:func])

fse.pathExists('newutil/seq.js', (err, exists) => {
  if (err) throw err
  console.log(exists)
})

readJson(file:string, [options:object, callback:func])

fse.readJson('newutil/seq.json', (err, obj) => {
  if (err) throw err
  console.log(obj)
  console.log(typeof obj)
})

remove(path:String, [callback:func])

fse.remove('new.txt', err => {
  if (err) throw err
  console.log('success')
})