JavaScript 日常任务脚本

自动文件备份

const fs = require('fs')
const path = require('path')

function backupFiles(sourceFolder, backupFolder) {
  fs.readdir(sourceFolder, (err, files) => {
    if (err) throw err
    files.forEach((file) => {
      const sourcePath = path.join(sourceFolder, file)
      const backupPath = path.join(backupFolder, file)
      fs.copyFile(sourcePath, backupPath, (err) => {
        if (err) throw err
        console.log(`Backed up ${file}`)
      })
    })
  })
}

const source = './path'
const backup = './backup'
backupFiles(source, backup)

发送预定电子邮件

const nodemailer = require('nodemailer')

function sendScheduledEmail(toEmail, subject, body, sendTime) {
  const delay = sendTime - Date.now()
  setTimeout(() => {
    let transporter = nodemailer.createTransport({
      service: 'gmail',
      auth: {
        user: 'your_email@gmail.com',
        pass: 'your_password' // Consider using environment variables for security
      }
    })
    let mailOptions = {
      from: 'your_email@gmail.com',
      to: toEmail,
      subject: subject,
      text: body
    }
    transporter.sendMail(mailOptions, function (error, info) {
      if (error) {
        console.log(error)
      } else {
        console.log('Email sent: ' + info.response)
      }
    })
  }, delay)
}
// Schedule email for 10 seconds from now
const futureTime = Date.now() + 10000
sendScheduledEmail('recipient@example.com', 'Hello!', 'This is a scheduled email.', futureTime)

监控目录的更改

const fs = require('fs')

function monitorFolder(pathToWatch) {
  fs.watch(pathToWatch, (eventType, filename) => {
    if (filename) {
      console.log(`${eventType} on file: ${filename}`)
    } else {
      console.log('filename not provided')
    }
  })
}
monitorFolder('./utils')

将图像转换为 PDF

const fs = require('fs')
const PDFDocument = require('pdfkit')

function imagesToPDF(imageFolder, outputPDF) {
  const doc = new PDFDocument()
  const writeStream = fs.createWriteStream(outputPDF)
  doc.pipe(writeStream)
  fs.readdir(imageFolder, (err, files) => {
    if (err) throw err
    files
      .filter((file) => /\.(jpg|jpeg|png)$/i.test(file))
      .forEach((file, index) => {
        const imagePath = `${imageFolder}/${file}`
        if (index !== 0) doc.addPage()
        doc.image(imagePath, {
          fit: [500, 700],
          align: 'center',
          valign: 'center'
        })
      })
    doc.end()
    writeStream.on('finish', () => {
      console.log(`PDF created: ${outputPDF}`)
    })
  })
}
imagesToPDF('./images', 'output.pdf')

桌面通知提醒

const notifier = require('node-notifier')

function desktopNotifier(title, message, notificationTime) {
  const delay = notificationTime - Date.now()
  setTimeout(() => {
    notifier.notify({
      title: title,
      message: message,
      sound: true // Only Notification Center or Windows Toasters
    })
    console.log('Notification sent!')
  }, delay)
}
// Notify after 15 seconds
const futureTime = Date.now() + 15000
desktopNotifier('Meeting Reminder', 'Team meeting at 3 PM.', futureTime)

自动清理旧文件

const fs = require('fs')
const path = require('path')

function cleanOldFiles(folder, days) {
  const now = Date.now()
  const cutoff = now - days * 24 * 60 * 60 * 1000
  fs.readdir(folder, (err, files) => {
    if (err) throw err
    files.forEach((file) => {
      const filePath = path.join(folder, file)
      fs.stat(filePath, (err, stat) => {
        if (err) throw err
        if (stat.mtime.getTime() < cutoff) {
          fs.unlink(filePath, (err) => {
            if (err) throw err
            console.log(`Deleted ${file}`)
          })
        }
      })
    })
  })
}
cleanOldFiles('/path/to/old/files', 30)

批量重命名文件

const fs = require('fs')
const path = require('path')

function batchRename(folder, prefix) {
  fs.readdir(folder, (err, files) => {
    if (err) throw err
    files.forEach((file, index) => {
      const ext = path.extname(file)
      const oldPath = path.join(folder, file)
      const newPath = path.join(folder, `${prefix}_${String(index).padStart(3, '0')}${ext}`)
      fs.rename(oldPath, newPath, (err) => {
        if (err) throw err
        console.log(`Renamed ${file} to ${path.basename(newPath)}`)
      })
    })
  })
}
batchRename('/path/to/files', 'image')

将多个 PDF 合并为一个

const fs = require('fs')
const PDFMerger = require('pdf-merger-js')

async function mergePDFs(pdfFolder, outputPDF) {
  const merger = new PDFMerger()
  const files = fs.readdirSync(pdfFolder).filter((file) => file.endsWith('.pdf'))
  for (const file of files) {
    await merger.add(path.join(pdfFolder, file))
  }
  await merger.save(outputPDF)
  console.log(`Merged PDFs into ${outputPDF}`)
}
mergePDFs('/path/to/pdfs', 'merged_document.pdf')