如何通过JavaScript查看本地文件夹中的文件数？

Question

need to get the number of images in folder from directory just by javascript.

I searched and tried several ways, but i didn't find any javascript solution.

Answer 1

Using frontend JS is not possible, but using NodeJS it is.

In case you want to achieve it using NodeJS, I wrote an example of reading and retrieving the count of 'png' files in a directory. This is how I achieved it:

1-Build a NodeJS project:

mkdir myProject
cd myProject
npm init -y

2-Write the example:

touch index.js

const fs = require('fs')
const dir = '.'
const fileExtension = 'png'

fs.readdir(dir, (err, files) => {
  let count = 0

  files.forEach(element => {
    if (getFileExtension(element) === fileExtension) {
      count++
    }
  })

  console.log(count)
})

/**
 * 
 * @param {String} fileName 
 * @source https://stackoverflow.com/a/12900504
 * @returns 
 */
const getFileExtension = fileName => {
  return fileName.slice((fileName.lastIndexOf(".") - 1 >>> 0) + 2)
}

3-Execute it:

node index.js

2 //  <- output