bayfiles_getallcdn.js

const fetch = require('node-fetch')

const fullUrl = 'https://bayfiles.com/W6Z6ceh8bf/rengekawai_jpg'

async function getUrl() {
  const res = await fetch(fullUrl)

  const text = await res.text()
  const [, url] = /<a href="(https:\/\/cdn-\d{2}.+)">/.exec(text)
  return url
}

const delay = t => new Promise(r => setTimeout(r, t))
void async function() {
  const map = new Map()
  while(map.size < 10) {
    const url = await getUrl()
    const cdn = +url.substring(12, 14)

    map.set(cdn, url)
    console.log(map)

    await delay(5000)
  }
}()