getIllustUrl. it's useless, maybe

main.js

/** 
	* getIllustUrl - DevTools console script to get pixiv illust original image... in it's page
	* Written by GitHub@Dobby233Liu
	* Public Domain, take the below function is free too.
	* note: this script will output to console. output may be:
	* url and data (success), boolean and error message, including "GET xxx 4xx/5xx" (api error), or "uncaught error" (something gone wrong)
	* offical version always at: https://gist.github.com/Dobby233Liu/1e61dccc9f67156157bcf15387319566
**/
getIllustUrl = (illustID, cb, httpErrorCB) => {
  fetch("https://www.pixiv.net/ajax/illust/" + illustID)
  .then(async (r) => {
    return {
      err: !r.ok
      , j: await r.json()
      , stText: r['statusText'] || toString(r['status'])
    }
  })
  .then((j) => {
    if (!j.err && !j.j.error) {
      cb(j.j.body.urls.original, j.j.body)
    } else {
      httpErrorCB(j.err || j.j.error, (j.j.error ? j.j.message : j.stText))
    }
  })
}
getIllustUrl(location.pathname.replace(/\/artworks\//ig, "").replace(/\//g, ""), console.log, console.log)
/** 
	* anti 403 way: 
	* replace fore getIllustUrl(...) call code with below code: (no "*" character)
	* getIllustUrl(location.pathname.replace(/\/artworks\//ig, "").replace(/\//g, ""), (result,body)=>{var ele=document.createElement("img"),b=(ele.src=result),c=(document.body.appendChild(ele))}, console.log)
	* then you can dl the image at the most bottom of the page.
	* sorry for the confusing code.
**/