使用imacros获取由CSS实现的图像的大小

Question

我使用了一个imacro来获取width，height，naturalWidth和naturalHeight的图像。这个微妙的角色就像一个护身符：

SET !ERRORIGNORE YES
TAB T=1
SET !DATASOURCE urls.csv 
SET !DATASOURCE_COLUMNS 1
SET !LOOP 1
SET !DATASOURCE_LINE {{!LOOP}}
URL GOTO={{!COL1}}
WAIT SECONDS=4
URL GOTO=javascript:(function(){let<SP>di<SP>=<SP>window.document.images;let<SP>csv<SP>=<SP>"";for(let<SP>i=0,l=di.length,img=di[i];i<l;++i,img=di[i]){let<SP>w=img.width,h=img.height,nw=img.naturalWidth,nh=img.naturalHeight;csv<SP>+=<SP>window.location.href+","+img.src+","+w+","+h+","+nw+","+nh+"\r\n";};window.document.body.innerHTML<SP>=<SP>"<textarea<SP>id=csv<SP>rows=10<SP>cols=150<SP>wrap=off>"+csv+"</textarea>"})();
TAG POS=1 TYPE=TEXTAREA ATTR=ID:csv EXTRACT=TXT
SAVEAS TYPE=EXTRACT FOLDER=* FILE=image-data.csv

但是，此微动只能从实现为<img>的图像中获取数据。我现在想从由CSS实现的图像中获取数据，例如background-image。

使用以下JavaScript，我成功地将width和height的此类图像导入控制台：

function getBgImgs (doc) {
  const srcChecker = /url\(\s*?['"]?\s*?(\S+?)\s*?["']?\s*?\)/i
  return Array.from(
    Array.from(doc.querySelectorAll('*'))
      .reduce((collection, node) => {
        let prop = window.getComputedStyle(node, null)
          .getPropertyValue('background-image')
        // match `url(...)`
        let match = srcChecker.exec(prop)
        if (match) {
          collection.add(match[1])
        }
        return collection
      }, new Set())
  )
}

getBgImgs(document)

function loadImg (src, timeout = 500) {
  var imgPromise = new Promise((resolve, reject) => {
    let img = new Image()
    img.onload = () => {
      resolve({
        src: src,
        width: img.naturalWidth,
        height: img.naturalHeight
      })
    }
    img.onerror = reject
    img.src = src
  })
  var timer = new Promise((resolve, reject) => {
    setTimeout(reject, timeout)
  })
  return Promise.race([imgPromise, timer])
}

function loadImgAll (imgList, timeout = 500) {
  return new Promise((resolve, reject) => {
    Promise.all(
      imgList
        .map(src => loadImg(src, timeout))
        .map(p => p.catch(e => false))
    ).then(results => resolve(results.filter(r => r)))
  })
}

loadImgAll(getBgImgs(document)).then(imgs => console.log(imgs))

但是我无法在imacros中实现此javascript。此javascript应该如何在imacros中工作以从CSS图像中获取图像大小？