怎样获取到这段中的 top:661px 字段

style="position: absolute; top: 661px; left: 1290px; transform-origin: center bottom; z-index: 2080;"

这句代码我现在想要获取到top: 661px这段，用typeof检测该句为object,但是转字符串，转数组，split()都试过了拿不到，各位帮忙看看

  let el= document.getElementsByClassName('elPopoverClass')[0]；
   console.log('el:>> ', el.style.top);

let top = document.getElementsByClassName('elPopoverClass')[0].attributes.style
console.log(top)
// style="position: absolute; top: 661px; left: 1290px; transform-origin: center bottom; z-index: 2080;"