Function computedStyle

src/utils/dom.js:80–88

(el, attr)

}

export function computedStyle (el, attr) {
  var lineHeight;
  if (el.currentStyle) {
    lineHeight = el.currentStyle[attr]
  } else if (window.getComputedStyle) {
    lineHeight = window.getComputedStyle(el , null)[attr];
  }
  return lineHeight;
}

export function getLineHeight (origin) {
  let el = origin.cloneNode(true);