function getNode (el, noCache) {
  if ( noCache === void 0 ) noCache = false;

  if (typeof el === 'string') {
    if (typeof window.Vue !== 'undefined') {
      return find(el)
    }
    el = noCache ? find(el) : (cacheNode[el] || (cacheNode[el] = find(el)));
  }

  return el
}
Get Node
@param  {String|Element} el
@param  {Boolean} noCache
@return {Element}