Function extractAttrs

01.GettingStarted/js/vue.js:7728–7732

* Helper to extract a component container's attributes * into a plain object array. * * @param {Element} el * @return {Array}

(el)

   */

  function extractAttrs(el) {
    if (el.nodeType === 1 && el.hasAttributes()) {
      return toArray(el.attributes);
    }
  }

  /**
   * Merge the attributes of two elements, and make sure