code: function (node) {
          return !node.firstChild || domUtils.getChildCount(node, function (node) {
              return  !domUtils.isBr(node) && !domUtils.isBookmarkNode(node) && !domUtils.isWhitespace(node)
          }) == 0
      }
docs: 判断给定节点是否为空节点
  @method isEmptyNode
  @param { Node } node 需要检测的节点对象
  @return { Boolean } 节点是否为空
  @example
  ```javascript
  UE.dom.domUtils.isEmptyNode( document.body );
  ```