code: function Scrollable (data, nodeType) {
      this.loadmoreoffset = DEFAULT_LOAD_MORE_OFFSET
      this.isAvailableToFireloadmore = true
      const attrs = data.attr || {}
      const direction = attrs.scrollDirection
        || attrs.direction
        || DEFAULT_DIRECTION
      this.direction = directionMap.h.indexOf(direction) === -1
        ? 'v'
        : 'h'
      this.showScrollbar = attrs.showScrollbar || true
      Component.call(this, data, nodeType)
    }
docs: attrs: - loadmoreoffset: updatable - scroll-direciton: none|vertical|horizontal (default is vertical) - show-scrollbar: true|false (default is true)