_lastNode () {
    let lastNode = null
    const dom = this.getDom()
    if (dom && dom.parentNode) {
      let lastDom = dom.parentNode.lastChild
      lastNode = Node.getNodeFromTarget(lastDom)
      while (lastDom && lastNode && !lastNode.isVisible()) {
        lastDom = lastDom.previousSibling
        lastNode = Node.getNodeFromTarget(lastDom)
      }
    }
    return lastNode
  }
Get the last rendered node
@return {Node | null} lastNode
@private