Method has

packages/shell/src/model/node-children.ts:118–120

* 是否包含指定节点 * @param node * @returns

(node: IPublicModelNode)

   * @returns
   */
  has(node: IPublicModelNode): boolean {
    return this[nodeChildrenSymbol].has((node as any)?.[nodeSymbol]);
  }

  /**
   * 类似数组的 forEach