递归遍历

  reducePageDataTree = (result: any) => {
    return result.map((item: any) => {
      if(item.children.length)
      {
        item.children = this.reducePageDataTree(item.children) // 把子元素的遍历结果传递给item.children中
      }
      return {...item, key: item.id} // 把修改后的item返回
    })
  };