我的解决方案

[Liboq]

const listToTree = (rootList, id = 0, list = []) => {
  for (const item in rootList) {
    if (rootList[item].pid === id) {
      list.push(rootList[item]);
      rootList.splice(item, 1);
    }
  }
  for (const i of list) {
    i.children = [];

    const children = rootList.filter((item) => {
      return item.pid === i.id;
    });
    children.forEach((item) => {
      item.children = [];
      const list1 = listToTree(rootList, item.id, list.children);
      item.children.push(...list1);
    });
    i.children.push(...children);
  }
  return list;
};