Question

export function getTreeData(data, pid, pidName = 'parentId', idName = 'id', childrenName = 'children', key) {
  let arr = [];

  for (let i = 0; i < data.length; i++) {
    if (data[i][pidName] == pid) {
      data[i].key = data[i][idName];
      data[i][childrenName] = getTreeData(data, data[i][idName], pidName, idName, childrenName);
      arr.push(data[i]);
    }
  }

  return arr;
}