JavaScript遞歸樹，修改或添加屬性值

let index = 0;
        const mapTree = (org) => {
          const haveChildren = Array.isArray(org.children) && org.children.length > 0;
          index++;
          return {
            ...org,
            sortLabel: index,
            children: haveChildren ? org.children.map(child => mapTree(child)) : null,
          };
        };
        const list = listTree.map(org => mapTree(org));