javascript将数组 转为树形结构

	const arr = []
	const result = {}
	arr.forEach((item) => {
			const { lxid, name, code } = item;
			if (!result[lxid]) {
				result[lxid] = [];
			}
			result[lxid].push({
				label: name,
				value: code
			});
		});