``` js
const data = [
{
province: '上海市',
city: '上海市市辖区',
adcode: '310118',
district: '青浦区',
},
{ province: '江苏', city: '苏州市', adcode: '320506', district: '吴中区' },
{ province: '山西省', city: '阳泉市', adcode: '140302', district: '城区' },
{
province: '上海市',
city: '上海市市辖区',
adcode: '310101',
district: '黄浦区',
},
{
province: '河北省',
city: '石家庄市',
adcode: '130123',
district: '正定县',
},
];

const pObj = {};
const cObj = {};
data.forEach(item => {
const { province, city } = item;
if (pObj[province]) {
pObj[province].push(item);
} else {
pObj[province] = [item];
}
if (cObj[city]) {
cObj[city].push(item);
} else {
cObj[city] = [item];
}
});
const proValue = Object.values(pObj);
const cityKey = Object.keys(cObj);
const res = [];
proValue.forEach(pro => {
cityKey.forEach(key => {
if (pro[0] && key === pro[0].city) {
res.push({
value: pro[0].adcode,
label: pro[0].province,
children: [
{
label: key,
value: pro[0].adcode,
children: cObj[key].map(dis => {
return {
label: dis.district,
value: pro[0].adcode,
};
}),
},
],
});
}
});
});
console.log(JSON.stringify(res));
```

写的不是很好，但是应该可以满足你的需求