const convert = data => {
    const options = []
    const proviceMap = {}
    data.forEach(item => {
        // 没有省
        if (!proviceMap[item.province]) {
            proviceMap[item.province] = {
                index: options.length,
                citys: [item.city]
            }
            options.push({
                value: item.province,
                label: item.province,
                children: [
                    {
                        value: item.city,
                        label: item.city,
                        children: [
                            {
                                value: item.adcode,
                                label: item.district,
                            }
                        ]
                    }
                ]
            })
            return
        }
        const provinceIndex = proviceMap[item.province].index
        const cityIndex = proviceMap[item.province].citys.indexOf(item.city)
        //  没有市
        if (cityIndex === -1) {
            options[provinceIndex].children.push({
                value: item.city,
                label: item.city,
                children: [
                    {
                        value: item.adcode,
                        label: item.district,
                    }
                ]
            })
            return
        }
        // 有省有市
        options[provinceIndex].children[cityIndex].children.push({
            value: item.adcode,
            label: item.district,
        })
    })
}