objek json

[
    dictprovinceVOList[{
    areaId: 13257
    cityAreaList:[
    {
        areaCode: "1853"
        areaId: 13265
        areaList: 
        firstLetter:"S"
        langType:"zh_CN"
        latitude:22.124049
        longitude:
        113.559954
        parentId:13257
        pinYin:"shengfangjigetangqu"
        postCode:"820008"
        sortValue:8
        title:"圣方济各堂区"
    },
    {
        ...
    }]
    parentId: 0
    sortValue: 34
    title:"澳门特别行政区"
   },{
    areaId:13238
    cityAreaList:[
    {
        areaCode: "1853"
        areaId: 13265
        areaList: 
        firstLetter:"S"
        langType:"zh_CN"
        latitude:22.124049
        longitude:
        113.559954
        parentId:13257
        pinYin:"shengfangjigetangqu"
        postCode:"820008"
        sortValue:8
        title:"圣方济各堂区"
    },{
        ...
    }]
    parentId:0
    sortValue:33
    title:"香港特别行政区"
   }]


]

Dapatkan keputusan berikut. . Pengumpulan adalah berdasarkan medan cityAreaList: firstLetter

{
   "iniData":"S",
   "cityAreaList":[
        {
          "areaCode":"1853","areaId": 372, ...
        }，
        {...}
    ]
}