{
    "success": true,
    "code": 200,
    "message": "successful",
    "data": [{
        "id": "1",
        "city": "佛山市",
        "gdp":57,
    }, {
        "id": "2",
        "city": "珠海市",
        "gdp":46,
    },
    {
        "id": "3",
        "city": "广州市",
        "gdp":72,
    },
    {
        "id": "4",
        "city": "深圳市",
        "gdp":63,
    }
    ]
}