Question

我收到另一个代码的json响应，其格式如下：

[{"Latitude":"17.4283466666667","Longitude":"78.5797422222222", "VehicleNumber":"TS08UA6743"},
{"Latitude":"17.4282822222222","Longitude":"78.5799111111111","VehicleNumber":"TS08UA6743"},
{"Latitude":"17.4284233333333","Longitude":"78.5797333333333","VehicleNumber":"TS08UA6745"}]

我想动态更改它并保存在如下所示的数组中：

var coordinates = {

"TS08UA6743": [
[17.4283466666667,78.5797422222222],
[17.4282822222222,78.5799111111111]
],

"TS08UA6745": [
[17.4284233333333,78.5797333333333]
]

};

这似乎很简单，但我是javascript新手，无法处理数组，有人可以提供逻辑帮助吗？

Answer 1

您可以使用Reduce

let data = [{"Latitude":"17.4283466666667","Longitude":"78.5797422222222", "VehicleNumber":"TS08UA6743"},{"Latitude":"17.4282822222222","Longitude":"78.5799111111111","VehicleNumber":"TS08UA6743"},{"Latitude":"17.4284233333333","Longitude":"78.5797333333333","VehicleNumber":"TS08UA6745"}]

let op = data.reduce((out,{VehicleNumber:vn,Latitude:lat,Longitude:lon})=>{
  if(out[vn]){ out[vn].push([lat,lon]) }
  else { out[vn] = [[lat,lon]] }
  return out
},{})

console.log(op)

如果其他地方还可以用此简写代替，但我会保留原样，以免影响可读性。

((out[vn] ? out[vn].push([lat,lon]) : out[vn]=[[lat,lon]]), out)

Answer 2

您可以为此使用reduce()：

const input = [
  {
    "Latitude":"17.4283466666667",
    "Longitude":"78.5797422222222",
    "VehicleNumber":"TS08UA6743"
  },
  {
    "Latitude":"17.4282822222222",
    "Longitude":"78.5799111111111",
    "VehicleNumber":"TS08UA6743"
  },
  {
    "Latitude":"17.4284233333333",
    "Longitude":"78.5797333333333",
    "VehicleNumber":"TS08UA6745"
  }
];

let res = input.reduce((acc, {Latitude, Longitude, VehicleNumber}) =>
{
    acc[VehicleNumber] = acc[VehicleNumber] || [];
    acc[VehicleNumber].push([Latitude, Longitude]);
    return acc;
}, {});

console.log(res);

Answer 3

您可以使用.reduce()获得所需的输出：

const data = [{
    "Latitude": "17.4283466666667",
    "Longitude": "78.5797422222222",
    "VehicleNumber": "TS08UA6743"
}, {
    "Latitude": "17.4282822222222",
    "Longitude": "78.5799111111111",
    "VehicleNumber": "TS08UA6744"
},{
    "Latitude": "17.4284233333333",
    "Longitude": "78.5797333333333",
    "VehicleNumber": "TS08UA6745"
}];

const result = data.reduce(
  (r, {VehicleNumber:vn, Latitude:lt, Longitude:lg}) => (r[vn] = [lt, lg], r), {}
);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 4

检查输出是否具有车辆编号属性。如果包含，则更新该属性，否则添加新的vehiclenumber属性。

let input = [{"Latitude":"17.4283466666667","Longitude":"78.5797422222222", "VehicleNumber":"TS08UA6743"},
{"Latitude":"17.4282822222222","Longitude":"78.5799111111111","VehicleNumber":"TS08UA6743"},
{"Latitude":"17.4284233333333","Longitude":"78.5797333333333","VehicleNumber":"TS08UA6745"}];

let output = {};
input.map(x=>{
  if(output[x.VehicleNumber]){
     output[x.VehicleNumber] = [...output[x.VehicleNumber], [x.Latitude, x.Longitude]]
  }else{
   output[x.VehicleNumber] = [[x.Latitude, x.Longitude]]
  }
})

console.log(output);

处理数组或json响应并将其另存为JavaScript中的另一个数组

4 个答案: