javascript - 如何使用 Javascript 更改我的 json 对象的结构

Question

I have a json object which stores all the vehicle models with their brand. 

[{
"brand":"Audi","model":"A4"
},
{
"brand":"Audi","model":"A6"
},
{
"brand":"BMW","model":"Z4"
},
{
"brand":"Audi","model":"R8"
},
{
"brand":"Volvo","model":"v40"
},
{
"brand":"BMW","model":"5 Series"
}]

但问题是，如果我有 3 个奥迪车型，那么列表会一次又一次地重复品牌，从而用重复值填充我的列表。所以我需要制作一个像这样的 json 对象:我只想使用 javascript 或 angularjs 制作一个 json 对象，如下所示:

 [ {"brand":"Audi","models":["A4","A6","R8"]},
    {"brand":"BMW","models":["Z4","5 Series"]},
    {"brand":"Volvo","models":["v40"]}]

Answer 1

您可以使用 angular js 或 javascript 轻松制作 JSON。您可以在 angular js 中使用以下方法。在 javascript 中，只需使用相同类型的循环，如“for”。

var model = {};
var brandList = [];
var returnObject = [];

var data = [
  {
    "brand": "Audi", "model": "A4"
  },
  {
    "brand": "Audi", "model": "A6"
  },
  {
    "brand": "BMW", "model": "Z4"
  },
  {
    "brand": "Audi", "model": "R8"
  },
  {
    "brand": "Volvo", "model": "v40"
  },
  {
    "brand": "BMW", "model": "5 Series"
  }
]

angular.forEach(data, function (dat, index) {
  if (brandList.indexOf(dat.brand) == -1) {
    brandList.push(dat.brand);
    model[dat.brand] = [];
    model[dat.brand].push(dat.model);
  } else {
    model[dat.brand].push(dat.model);
  }
});

angular.forEach(brandList, function (val, index) {
  var obj = {};
  obj.brand = val;
  obj.models = model[val];
  returnObject.push(obj);
});

现在 returnObject 将包含您想要的 JSON 对象。