javascript - nodejs中JSON数据类型的转换方法

Question

我有一个 NodeJS Express 代码，它只是以请求-响应格式将数据从客户端传递到我的后端服务器。现在我的客户期望 JSON 响应中的美元金额为 double 据类型。我如何动态地做到这一点。例如下面，

var data =   [
{
   "feeType":"Trip",
   "feeCategory":"Transaction",
   "feeAmount":0,
   "isApplicable":true,
   "isRequired":true,
   "applicableDeliveryType":"None",
   "appliedFeeAmount":0
},
{
   "feeType":"FerryFee",
   "feeCategory":"Passenger",
   "feeAmount":2,
   "isApplicable":true,
   "isRequired":false,
   "applicableDeliveryType":"None",
   "appliedFeeAmount":2
},
{
   "feeType":"WillCall",
   "feeCategory":"Service",
   "feeAmount":0,
   "isApplicable":false,
   "isRequired":false,
   "applicableDeliveryType":"Pickup",
   "appliedFeeAmount":0
},
{
   "feeType":"NotTravelling",
   "feeCategory":"Service",
   "feeAmount":0,
   "isApplicable":false,
   "isRequired":false,
   "applicableDeliveryType":"PrintAtHome",
   "appliedFeeAmount":0
},
{
   "feeType":"Pickup",
   "feeCategory":"Delivery",
   "feeAmount":0,
   "isApplicable":false,
   "isRequired":false,
   "applicableDeliveryType":"None",
   "appliedFeeAmount":0
},
{
   "feeType":"PrintAtHome",
   "feeCategory":"Delivery",
   "feeAmount":0,
   "isApplicable":false,
   "isRequired":false,
   "applicableDeliveryType":"None",
   "appliedFeeAmount":0
}

]

我的客户期望使用 .0 或十进制数字作为数值。我该怎么做？

Answer 1

使用 Object.entries 遍历对象并使用 .toFixed() 添加小数点:

const data = [{
    "feeType": "Trip",
    "feeCategory": "Transaction",
    "feeAmount": 0,
    "isApplicable": true,
    "isRequired": true,
    "applicableDeliveryType": "None",
    "appliedFeeAmount": 0
  },
  {
    "feeType": "FerryFee",
    "feeCategory": "Passenger",
    "feeAmount": 2,
    "isApplicable": true,
    "isRequired": false,
    "applicableDeliveryType": "None",
    "appliedFeeAmount": 2
  }
]

const result = data.map(o => Object.entries(o).reduce((acc, [key, value]) => {
  acc[key] = typeof value.toFixed === 'function' ? value.toFixed(1) : value;
  return acc;
}, {}))
console.log(result);

或者 for .. in :

const data = [{
    "feeType": "Trip",
    "feeCategory": "Transaction",
    "feeAmount": 0,
    "isApplicable": true,
    "isRequired": true,
    "applicableDeliveryType": "None",
    "appliedFeeAmount": 0
  },
  {
    "feeType": "FerryFee",
    "feeCategory": "Passenger",
    "feeAmount": 2,
    "isApplicable": true,
    "isRequired": false,
    "applicableDeliveryType": "None",
    "appliedFeeAmount": 2
  }
]
const result = [];
data.forEach(o => {
  const tempObj = {};
  for (let key in o) {
    tempObj[key] = typeof o[key].toFixed === 'function' ? o[key].toFixed(1) : o[key];
  }
  result.push(tempObj);
});
console.log(result);