通过API响应json数据的javascript循环

Question

我正在学习javascript，试图将一些代码合并到Node函数块中。在下面的代码中，var data是来自API的json有效负载。

var data = {
            "201201/tempUoTwoBalco": 
                {"value": 63.1199951171875, "route": "/vui/platforms/benshome/devices/201201/tempUoTwoBalco", "writable": false}, 
            "201201/tempUoThreeBalco": 
                {"value": 74.12999725341797, "route": "/vui/platforms/benshome/devices/201201/tempUoThreeBalco", "writable": false}, 
            "201201/Oat": 
                {"value": 89.99999237060547, "route": "/vui/platforms/benshome/devices/201201/Oat", "writable": false}, 
            "201201/RmTmpSpt": 
                {"value": 79.99999237060547, "route": "/vui/platforms/benshome/devices/201201/RmTmpSpt", "writable": true}, 
            "201201/RmTmp": 
                {"value": NaN, "route": "/vui/platforms/benshome/devices/201201/RmTmp", "writable": false}, 
            "201201/UhCmd": 
                {"value": 0, "route": "/vui/platforms/benshome/devices/201201/UhCmd", "writable": false}, 
            "201201/GlblHtgDsbl": 
                {"value": 0, "route": "/vui/platforms/benshome/devices/201201/GlblHtgDsbl", "writable": false}
};

console.log(data)


var supplyTemp = {};
var returnTemp = {};

sensor1 = "/vui/platforms/benshome/devices/201201/tempUoTwoBalco"
sensor2 = "/vui/platforms/benshome/devices/201201/tempUoThreeBalco"



for(var key in data){
    for(var key1 in data[key]){
        if(key1 === sensor1){
            console.log("sensor1 found "+ data[key][key1])
            // append float to supplyTemp?
        };

        if(key1 === sensor2){
            console.log("sensor2 found "+ data[key][key1])
            // append float to returnTemp?
        };
    };
};

如果在json有效负载中找到了for(var key in data){，那么如何将for循环keys合并到返回supplyTemp和returnTemp的函数中呢？有点像return [[supplyTemp,returnTemp]];

谢谢你的智慧，这是我想要得到的.

Answer 1

您需要将匹配的value属性sensor1和sensor2分别存储在supplyTemp和returnTemp中吗？您可以使用filter筛选与提供的传感器匹配的值，然后将结果映射到获取值。下面是一个例子：

​

var data = {
  "201201/tempUoTwoBalco":
    { "value": 63.1199951171875, "route": "/vui/platforms/benshome/devices/201201/tempUoTwoBalco", "writable": false },
  "201201/tempUoThreeBalco":
    { "value": 74.12999725341797, "route": "/vui/platforms/benshome/devices/201201/tempUoThreeBalco", "writable": false },
  "201201/Oat":
    { "value": 89.99999237060547, "route": "/vui/platforms/benshome/devices/201201/Oat", "writable": false },
  "201201/RmTmpSpt":
    { "value": 79.99999237060547, "route": "/vui/platforms/benshome/devices/201201/RmTmpSpt", "writable": true },
  "201201/RmTmp":
    { "value": NaN, "route": "/vui/platforms/benshome/devices/201201/RmTmp", "writable": false },
  "201201/UhCmd":
    { "value": 0, "route": "/vui/platforms/benshome/devices/201201/UhCmd", "writable": false },
  "201201/GlblHtgDsbl":
    { "value": 0, "route": "/vui/platforms/benshome/devices/201201/GlblHtgDsbl", "writable": false }
};

var supplyTemp = {};
var returnTemp = {};

let sensor1 = "/vui/platforms/benshome/devices/201201/tempUoTwoBalco"
let sensor2 = "/vui/platforms/benshome/devices/201201/tempUoThreeBalco"

supplyTemp = (Object.values(data).filter(element => element.route == sensor1).map(result => result.value))
returnTemp = (Object.values(data).filter(element => element.route == sensor2).map(result => result.value))

console.log([supplyTemp, returnTemp])

​

Answer 2

创建一个返回所找到对象的值的方法。我的代码与@deepak非常相似，只不过是D.R.Y (不要重复)。

我选择.find()而不是.filter()，因为您的代码表明传感器是唯一的。

• Find；返回匹配项或null。
• 筛选器将返回匹配项数组或空数组。

你应该选择你喜欢的哪一个。

let data = {
            "201201/tempUoTwoBalco": 
                {"value": 63.1199951171875, "route": "/vui/platforms/benshome/devices/201201/tempUoTwoBalco", "writable": false}, 
            "201201/tempUoThreeBalco": 
                {"value": 74.12999725341797, "route": "/vui/platforms/benshome/devices/201201/tempUoThreeBalco", "writable": false}, 
            "201201/Oat": 
                {"value": 89.99999237060547, "route": "/vui/platforms/benshome/devices/201201/Oat", "writable": false}, 
            "201201/RmTmpSpt": 
                {"value": 79.99999237060547, "route": "/vui/platforms/benshome/devices/201201/RmTmpSpt", "writable": true}, 
            "201201/RmTmp": 
                {"value": NaN, "route": "/vui/platforms/benshome/devices/201201/RmTmp", "writable": false}, 
            "201201/UhCmd": 
                {"value": 0, "route": "/vui/platforms/benshome/devices/201201/UhCmd", "writable": false}, 
            "201201/GlblHtgDsbl": 
                {"value": 0, "route": "/vui/platforms/benshome/devices/201201/GlblHtgDsbl", "writable": false}
};


let supplyTemp = {};
let returnTemp = {};

let sensor1 = "/vui/platforms/benshome/devices/201201/tempUoTwoBalco";
let sensor2 = "/vui/platforms/benshome/devices/201201/tempUoThreeBalco";

console.log(getTemp(sensor1, data));
// returns 63.1199951171875

console.log(getTemp(sensor1, data));
// returns 63.1199951171875

console.log(getTemp('', data));
// returns null

/**
* Get the sensor value for the given sensorRoute in the given array.
*/
function getTemp(sensorRoute, arr) { 
    let foundItem = Object.values(arr).find(element => element.route == sensorRoute);

  return foundItem ? foundItem.value : null;
}