是否向现有对象数组插入新的键值？

Question

我的对象看起来像这样：

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我想将包含数组的键值作为值添加到对象中，以实现如下所示：

{avg: 16, day: "2020-12-11", max: 25, min: 8,value:"o3"}
{avg: 18, day: "2020-12-12", max: 21, min: 15,value:"o3"}
{avg: 10, day: "2020-12-13", max: 16, min: 6,value:"o3"}
{avg: 16, day: "2020-12-11", max: 19, min: 12, value: "pm10"}
{avg: 11, day: "2020-12-12", max: 17, min: 6, value: "pm10"}
{avg: 20, day: "2020-12-13", max: 26, min: 10, poluant: "pm10"}

我尝试遍历每个对象，并像这样将值添加到结尾处，但我想知道是否可以在不遍历每个对象的情况下做到这一点(最后我有五个for循环)：

for (let item of this.o3) {
    item.value = 'o3';
}
    
for (let item of this.pm10) {
    item.value = 'pm10';
}  

Answer 1

Jou可以通过在循环中使用循环来做到这一点

var daily = {
o3 : [{avg: 16, day: "2020-12-11", max: 25, min: 8},
{avg: 18, day: "2020-12-12", max: 21, min: 15},
{avg: 10, day: "2020-12-13", max: 16, min: 6},
{avg: 16, day: "2020-12-11", max: 19, min: 12},
{avg: 11, day: "2020-12-12", max: 17, min: 6},
{avg: 20, day: "2020-12-13", max: 26, min: 10}
],
pm10 : [{avg: 16, day: "2020-12-11", max: 25, min: 8},
{avg: 18, day: "2020-12-12", max: 21, min: 15},
{avg: 10, day: "2020-12-13", max: 16, min: 6},
{avg: 16, day: "2020-12-11", max: 19, min: 12},
{avg: 11, day: "2020-12-12", max: 17, min: 6},
{avg: 20, day: "2020-12-13", max: 26, min: 10 }
]} ;


for(item in daily){
  
  
 if(item == "o3"){
   daily[item] = daily[item].map(x=> x = { ...x, value:"o3"} )
 }else if("pm10"){
   daily[item] = daily[item].map(x=> x = { ...x, value:"pm10"} )
}
  
}

console.log(daily)

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