无法在 JSON 对象中添加新的键值对请有人帮助我

Question

我正在尝试在下面的 JSON 对象中添加键值对，但是添加的方式不对，有什么办法可以为每个对象添加一个新的键值对，那个将帮助我完成要求。

JSON如下：

var object =[
      {
         "asdf":"",
         "fdrtf":"869966",
         "hdhfhfh":"utytut",
         "Cat":"A"
         
      },
      {
         "hjhj":"",
         "hfhfhf":"h",
         "hhfh":"hfjfhdj",
         "cat":"B"
         
      },
      {
         "hjhj":"",
         "hfhfhf":"h",
         "hhfh":"hfjfhdj",
         "cat":"B"
      }
]

code i am using to add the new key value pair :
for (let i = 0; i < object.length; i++) {
            object[i]['ABC'] = [i];
        }

实际预计应该是：

var object =[
      {
         "asdf":"",
         "fdrtf":"869966",
         "hdhfhfh":"utytut",
         "Cat":"A",
         "ABC": "0"
         
      },
      {
         "hjhj":"",
         "hfhfhf":"h",
         "hhfh":"hfjfhdj",
         "cat":"B",
         "ABC": "1"
         
      },
      {
         "hjhj":"",
         "hfhfhf":"h",
         "hhfh":"hfjfhdj",
         "cat":"B"
         "ABC": "2"
      }
]

我得到的最终值如下：

["0":{
         "hjhj":"",
         "hfhfhf":"h",
         "hhfh":"hfjfhdj",
         "cat":"B",
      
   },
   "1":{
         "asdf":"",
         "fdrtf":"869966",
         "hdhfhfh":"utytut",
         "Cat":"A"
         
   },
   "2":{
       "hjhj":"",
         "hfhfhf":"h",
         "hhfh":"hfjfhdj",
         "cat":"B"
   }
  ]

好心人帮我弄出期望值,真的很需要

Answer 1

您粘贴的代码看起来没问题。但是您正在将数组分配给 ABC 属性.

去掉数组，直接赋值。

for (let i = 0; i < object.length; i++) {
        object[i]['ABC'] = i
}

工作示例：

var object = [
    {
        "asdf": "",
        "fdrtf": "869966",
        "hdhfhfh": "utytut",
        "Cat": "A"

    },
    {
        "hjhj": "",
        "hfhfhf": "h",
        "hhfh": "hfjfhdj",
        "cat": "B"

    },
    {
        "hjhj": "",
        "hfhfhf": "h",
        "hhfh": "hfjfhdj",
        "cat": "B"
    }
]

for (let i = 0; i < object.length; i++) {
    object[i]['ABC'] = i
}

console.log(object);

//Use JSON.stringify if you need Json string
console.log(JSON.stringify(object));

使用 ES6 map 和扩展运算符

var object = [
    {
        "asdf": "",
        "fdrtf": "869966",
        "hdhfhfh": "utytut",
        "Cat": "A"

    },
    {
        "hjhj": "",
        "hfhfhf": "h",
        "hhfh": "hfjfhdj",
        "cat": "B"

    },
    {
        "hjhj": "",
        "hfhfhf": "h",
        "hhfh": "hfjfhdj",
        "cat": "B"
    }
]

let updatedObject = object.map( (item, index) => ({...item, 'ABC': index}));
console.log(updatedObject);

//Use JSON.stringify if you need Json string
console.log(JSON.stringify(updatedObject));

无法在 JSON 对象中添加新的键值对请有人帮助我

not able to add new key value pair in the JSON object kindly some one help me out

javascript

java

json

object

lwc

无法在 JSON 对象中添加新的键值对 请有人帮助我

not able to add new key value pair in the JSON object kindly some one help me out

javascript

java

json

object

lwc

无法在 JSON 对象中添加新的键值对请有人帮助我