Question

你好假设我有以下json数组:(继承人数组中的前3个）

var data = [
                {
                    "percent_change_1h": "2.19",
                    "percent_change_24h": "-1.07",
                    "percent_change_7d": "-7.2",
                },
                {
                    "percent_change_1h": "1.96",
                    "percent_change_24h": "-2.13",
                    "percent_change_7d": "-11.64",
                },
                {
                    "percent_change_1h": "9.21",
                    "percent_change_24h": "18.31",
                    "percent_change_7d": "18.3",
                }
            ]

如何遍历此数据，并为每个数据集添加一个对象，以便在执行循环后，它将如下所示：

var data = [
                {
                    "percent_change_1h": "2.19",
                    "percent_change_24h": "-1.07",
                    "percent_change_7d": "-7.2",
                    "new_key": "newvalue"
                },
                {
                    "percent_change_1h": "1.96",
                    "percent_change_24h": "-2.13",
                    "percent_change_7d": "-11.64",
                    "new_key": "newvalue"
                },
                {
                    "percent_change_1h": "9.21",
                    "percent_change_24h": "18.31",
                    "percent_change_7d": "18.3",
                    "new_key": "newvalue"
                }
            ]

我使用for key in data循环以及forEach函数搞砸了，我无法理解它。任何帮助，将不胜感激。谢谢！

Answer 1

一个简单的循环就行了。尝试方便的for..of语法：

for (const o of data) o.new_key = "newvalue";

Answer 2

使用map()：

data = data.map(d => ({...d, new_value: "newvalue"}));

＆＃13;

var data = [
  {"percent_change_1h": "2.19",},
  {"percent_change_1h": "1.96",}
];

data = data.map(d => ({...d, new_value: "newvalue"}));

console.log(data);

＆＃13;

Answer 3

尝试循环trow对象然后添加newval，请参阅此函数：

var data = [
                {
                    "percent_change_1h": "2.19",
                    "percent_change_24h": "-1.07",
                    "percent_change_7d": "-7.2",
                },
                {
                    "percent_change_1h": "1.96",
                    "percent_change_24h": "-2.13",
                    "percent_change_7d": "-11.64",
                },
                {
                    "percent_change_1h": "9.21",
                    "percent_change_24h": "18.31",
                    "percent_change_7d": "18.3",
                }
            ]

function addValue(data,vals)
{
  for(var inc = 0;inc < data.length ; inc++)
  {
    data[inc]['newval'] = vals;
   }
   return data;
}

console.log(addValue(data,'newval'));

.as-console-wrapper {
    bottom: auto;
    max-height: 100%;
    top: 0;
}

循环遍历json数组并使用javascript添加到每个对象

3 个答案: