Question

我有一个JSON变量。

{
  "name": "test name",
  "place": "test place",
  "participants": {
    "one": {
      "lat_long": "0.0,0.0",
      "name": "name 1"
    },
    "two": {
      "lat_long": "0.0,0.0",
      "name": "name 2"
    }
  },
  "lat_long": "0.0,0.0"
}

如何使用javascript

将以下数据添加到上述变量的particpants键中

"theree": {
  "lat_long": "0.0,0.0",
  "name": "name 3"
}

这样我的新JSON变量就像这样

{
  "name": "test name",
  "place": "test place",
  "participants": {
    "one": {
      "lat_long": "0.0,0.0",
      "name": "name 1"
    },
    "two": {
      "lat_long": "0.0,0.0",
      "name": "name"
    },
    "theree": {
      "lat_long": "0.0,0.0",
      "name": "name 3"
    }
  },
  "lat_long": "0.0,0.0"
}

如何识别JSON对象和JSON数组？

Answer 1

由于您没有显示实际的合法javascript，只是数据片段，因此还不完全清楚您要问的是什么。所以，我已经提出了3个关于你可能要问的猜测：

如果您的初始数据名称为data，请执行以下操作：

var data = {
  "name": "test name",
  "place": "test place",
  "participants": {
    "one": {
      "lat_long": "0.0,0.0",
      "name": "name 1"
    },
    "two": {
      "lat_long": "0.0,0.0",
      "name": "name 2"
    }
  },
  "lat_long": "0.0,0.0"
};

然后，您可以添加theree属性，如下所示：

data.participants.theree = {
    "lat_long":"0.0,0.0",
    "name": "name 3"
};

如果您的键值在变量中（我们称之为名为key的变量），那么您使用[key]语法：

var key = "theree";
data.participants[key] = {
    "lat_long":"0.0,0.0",
    "name": "name 3"
};

如果您真正开始的是这样的对象：

var addData = {
    theree: {
        "lat_long":"0.0,0.0",
        "name": "name 3"
    }
}

你不知道theree的值，你需要从该对象获取它，然后由于你需要枚举addData对象的属性并添加每个一个到participants对象：

// add all items from the addData object to the participants object
// this is essentially a merge of addData into participants
for (var prop in addData) {
    if (addData.hasOwnProperty(prop) {
        data.participants[prop] = addData[prop];
    }
}

请注意，尽管您在问题中使用了array和push这两个术语，但此处没有数组，因此您不使用.push()方法。您只需向对象添加属性，可以通过直接分配添加到新属性名称。

另外，请注意JSON是一种专为数据交换而设计的文本格式。你在这里有一个javascript对象，它与JSON不同。

Answer 2

试试这个：

   var newdata = {"three": {
       "lat_long": "0.0,0.0",
       "name": "name 3"
       }
    };

   var newKey = Object.keys(newdata);
   data.participants[newKey[0]] = newdata[newKey[0]];

   console.log(data);

您的数据可能是：

 1.  var newdata = {"five": {
       "lat_long": "0.0,0.0",
       "name": "name 3"
       }
    };

 2.  var newdata = {"four": {
       "lat_long": "0.0,0.0",
       "name": "name 3"
       }
    };

它不依赖于密钥。

json Array PUSH

2 个答案: