一旦您解码了JSON，结果就是一个JavaScript对象。就像操纵其他物体一样操纵它。举例来说：

data.busNum = 12345;
...

var temp = data.oldKey; // or data['oldKey']
data.newKey = temp;
delete data.oldKey;

如果你的密钥保存在一个变量中。data.key = value不工作。
使用data[key] = value
范例：

data = {key1:'v1', key2:'v2'};

var mykey = 'key1'; 
data.mykey = 'newv1';
data[mykey] = 'newV2';

console.log(data);

测试结果：

{
  "key1": "newV2",
  "key2": "v2",
  "mykey": "newv1"
}

就像你对其他变量一样，你只需要设置它

alert(data.ID);
data.ID = "bar";  //dot notation 
alert(data.ID);    
data.userID = 123456;
data["address"] = "123 some street"; //bracket notation

data.userID = "10";

var y_axis_name=[];

 for(var point in jsonData[0].data)
              { 
                y_axis_name.push(point);

              }

y_axis_name包含所有键名
试穿jsfiddle

你只需要像一个普通的JavaScript变量Ex一样设置数据值：

data["userID"] = 4; // or data.userID = 4

//We loop inside the array with "for"
for(let i = 0; i < _arrayJsonItems.length; i++)
{
    //First, we write the keys we want to delete
    delete _arrayJsonItems[i].KeyOne;
    delete _arrayJsonItems[i].KeyTwo;

    //Finally, we add new values ​​with the same key names.
    _arrayJsonItems[i].KeyOne = "NewValue";
    _arrayJsonItems[i].KeyTwo = "NewValue";
    
}