如何创建JSON对象Node js

Question

我试图在Node js中创建一个JSON对象,但没有任何成功.例如,创建一个像这样的对象:

{ 'Orientation Sensor': 
   [ { sampleTime: '1450632410296',
       data: '76.36731:3.4651554:0.5665419' },
     { sampleTime: '1450632410296',
       data: '78.15431:0.5247617:-0.20050584' } ],
  'Screen Orientation Sensor': 
   [ { sampleTime: '1450632410296',
       data: '255.0:-1.0:0.0' } ],
  'MPU6500 Gyroscope sensor UnCalibrated': 
   [ { sampleTime: '1450632410296',
       data: '-0.05006743:-0.013848438:-0.0063915867},
     { sampleTime: '1450632410296',
       data: '-0.051132694:-0.0127831735:-0.003325345'}]}

但是以一种动态的方式,不知道每个项目的大小.Node js有类似的东西吗？非常感谢你

Answer 1

我相信你正在寻找的是一种使用数组作为对象值的方法:

var o = {} // empty Object
var key = 'Orientation Sensor';
o[key] = []; // empty Array, which you can push() values into


var data = {
    sampleTime: '1450632410296',
    data: '76.36731:3.4651554:0.5665419'
};
var data2 = {
    sampleTime: '1450632410296',
    data: '78.15431:0.5247617:-0.20050584'
};
o[key].push(data);
o[key].push(data2);

这是标准的JavaScript,而不是NodeJS特有的.为了将其序列化为JSON字符串,您可以使用本机JSON.stringify:

JSON.stringify(o);
//> '{"Orientation Sensor":[{"sampleTime":"1450632410296","data":"76.36731:3.4651554:0.5665419"},{"sampleTime":"1450632410296","data":"78.15431:0.5247617:-0.20050584"}]}'

Answer 2

JavaScript Object()构造函数创建一个可以为其分配成员的Object.

myObj = new Object()
myObj.key = value;
myObj[key2] = value2;   // Alternative