Question

我有一个看起来像这样的Json文件

"timeline": [
{
"t0": [
    { "x": 0.000000, "y": 0.000000, "z": 0.000000 },
    { "x": -0.120473, "y": 4.998491, "z": 0.000000 },
    { "x": -0.323933, "y": 9.994292, "z": 0.000000 },
    { "x": -0.610325, "y": 14.986026, "z": 0.000000 },
    { "x": -0.979571, "y": 19.972315, "z": 0.000000 }, {....}

以此类推。

因此，存在一个对象“时间轴”，该对象由61个称为“ t0”，“ t1”，...“ t60”的对象组成，并且每个对象都是一个数组，其点由x-，y-和z坐标。

那么有人可以告诉我如何访问t0对象，甚至更好地访问其中的单独坐标吗？

json文件是否通常是这种方式？

最好的问候

亚历克斯

Answer 1

data = {"timeline": [{"t0": [{ "x": 0.000000, "y": 0.000000, "z": 0.000000 },{ "x": -0.120473, "y": 4.998491, "z": 0.000000 },{ "x": -0.323933, "y": 9.994292, "z": 0.000000 },{ "x": -0.610325, "y": 14.986026, "z": 0.000000 },{ "x": -0.979571, "y": 19.972315, "z": 0.000000 }]},{"t1": [{ "x": 0.000000, "y": 0.000000, "z": 0.000000 },{ "x": -0.120473, "y": 4.998491, "z": 0.000000 },{ "x": -0.323933, "y": 9.994292, "z": 0.000000 },{ "x": -0.610325, "y": 14.986026, "z": 0.000000 },{ "x": -0.979571, "y": 19.972315, "z": 0.000000}] }]}

变量数据包含示例json对象。

let cnt = 0;
for(let obj of data.timeline){
        var str= "t"+cnt;
        for(let p of obj[str]){
            console.log("x is :"+p.x);
            console.log("y is :"+p.y);
            console.log("z is :"+p.z);
        }
        cnt=cnt+1;
}

使用此方法，您可以从json数据中提取此类json对象的单独坐标。如果您使用不同类型的json数据，则代码将被更改。

Answer 2

在这里简单地编写您的逻辑

var data = {"timeline": [{"t0": [
{ "x": 0.000000, "y": 0.000000, "z": 0.000000 },
{ "x": -0.120473, "y": 4.998491, "z": 0.000000 },
{ "x": -0.323933, "y": 9.994292, "z": 0.000000 },
{ "x": -0.610325, "y": 14.986026, "z": 0.000000 },
{ "x": -0.979571, "y": 19.972315, "z": 0.000000 }
]}]}

console.log(data.timeline[0]["t0"]);

或者您可以尝试

$.each(data.timeline, function(key, val) {console.log(val)})

Answer 3

代码注释，显示每件事。无需单独的计数器。

let obj = {
  "timeline": [{
      "t0": [{
          "x": 0.000000,
          "y": 0.000000,
          "z": 0.000000
        },
        {
          "x": -0.120473,
          "y": 4.998491,
          "z": 0.000000
        },
        {
          "x": -0.323933,
          "y": 9.994292,
          "z": 0.000000
        },
        {
          "x": -0.610325,
          "y": 14.986026,
          "z": 0.000000
        }
      ]
    },
    {
      "t1": [{
          "x": 0.000000,
          "y": 0.000000,
          "z": 0.000000
        },
        {
          "x": -0.120473,
          "y": 4.998491,
          "z": 0.000000
        },
        {
          "x": -0.323933,
          "y": 9.994292,
          "z": 0.000000
        },
        {
          "x": -0.610325,
          "y": 14.986026,
          "z": 0.000000
        }
      ]
    },
    {
      "t2": [{
          "x": 0.000000,
          "y": 0.000000,
          "z": 0.000000
        },
        {
          "x": -0.120473,
          "y": 4.998491,
          "z": 0.000000
        },
        {
          "x": -0.323933,
          "y": 9.994292,
          "z": 0.000000
        },
        {
          "x": -0.610325,
          "y": 14.986026,
          "z": 0.000000
        }
      ]
    }
  ]
};
//two different ways to access
let onepoint = obj["timeline"][1]["t1"][2]["x"]
console.log(onepoint);
let onepointDirect = obj.timeline[1].t1[2].x
console.log(onepointDirect);

// timeline array process
for (let i = 0; i < obj.timeline.length; i++) {
  // objects inside each array
  for (let tobj in obj.timeline[i]) {
    console.log("tobj", tobj); //t0,t1 etc.
    // array of objects (the x,y,z things
    for (let t = 0; t < obj.timeline[i][tobj].length; t++) {
      console.log(tobj, t, obj.timeline[i][tobj][t]);
      // each x
      console.log("x:", obj.timeline[i][tobj][t].x);
    }
  }
}

访问json中的对象中的对象

3 个答案: