在JSON中遍历数组

Question

I am generating a graph through JSON. I want to include every element of my Array in it. As you can see I am hard coding the array elements currently (relation[0], relation[1]). I want to iterate through the whole array. How ever, I obviously can't put for loop in JSON. If I try to include only array itself (relation), my graph wont generate because the whole array is wrapped with [ ] brackets. So instead of adding relation[0], relation[1], ..... I'd like that to be added automatically based on array size.

this.graph.fromJSON({
  "cells": [{
      "type": "qad.Question",
      "size": {"width": 201.8984375, "height": 125},
      "optionHeight": 30,
      "questionHeight": 45,
      "paddingBottom": 20,
      "minWidth": 150,
      "inPorts": [{"id": "in", "label": "In"}],
      "outPorts": [],
      "position": {"x": 300, "y": 38},
      "angle": 0,
      "question": objectName2,
      "options": objectCol2,
      "id": "1849d917-8a43-4d51-9e99-291799c144db",
      "z": 2
    }, relation[0],relation[1]
  ]
});

Answer 1

for (var i = 0; i < json.length; i++) {
  var obj = json[i];

  console.log(obj.id);
}

Answer 2

Taken from: How do I iterate over a JSON structure?

 var arr = [ {"id":"10", "class": "child-of-9"}, {"id":"11", "class": "child-of-10"}]; for (var i = 0; i < arr.length; i++){ document.write("<br><br>array index: " + i); var obj = arr[i]; for (var key in obj){ var value = obj[key]; document.write("<br> - " + key + ": " + value); } } 

Answer 3

var relation= [relation[0],relation[1]];
var obj = {
  "cells": [{
      "type": "qad.Question",
      "size": {"width": 201.8984375, "height": 125},
      "optionHeight": 30,
      "questionHeight": 45,
      "paddingBottom": 20,
      "minWidth": 150,
      "inPorts": [{"id": "in", "label": "In"}],
      "outPorts": [],
      "position": {"x": 300, "y": 38},
      "angle": 0,
      "question": objectName2,
      "options": objectCol2,
      "id": "1849d917-8a43-4d51-9e99-291799c144db",
      "z": 2
    }
  ]
};
this.graph.fromJSON(obj.cells.concat(relation));