javascript - 在javascript中动态创建嵌套数组

Question

我需要在 JavaScript 中动态创建一个嵌套数组。数组需要具有这种结构。

{
  "name": "main",
  "children": [
    {
      "name": "main_topic_1",
      "children": [
        {
          "name": "sub_topic",
          "size": 422
        },
        {
          "name": "sub_topic",
          "size": 422
        }
      ]
    },
    {
      "name": "main_topic_2",
      "children": [
        {
          "name": "sub_topic",
          "size": 422
        },
        {
          "name": "sub_topic",
          "size": 422
        }
      ]
    },
    {
      "name": "main_topic_3",
      "children": [
        {
          "name": "sub_topic",
          "size": 422
        },
        {
          "name": "sub_topic",
          "size": 422
        }
      ]
    }
  ]
}

我需要能够动态选择“main_topic_x”的数量以及属于这些相应 main_topics 的 sub_topics 数量。

我正在尝试这样的事情，但我不知道如何获得上面的结构。

main_topics = ['topic 1','topic 2','topic 3'];
    sub_topics = ['subtopic 1','subtopic 2'];

    var a = new Array();
    var b = new Array();

    for(l=0; l<main_topics.length; l++){
      a[l] = b;
      for(j=0; j<sub_topics.length; j++){
        b[l] = sub_topics[j];
      }
    }
  
    console.log(JSON.stringify(a, null, 2));

Answer 1

这是我为您整理的内容:

var JSON_Object = {name:"main", children:[]};
var main_topics = ["main_topic_1", "main_topic_2", "main_topic_3","main_topic_4"];
var sub_topics = [  {parent_topic:0, name:"sub_topic_1", size:422},
                    {parent_topic:0, name:"sub_topic_2", size:422},
                    {parent_topic:0, name:"sub_topic_3", size:212},
                    {parent_topic:1, name:"sub_topic_4", size:322},
                    {parent_topic:1, name:"sub_topic_5", size:422},
                    {parent_topic:2, name:"sub_topic_6", size:322},
                    {parent_topic:2, name:"sub_topic_7", size:125},
                    {parent_topic:3, name:"sub_topic_8", size:422}];
for (let i in main_topics) {
  let tempObj = {name:main_topics[i], children:[]};
  for (let j in sub_topics) {
    if (sub_topics[j].parent_topic==i) {
      tempObj.children.push({name:sub_topics[j].name,size:sub_topics[j].size});
    }
  }
  JSON_Object.children.push(tempObj);
}
console.log(JSON.stringify(JSON_Object, null, 2));