从嵌套的集合模型javascript创建JSON [英] Create JSON from nested set model javascript

问题描述

我有这个数据结构，显示嵌套树中每个节点的深度：

I have this data structure that show the depth of each node in the nested tree:

[
  {
    "name": "ELECTRONICS",
    "depth": 0
  },
  {
    "name": "TELEVISIONS",
    "depth": 1
  },
  {
    "name": "TUBE",
    "depth": 2
  },
  {
    "name": "PLASMA",
    "depth": 2
  },
  {
    "name": "GAME CONSOLES",
    "depth": 1
  },
  {
    "name": "MP3 PLAYERS",
    "depth": 1
  },
  {
    "name": "FLASH",
    "depth": 2
  }]

我想将使用JavaScript / node.js / Angular的预览数据转换为这样的分层JSON：

I would like to transform the previews data with JavaScript / node.js / Angular into a hierarchical JSON like this:

[{
    "name": "ELECTRONICS",
    "children": [
      {
        "name": "TELEVISIONS",
        "children": [
          {
            "name": "TUBE"
          },
          {
            "name": "PLASMA"
          }]
     }, 
     {
        "name": "GAME CONSOLES"
     }, 
     {
        "name": "MP3 PLAYERS",
        "children": [
          {
            "name": "FLASH"
         }]
    }]
}]

推荐答案

你可以使用 数组#forEach 和一个用于深度参考的数组。

You could use Array#forEach and an array for the reference to the depth.

var data = [{ "name": "ELECTRONICS", "depth": 0 }, { "name": "TELEVISIONS", "depth": 1 }, { "name": "TUBE", "depth": 2 }, { "name": "PLASMA", "depth": 2 }, { "name": "GAME CONSOLES", "depth": 1 }, { "name": "MP3 PLAYERS", "depth": 1 }, { "name": "FLASH", "depth": 2 }],
    tree = [];

data.forEach(function (a, i, aa) {
    var lastDepth = (aa[i - 1] || {}).depth, o;
    if (a.depth !== 0 && a.depth > lastDepth) {
        o = this[lastDepth][this[lastDepth].length - 1]
        o.children = o.children || [];
        this[a.depth] = o.children;
    }
    this[a.depth].push({ name: a.name });
}, [tree]);

console.log(tree);

这篇关于从嵌套的集合模型javascript创建JSON的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！