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const fs = require(‘fs‘);

// --------------- 讀取源文件 ---------------
const originData = require(‘./vuxArea3.json‘);

// --------------- 常量 ---------------
const constant = {
  ARRAY_TYPE: ‘Array‘,
  JSON_TYPE: ‘Json‘,
};

// --------------- 轉換的配置 ---------------

const config = {
  originKey: {
    children: 
 
null,
    parent: ‘parent‘,
    value: ‘value‘,
    label: ‘name‘
  },
  originType: constant.ARRAY_TYPE,
  targetKey: {
    children: ‘children‘,
    parent: null,
    value: ‘value‘,
    label: ‘label‘
  },
  targetType: constant.JSON_TYPE
};


// --------------- 轉換函數 ---------------
function convertArrayToJson(initData, { originKey, targetKey }) {
  
 
if (!initData || initData.length === 0) return [];
  if (!initData.length === 1) return initData;
  if (!(initData instanceof Array)) return [initData];

  const result = [];
  const tempMap = [];

  const key = originKey.value;
  const parentKey = originKey.parent;
  const l = initData.length;
  let i;

  
 
// key轉換
  const data = initData.map(item => ({
    [originKey.parent]: item[originKey.parent],
    [targetKey.value]: item[originKey.value],
    [targetKey.label]: item[originKey.label]
  }));

  // 臨時引用
  for (i = 0; i < l; i += 1) {
    tempMap[data[i][key]] = data[i];
  }

  // 葉子通過臨時引用掛載，利用所有的節點都是單例，才可以通過臨時引用去掛載葉子
  // 根元素直接push到根節點
  for (i = 0; i < l; i += 1) {
    const parentValue = data[i][parentKey];
    // 當前元素存在父元素，並且子不等於父
    if (tempMap[parentValue] && data[i][key] !== parentValue) {
      // 父元素上在children上加上當前元素
      tempMap[parentValue][targetKey.children] =
        tempMap[parentValue][targetKey.children] || [];
      tempMap[parentValue][targetKey.children].push(data[i]);
    } else {
      // 當前元素是根元素
      result.push(data[i]);
    }
  }
  return result;
}

function convert(data, { originKey, originType, targetKey, targetType }) {
  if (originType === constant.ARRAY_TYPE && targetType === constant.JSON_TYPE) {
    return convertArrayToJson(data, { originKey, targetKey });
  }
  return [];
}

// --------------- 執行 ---------------
const result = convert(originData, config);
let resultStr = ‘‘;
try {
  resultStr = JSON.stringify(result);
} catch (e) {
  console.log(e);
}
resultStr = resultStr.replace(/"parent":"[a-zA-Z\d]+",/g, ‘‘);

// --------------- 寫入 ---------------
fs.writeFile(‘./result.json‘, resultStr, ‘utf-8‘, (err) => {
  if (err) {
    console.log(err);
  } else {
    console.log(`### conver ${config.originType} to ${config.targetType} success! `);
  }
});

const fs = require(‘fs‘);
// --------------- 讀取源文件 --------------- const originData = require(‘./vuxArea3.json‘);
// --------------- 常量 --------------- const constant = { ARRAY_TYPE: ‘Array‘, JSON_TYPE: ‘Json‘, };
// --------------- 轉換的配置 ---------------
const config = { originKey: { children: null, parent: ‘parent‘, value: ‘value‘, label: ‘name‘ }, originType: constant.ARRAY_TYPE, targetKey: { children: ‘children‘, parent: null, value: ‘value‘, label: ‘label‘ }, targetType: constant.JSON_TYPE };

// --------------- 轉換函數 --------------- function convertArrayToJson(initData, { originKey, targetKey }) { if (!initData || initData.length === 0) return []; if (!initData.length === 1) return initData; if (!(initData instanceof Array)) return [initData];
const result = []; const tempMap = [];
const key = originKey.value; const parentKey = originKey.parent; const l = initData.length; let i;
// key轉換 const data = initData.map(item => ({ [originKey.parent]: item[originKey.parent], [targetKey.value]: item[originKey.value], [targetKey.label]: item[originKey.label] }));
// 臨時引用 for (i = 0; i < l; i += 1) { tempMap[data[i][key]] = data[i]; }
// 葉子通過臨時引用掛載，利用所有的節點都是單例，才可以通過臨時引用去掛載葉子 // 根元素直接push到根節點 for (i = 0; i < l; i += 1) { const parentValue = data[i][parentKey]; // 當前元素存在父元素，並且子不等於父 if (tempMap[parentValue] && data[i][key] !== parentValue) { // 父元素上在children上加上當前元素 tempMap[parentValue][targetKey.children] = tempMap[parentValue][targetKey.children] || []; tempMap[parentValue][targetKey.children].push(data[i]); } else { // 當前元素是根元素 result.push(data[i]); } } return result; }
function convert(data, { originKey, originType, targetKey, targetType }) { if (originType === constant.ARRAY_TYPE && targetType === constant.JSON_TYPE) { return convertArrayToJson(data, { originKey, targetKey }); } return []; }
// --------------- 執行 --------------- const result = convert(originData, config); let resultStr = ‘‘; try { resultStr = JSON.stringify(result); } catch (e) { console.log(e); } resultStr = resultStr.replace(/"parent":"[a-zA-Z\d]+",/g, ‘‘);
// --------------- 寫入 --------------- fs.writeFile(‘./result.json‘, resultStr, ‘utf-8‘, (err) => { if (err) { console.log(err); } else { console.log(`### conver ${config.originType} to ${config.targetType} success! `); } });

【筆記】nodejs讀取JSON，數組轉樹