起因
最近开发的项目中涉及到调用web_api并在前台解析的功能需求，web_api返回的数据只有极小部分有用，所以在解析后还需进行数据清洗，之后再调用其他组件再处理。
web_api返回的数据如下:
{ ???"Node": { ???????"name": "北京小桔科技有限公司", ???????"KeyNo": "4659626b1e5e43f1bcad8c268753216e", ???????"Category": 1, ???????"ShortName": "北京小桔", ???????"Count": 28, ???????"Level": 0, ???????"Children": [ ???????????{ ???????????????"name": "股东", ???????????????"KeyNo": null, ???????????????"Category": 3, ???????????????"ShortName": "股东", ???????????????"Count": 5, ???????????????"Level": 0, ???????????????"Children": [ ???????????????????{ ???????????????????????"name": "王刚", ???????????????????????"KeyNo": "4659626b1e5e43f1bcad8c268753216e_王刚", ???????????????????????"Category": 3, ???????????????????????"ShortName": "自然人股东", ???????????????????????"Count": 0, ???????????????????????"Level": 1, ???????????????????????"Children": null ???????????????????}, ???????????????????{ ???????????????????????"name": "张博", ???????????????????????"KeyNo": "4659626b1e5e43f1bcad8c268753216e_张博", ???????????????????????"Category": 3, ???????????????????????"ShortName": "自然人股东", ???????????????????????"Count": 0, ???????????????????????"Level": 1, ???????????????????????"Children": null ???????????????????} ???????????????] ???????????}, ???????????{ ???????????????"name": "对外投资", ???????????????"KeyNo": null, ???????????????"Category": 2, ???????????????"ShortName": "对外投资", ???????????????"Count": 23, ???????????????"Level": 0, ???????????????"Children": [ ???????????????????{ ???????????????????????"name": "北京车胜科技有限公司", ???????????????????????"KeyNo": "afb3daf1797df272997f22b143c964f6", ???????????????????????"Category": 2, ???????????????????????"ShortName": "北京车胜", ???????????????????????"Count": 0, ???????????????????????"Level": 1, ???????????????????????"Children": null ???????????????????}, ???????????????????{ ???????????????????????"name": "北京再造科技有限公司", ???????????????????????"KeyNo": "274d9311979595d54821e1d9e8d73e36", ???????????????????????"Category": 2, ???????????????????????"ShortName": "北京再造", ???????????????????????"Count": 0, ???????????????????????"Level": 1, ???????????????????????"Children": null ???????????????????} ???????????????] ???????????} ???????] ???}}后期需要调用组件需求的数据结构如下:
{ ???"name": "北京小桔科技有限公司", ???"children": [ ???????{ ???????????"name": "股东", ???????????"children": [ ???????????????{ ???????????????????"name": "王刚", ???????????????????"value": "自然人股东" ???????????????}, ???????????????{ ???????????????????"name": "张博", ???????????????????"value": "自然人股东" ???????????????} ???????????] ???????}, ???????{ ???????????"name": "对外投资", ???????????"children": [ ???????????????{ ???????????????????"name": "北京车胜", ???????????????????"value": "北京车胜科技有限公司" ???????????????}, ???????????????{ ???????????????????"name": "北京再造", ???????????????????"value": "北京再造科技有限公司" ???????????????} ???????????] ???????} ???]}以上展示的数据仅有两层，但在实际应用中，数据层级可能达到4层，由于是初次做前端JSON解析，网络上相关资料也很稀少，所以刚开始写起来还是很费劲的，但经过两小时摸索后，成功写出了解析方法，所以简单记录以下，希望对大家有所帮助。
解析方法
首先，JSON的最外层节点可以确定只有两个，即股东与投资人，所以这部分可以直接固定写好，像是这样：
???var json = {}; ???json.name = name; ???json.children = [];//children作为数组需要提前声明，否则会抛出undefined，下同 ???json.children[0] = {}; ???json.children[0].name = "股东"; ???json.children[0].children = []; ???json.children[1] = {}; ???json.children[1].name = "对外投资"; ???json.children[1].children = [];之后开始遍历第一层子节点
for (var i = 0; i < gudong.length; i++) { ???????//level1 ???????json.children[0].children[i] = {}; ???????json.children[0].children[i].name = gudong[i].name; ???????json.children[0].children[i].value = gudong[i].ShortName;此时准备便利第二层子节点，但在遍历二层子节点时需要注意判断二层子节点是否存在
if (gudong[i].Children != null) { ???????????json.children[0].children[i].children = []; //注意事先声明children类型，下同 ???????????for (var ii = 0; ii < gudong[i].Children.length; ii++) { ???????????????//level2 ???????????????json.children[0].children[i].children[ii] = {}; ???????????????json.children[0].children[i].children[ii].name = gudong[i].Children[ii].name; ???????????????json.children[0].children[i].children[ii].value = gudong[i].Children[ii].ShortName;之后用同样的方法便利第3、4层
if (gudong[i].Children[ii].Children != null) { ???????????????????json.children[0].children[i].children[ii].children = []; ???????????????????for (var iii = 0; iii < gudong[i].Children[ii].Children.length; iii++) { ???????????????????????//level3 ???????????????????????json.children[0].children[i].children[ii].children[iii] = {}; ???????????????????????json.children[0].children[i].children[ii].children[iii].name = gudong[i].Children[ii].Children[iii].name; ???????????????????????json.children[0].children[i].children[ii].children[iii].value = gudong[i].Children[ii].Children[iii].ShortName; ???????????????????????if (gudong[i].Children[ii].Children[iii].Children != null) { ???????????????????????????json.children[0].children[i].children[ii].children[iii].children = []; ???????????????????????????for (var iiii = 0; iiii < gudong[i].Children[ii].Children[iii].Children.length; iiii++) { ???????????????????????????????//level4 ???????????????????????????????json.children[0].children[i].children[ii].children[iii].children[iiii] = {}; ???????????????????????????????json.children[0].children[i].children[ii].children[iii].children[iiii].name = gudong[i].Children[ii].Children[iii].Children[iiii].name; ???????????????????????????????json.children[0].children[i].children[ii].children[iii].children[iiii].value = gudong[i].Children[ii].Children[iii].Children[iiii].ShortName; ???????????????????????????} ???????????????????????} ???????????????????} ???????????????}JS做JSON解析与数据清洗很繁复，尤其涉及到这种多层复杂数据时更为明显，但只要足够谨慎和耐心，还是可以很顺利写出令人满意的方法的，以上就是我的解决方法，其实在第一层没有必要固定写，在实际使用中已经做出了修正，在这里就不再贴出。
最后贴出完整的方法:
function buildJSON(gudong, duiwaitouzi, name) { ???var json = {}; ???json.name = name; ???json.children = []; ???json.children[0] = {}; ???json.children[0].name = "股东"; ???json.children[0].children = []; ???json.children[1] = {}; ???json.children[1].name = "对外投资"; ???json.children[1].children = []; ???for (var i = 0; i < gudong.length; i++) { ???????//level1 ???????json.children[0].children[i] = {}; ???????json.children[0].children[i].name = gudong[i].name; ???????json.children[0].children[i].value = gudong[i].ShortName; ???????if (gudong[i].Children != null) { ???????????json.children[0].children[i].children = []; ???????????for (var ii = 0; ii < gudong[i].Children.length; ii++) { ???????????????//level2 ???????????????json.children[0].children[i].children[ii] = {}; ???????????????json.children[0].children[i].children[ii].name = gudong[i].Children[ii].name; ???????????????json.children[0].children[i].children[ii].value = gudong[i].Children[ii].ShortName; ???????????????if (gudong[i].Children[ii].Children != null) { ???????????????????json.children[0].children[i].children[ii].children = []; ???????????????????for (var iii = 0; iii < gudong[i].Children[ii].Children.length; iii++) { ???????????????????????//level3 ???????????????????????json.children[0].children[i].children[ii].children[iii] = {}; ???????????????????????json.children[0].children[i].children[ii].children[iii].name = gudong[i].Children[ii].Children[iii].name; ???????????????????????json.children[0].children[i].children[ii].children[iii].value = gudong[i].Children[ii].Children[iii].ShortName; ???????????????????????if (gudong[i].Children[ii].Children[iii].Children != null) { ???????????????????????????json.children[0].children[i].children[ii].children[iii].children = []; ???????????????????????????for (var iiii = 0; iiii < gudong[i].Children[ii].Children[iii].Children.length; iiii++) { ???????????????????????????????//level4 ???????????????????????????????json.children[0].children[i].children[ii].children[iii].children[iiii] = {}; ???????????????????????????????json.children[0].children[i].children[ii].children[iii].children[iiii].name = gudong[i].Children[ii].Children[iii].Children[iiii].name; ???????????????????????????????json.children[0].children[i].children[ii].children[iii].children[iiii].value = gudong[i].Children[ii].Children[iii].Children[iiii].ShortName; ???????????????????????????} ???????????????????????} ???????????????????} ???????????????} ???????????} ???????} ???} ???for (var j = 0; j < duiwaitouzi.length; j++) { ???????//level1 ???????json.children[1].children[j] = {}; ???????json.children[1].children[j].name = duiwaitouzi[j].name; ???????json.children[1].children[j].value = duiwaitouzi[j].ShortName; ???????if (duiwaitouzi[j].Children != null) { ???????????json.children[1].children[j].children = []; ???????????for (var jj = 0; jj < duiwaitouzi[j].Children.length; jj++) { ???????????????//level2 ???????????????json.children[1].children[j].children[jj] = {}; ???????????????json.children[1].children[j].children[jj].name = duiwaitouzi[j].Children[jj].name; ???????????????json.children[1].children[j].children[jj].value = duiwaitouzi[j].Children[jj].ShortName; ???????????????if (duiwaitouzi[j].Children[jj].Children != null) { ???????????????????json.children[1].children[j].children[jj].children = []; ???????????????????for (var jjj = 0; jjj < duiwaitouzi[j].Children[jj].Children.length; jjj++) { ???????????????????????//level3 ???????????????????????json.children[1].children[j].children[jj].children[jjj] = {}; ???????????????????????json.children[1].children[j].children[jj].children[jjj].name = duiwaitouzi[j].Children[jj].Children[jjj].name; ???????????????????????json.children[1].children[j].children[jj].children[jjj].value = duiwaitouzi[j].Children[jj].Children[jjj].ShortName; ???????????????????????if (duiwaitouzi[j].Children[jj].Children[jjj] != null) { ???????????????????????????json.children[1].children[j].children[jj].children[jjj].children = []; ???????????????????????????for (var jjjj = 0; jjjj < duiwaitouzi[j].Children[jj].Children[jjj].length; jjjj++) { ???????????????????????????????//level4 ???????????????????????????????json.children[1].children[j].children[jj].children[jjj].children[jjjj] = {}; ???????????????????????????????json.children[1].children[j].children[jj].children[jjj].children[jjjj].name = duiwaitouzi[j].Children[jj].Children[jjj].Children[jjjj].name; ???????????????????????????????json.children[1].children[j].children[jj].children[jjj].children[jjjj].value = duiwaitouzi[j].Children[jj].Children[jjj].Children[jjjj].ShortName; ???????????????????????????} ???????????????????????} ???????????????????} ???????????????} ???????????} ???????} ???} ???console.log(json);}最后，是改进版本，这次写到了深度6：
function formatJSON(data) { ???data = data.Node; ???////level0 ???var json = {}; ???json.name = data.name; ???json.value = data.ShortName; ???if (data.Children != null) { ???????json.children = []; ???????for (var i = 0; i < data.Children.length; i++) { ???????????//level1 ???????????json.children[i] = {}; ???????????json.children[i].name = data.Children[i].name; ???????????json.children[i].value = data.Children[i].ShortName; ???????????if (data.Children[i].Children != null) { ???????????????json.children[i].children = []; ???????????????for (var ii = 0; ii < data.Children[i].Children.length; ii++) { ???????????????????//level2 ???????????????????json.children[i].children[ii] = {}; ???????????????????json.children[i].children[ii].name = data.Children[i].Children[ii].name; ???????????????????json.children[i].children[ii].value = data.Children[i].Children[ii].ShortName; ???????????????????if (data.Children[i].Children[ii].Children != null) { ???????????????????????json.children[i].children[ii].children = []; ???????????????????????for (var iii = 0; iii < data.Children[i].Children[ii].Children.length; iii++) { ???????????????????????????//level3 ???????????????????????????json.children[i].children[ii].children[iii] = {}; ???????????????????????????json.children[i].children[ii].children[iii].name = data.Children[i].Children[ii].Children[iii].name; ???????????????????????????json.children[i].children[ii].children[iii].value = data.Children[i].Children[ii].Children[iii].ShortName; ???????????????????????????if (data.Children[i].Children[ii].Children[iii].Children != null) { ???????????????????????????????json.children[i].children[ii].children[iii].children = []; ???????????????????????????????for (var iiii = 0; iiii < data.Children[i].Children[ii].Children[iii].Children.length; iiii++) { ???????????????????????????????????//level4 ???????????????????????????????????json.children[i].children[ii].children[iii].children[iiii] = {}; ???????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].name = data.Children[i].Children[ii].Children[iii].Children[iiii].name; ???????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].value = data.Children[i].Children[ii].Children[iii].Children[iiii].ShortName; ???????????????????????????????????if (data.Children[i].Children[ii].Children[iii].Children[iiii].Children != null) { ???????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children = []; ???????????????????????????????????????for (var iiiii = 0; iiiii < data.Children[i].Children[ii].Children[iii].Children[iiii].Children.length; iiiii++) { ???????????????????????????????????????????//level5 ???????????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children[iiiii] = {}; ???????????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children[iiiii].name = data.Children[i].Children[ii].Children[iii].Children[iiii].Children[iiiii].name; ???????????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children[iiiii].value = data.Children[i].Children[ii].Children[iii].Children[iiii].Children[iiiii].ShortName; ???????????????????????????????????????????if (data.Children[i].Children[ii].Children[iii].Children[iiii].Children[iiiii].Children != null) { ???????????????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children[iiiii].children = []; ???????????????????????????????????????????????for (var iiiiii = 0; iiiiii < data.Children[i].Children[ii].Children[iii].Children[iiii].Children[iiiii].Children.length; iiiiii++) { ???????????????????????????????????????????????????//level6 ???????????????????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children[iiiii].children[iiiiii] = {}; ???????????????????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children[iiiii].children[iiiiii].name = data.Children[i].Children[ii].Children[iii].Children[iiii].Children[iiiii].Children[iiiiii].name; ???????????????????????????????????????????????????json.children[i].children[ii].children[iii].children[iiii].children[iiiii].children[iiiiii].value = data.Children[i].Children[ii].Children[iii].Children[iiii].Children[iiiii].Children[iiiiii].ShortName; ???????????????????????????????????????????????} ???????????????????????????????????????????} ???????????????????????????????????????} ???????????????????????????????????} ???????????????????????????????} ???????????????????????????} ???????????????????????} ???????????????????} ???????????????} ???????????} ???????} ???} ???console.log("format: " + JSON.stringify(json));}JS下多层级JSON数据格式化
原文地址：https://www.cnblogs.com/cacricornus/p/9044889.html