javascript - 使用 Node js迭代json数组对象

Question

我有一个任务要遍历包含 json 数组的复杂 json 文件。我无法从 json 文件访问数组对象。

I need to access the particularly the class-name object from the json file.

类细节.json

[ [ {   "student" : [ 
     {
     "name" : "AAaa",
     "class-name" : "A",
     "grade-label" : "AA"   }, 
     {
     "name" : "AAbb",
     "class-name" : "A",
     "grade-label" : "AB"   }, 
     {
     "name" : "AAcc",
     "class-name" : "A",
     "grade-label" : "AB"   }, 
     {
     "name" : "AAdd",
     "class-name" : "B",
     "grade-label" : "AA"   } ],  
      "Average" : 2.5 },

      {   
     "student" : [ 
      {
     "name" : "BBaa",
     "class-name" : "B",
     "grade-label" : "AB"   }, 
      {
     "name" : "BBbb",
     "class-name" : "B",
     "grade-label" : "AA"   }, 
      {
     "name" : "BBcc",
     "class-name" : "B",
     "grade-label" : "AA"   }, 
      {
     "name" : "BBdd",
     "class-name" : "B",
     "grade-label" : "AA"   } ],   
      "Average" : 2.5 } ] ]

迭代.js

var fs = require('fs');
var express = require('express');
var http = require('http');
var publicApis;
var item;
var subItem;


classmem = JSON.parse(fs.readFileSync("classdetail.json", "utf8"));



for (item in classmem) {
  for (subItem in classmem[item]) {
     console.log(classmem[item][subItem]);
  }
}

Answer 1

for (item in classmem) {
  for (subItem in classmem[item]) {
     var student = classmem[item][subItem].student;
     for (row in student) {
       console.log(student[row]['class-name']);
     }
  }
}

但请阅读 Array.forEach .