使用Object.keys从JavaScript中JSON文件中的值中获取的多维数组

Question

基于问题https://pt.stackoverflow.com/questions/323738/como-incluir-arquivo-json-dentro-de-um-js(葡萄牙语(，但他没有数组，我有数组。我应用了它，但由于缺少他没有的数组，变量是未定义的。

您可以使用进行测试以运行预览。

我还试着应用这些问题：

1. 获取json对象的大小

2. JSON对象的多维数组

   • 首先在HTML文件中：

<p id="name">Name 1</p>
<p id="age">Age 1</p>
<p id="name">Name 2</p>
<p id="age">Age 2</p>
<p id="name">Name 3</p>
<p id="age">Age 3</p>
<p id="name">Name 4</p>
<p id="age">Age 4</p>
<p id="name">Name 5</p>
<p id="age">Age 5</p>

• JSON：

{
"people": 
[
{
"id": 0,
"name": "Person Name 0",
"age": 15
},
{
"id": 1,
"name": "Person Name 1",
"age": 25
},
{
"id": 2,
"name": "Person Name 2",
"age": 35
},
{
"id": 3,
"name": "Person Name 3",
"age": 45
},
{
"id": 4,
"name": "Person Name 4",
"age": 55
},
{
"id": 5,
"name": "Person Name 5",
"age": 60
}
]
}

• 基于葡萄牙语中的这个问题：

function readTextFile(file, callback) {
var rawFile = new XMLHttpRequest();
rawFile.overrideMimeType("application/json");
rawFile.open("GET", file, true);
rawFile.onreadystatechange = function() {
if (rawFile.readyState === 4 && rawFile.status == "200") {
callback(rawFile.responseText);
}
}
rawFile.send(null);
}
readTextFile("../json/people.json", function(text)
{
var people = JSON.parse(text);
var name = document.getElementById('name');
name.innerHTML = people.name;
var age = document.getElementById('age');
age.innerHTML = people.age;
console.log(people);

});

• 或使用Object.keys，如：

readTextFile("../json/people.json", function(text){
var people = JSON.parse(text);
var name = document.getElementById('name');
name.innerHTML = Object.keys(people.name).length;
var age = document.getElementById('age');
age.innerHTML = Object.keys(people.age).length;
console.log(people);

});

function readTextFile(file, callback) {
var rawFile = new XMLHttpRequest();
rawFile.overrideMimeType("application/json");
rawFile.open("GET", file, true);
rawFile.onreadystatechange = function() {
if (rawFile.readyState === 4 && rawFile.status == "200") {
callback(rawFile.responseText);
}
}
rawFile.send(null);
}
readTextFile("https://pastebin.com/raw/CzxURs8y", function(text)
{
var people = JSON.parse(text);
var name = document.getElementById('name');
name.innerHTML = people.name;
var age = document.getElementById('age');
age.innerHTML = people.age;
console.log(people);
});

<p id="name">Name 1</p>
<p id="age">Age 1</p>
<p id="name">Name 2</p>
<p id="age">Age 2</p>
<p id="name">Name 3</p>
<p id="age">Age 3</p>
<p id="name">Name 4</p>
<p id="age">Age 4</p>
<p id="name">Name 5</p>
<p id="age">Age 5</p>

Answer 1

fetch("../json/people.json")
.then(r=>r.json())
.then(json=>{
const nameElms = Array.from(document.querySelectorAll("[id='name']"));
const ageElms = Array.from(document.querySelectorAll("[id='age']"));
nameElms.forEach((n,i)=>{
const person = json.people[i];
n.textContent = person.name;
})
ageElms.forEach((n,i)=>{
const person = json.people[i];
n.textContent = person.age;
})
})