<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Our supersheet</title>
<link href="https://fonts.googleapis.com/css?family=Faster+One" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="style.css">
</head> <body>
<header > </header><!-- /header --> <section> </section>
<script src="script/main.js"> </script>
</body>
</html>
style.css
/* || general styles */
html {
font-family: 'helvetica neue', helvetica, arial, sans-serif;
}
body {
width: 800px;
margin: 0 auto;
}
h1, h2 {
font-family: 'Faster One', cursive;
}
/* header styles */
h1 {
font-size: 4rem;
text-align: center;
}
header p {
font-size: 1.3rem;
font-weight: bold;
text-align: center;
}
/* section styles */
section article {
width: 33%;
float: left;
}
section p {
margin: 5px 0;
}
section ul {
margin-top:;
}
h2 {
font-size: 2.5rem;
letter-spacing: -5px;
margin-bottom: 10px;
}
main.js
var header = document.querySelector('header');
var section = document.querySelector('section');
var requestURL = 'https://mdn.github.io/learning-area/javascript/oojs/json/superheroes.json';
var request = new XMLHttpRequest();//API,创建请求，只需要更新小部分而无需加载整个页面
request.open('GET', requestURL);//初始化请求，get--HTTP方法
request.responseType = 'text';//响应类型
request.send();//send方法，发送请求
request.onload = function() {//request，声明的对象；onload，自定义的方法
var superHeroesText = request.response;//response，属性
var superHeroes = JSON.parse(superHeroesText);
populateHeader(superHeroes);//自定义函数，调用
showHeroes(superHeroes);//superHeroes作用域在function，基于json的js对象
}
/**
* [populateHeader description]
* @param {[type]} jsonObj [description]
* @return {[type]} [description]
*/
function populateHeader(jsonObj) {//函数定义，形参
var myH1 = document.createElement('h1');//声明变量myH1,赋值h1元素
myH1.textContent = jsonObj['squadName'];//文本内容属性，赋值squadName对象的属性
header.appendChild(myH1);//header结点，增加一个myH1子节点，将其附加到标题appendChild()
var myPara = document.createElement('p');//
myPara.textContent = 'Hometown: ' + jsonObj['homeTown'] + ' // Formed: ' + jsonObj['formed'];//把对象home Town和formed属性的lianjiezifuc
header.appendChild(myPara);
}
/**
* [showHeroes description]
* @param {[type]} jsonObj [description]
* @return {[type]} [description]
*/
function showHeroes(jsonObj) {//创建并显示超级英雄卡
var heroes = jsonObj['members'];
for (var i = 0; i < heroes.length; i++) {//members数组对象；创建了几个新元素article、h2。。。。
var myArticle = document.createElement('article');
var myH2 = document.createElement('h2');
var myPara1 = document.createElement('p');
var myPara2 = document.createElement('p');
var myPara3 = document.createElement('p');
var myList = document.createElement('ul');
myH2.textContent = heroes[i].name;
myPara1.textContent = 'Secret identity: ' + heroes[i].secretIdentity;
myPara2.textContent = 'Age: ' + heroes[i].age;
myPara3.textContent = 'Superpowers:';//值为数组，又用一个循环处理
var superPowers = heroes[i].powers;//嵌套循环，
for (var j = 0; j < superPowers.length; j++) {
var listItem = document.createElement('li');
listItem.textContent = superPowers[j];
myList.appendChild(listItem);
}
myArticle.appendChild(myH2);//在myArticle中增加子节点，把获取的值显现在html中
myArticle.appendChild(myPara1);
myArticle.appendChild(myPara2);
myArticle.appendChild(myPara3);
myArticle.appendChild(myList);
section.appendChild(myArticle);//把myArticle的值放入section
}
}
json文件（https://mdn.github.io/learning-area/javascript/oojs/json/superheroes.json）
{
"squadName" : "Super hero squad",
"homeTown" : "Metro City",
"formed" : 2016,
"secretBase" : "Super tower",
"active" : true,
"members" : [
{
"name" : "Molecule Man",
"age" : 29,
"secretIdentity" : "Dan Jukes",
"powers" : [
"Radiation resistance",
"Turning tiny",
"Radiation blast"
]
},
{
"name" : "Madame Uppercut",
"age" : 39,
"secretIdentity" : "Jane Wilson",
"powers" : [
"Million tonne punch",
"Damage resistance",
"Superhuman reflexes"
]
},
{
"name" : "Eternal Flame",
"age" : 1000000,
"secretIdentity" : "Unknown",
"powers" : [
"Immortality",
"Heat Immunity",
"Inferno",
"Teleportation",
"Interdimensional travel"
]
}
]
}
结果如下：https://mdn.github.io/learning-area/javascript/oojs/json/heroes-finished-json-parse.html