HTML代码：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">

    <title>Our superheroes</title>

    <link href="https://fonts.googleapis.com/css?family=Faster+One" rel="stylesheet">
    <link rel="stylesheet" href="style.css">
  </head>

  <body>

      <header>

      </header>

      <section>

      </section>

    <script>
    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();
    request.open('GET', requestURL);
    request.responseType = 'json';
    request.send();
    request.onload = function() {
    var superHeroes = request.response;
    populateHeader(superHeroes);
    showHeroes(superHeroes);
    }
    function populateHeader(jsonObj) {
  var myH1 = document.createElement('h1');
  myH1.textContent = jsonObj['squadName'];
  header.appendChild(myH1);

  var myPara = document.createElement('p');
  myPara.textContent = 'Hometown: ' + jsonObj['homeTown'] + ' // Formed: ' + jsonObj['formed'];
  header.appendChild(myPara);
  }
  function showHeroes(jsonObj) {
  var heroes = jsonObj['members'];

  for(i = 0; i < heroes.length; i++) {
    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:';

    var superPowers = heroes[i].powers;
    for(j = 0; j < superPowers.length; j++) {
      var listItem = document.createElement('li');
      listItem.textContent = superPowers[j];
      myList.appendChild(listItem);
    }

    myArticle.appendChild(myH2);
    myArticle.appendChild(myPara1);
    myArticle.appendChild(myPara2);
    myArticle.appendChild(myPara3);
    myArticle.appendChild(myList);

    section.appendChild(myArticle);
      }
    }
    request.responseType = 'json';
    request.open('GET', requestURL);
request.responseType = 'text'; // now we're getting a string!
request.send();

request.onload = function() {
  var superHeroesText = request.response; // get the string from the response
  var superHeroes = JSON.parse(superHeroesText); // convert it to an object
  populateHeader(superHeroes);
  showHeroes(superHeroes);
}
var myJSON = { "name": "Chris", "age": "38" };
myJSON
var myString = JSON.stringify(myJSON);
myString
    </script>
  </body>
</html>

CSS代码：

/* || 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: 0;
}

h2 {
  font-size: 2.5rem;
  letter-spacing: -5px;
  margin-bottom: 10px;
}

JSON的一个例子（代码来源于网上）

HTML代码：

CSS代码：

网页效果：

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