JS Project：iterator

最新推荐文章于 2024-09-09 13:39:54 发布

原创最新推荐文章于 2024-09-09 13:39:54 发布 · 320 阅读

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本文介绍了一种使用迭代器函数遍历并展示数据集的方法，通过创建一个ProfileIterator来逐个访问包含用户信息的数据项，并将其显示在HTML页面上。每点击一次按钮，页面将更新显示下一个用户的详细资料。

iter遍历的data

const data = [
  {
    name:'Jone Doe',
    age:32,
    gender:'male',
    lookingfor:'female',
    location:'Boston MA',
    image:'https://randomuser.me/api/portraits/men/82.jpg'
  },
  {
    name:'Jone Doe2',
    age:32,
    gender:'male',
    lookingfor:'female',
    location:'Boston MA',
    image:'https://randomuser.me/api/portraits/women/82.jpg'
  },
{
    name:'Jone Doe3',
    age:32,
    gender:'male',
    lookingfor:'female',
    location:'Boston MA',
    image:'https://randomuser.me/api/portraits/women/80.jpg'
    },
];

iterator函数

每次返回profiles的下一个数据；


//Profile Iterator
function profileIterator(profiles){
  let nextIndex = 0;

  return {
    next: function(){
      return nextIndex<profiles.length?
      {value:profiles[nextIndex++],done:false}:
      {done:true};
    }
  };
}

将数据显示在html中

currentProfile 得到当前data；
在document中显示data；
若遍历完成——currentProfile返回null，刷新页面

function nextProfile(){
  const currentProfile=profiles.next().value;

  if(currentProfile!=null){
  document.getElementById('profileDisplay').innerHTML=`
  <ul class='list-group'>
    <li class='list-group-item'>Name : ${currentProfile.name}</li>
    <li class='list-group-item'>Age : ${currentProfile.age}</li>
    <li class='list-group-item'>Location : ${currentProfile.location}</li>
    <li class='list-group-item'>Preference : ${currentProfile.gender} looking for ${currentProfile.lookingfor}</li>
  </ul>
  `;
  document.getElementById('imageDisplay').innerHTML=`
  <img src="${currentProfile.image}">
  `
}else{
  //No more profiles
  window.location.reload();
}
}

页面加载时调用next

const profiles = profileIterator(data);
//Call first profile
nextProfile();

设定button调用next

//Next Event
document.getElementById('next').addEventListener('click',nextProfile);

index.html

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">

    <title>Profile Scroller</title>
  </head>
  <body>
    <div class="container">
      <div class="row">
        <div class="col-md-6 mx-auto text-center">
          <h1 class="mb-3">Profile Scroller</h1>
          <div id="imageDisplay"></div>
          <br>
          <div id="profileDisplay"></div>
          <br>
          <button id="next" class="btn btn-dark btn-block">Next</button>
        </div>
      </div>
    </div>
    
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>

    <script src="app.js"></script>
  </body>
</html>