javascript - 尝试从 Google Books API append 信息时获取对象 Object

Question

我正在使用 Googlebooks API 开发一个项目，但是当我尝试将数据 append 到 DOM 上时，我得到了 [object Object]。

$('button').on('click', function(){
  //code below allows you to pick between buttons so that it gives you different results
  var x = $(this).data('search');
  console.log(x);
  //code below pulls the results from the google api key. 
  var queryURL = ' https://www.googleapis.com/books/v1/volumes?q=+genres'+x+'&api_key=AIzaSyAHjfwSHwLklSKp1lb38metYYW-gtt5tY4&limit=10';
  console.log(queryURL);
  //code below is acutual api call
  $.ajax({url:queryURL,method:'GET'})
    .done(function(response){
      console.log(response.items[0].volumeInfo);
      //to get the results on the page
      $('#body').append('<span>'+response.items[0].volumeInfo+'</span>');
    })
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="body">
  <button>Click Me</button>
</div>

我做错了什么？

Answer 1

您得到[object Object]的原因是因为您正在尝试将Javascript对象添加到屏幕(显示在控制台中)。

要解决此问题，您必须单独输出每个属性(例如 response.items[0].volumeInfo.title ，它将返回 “古英语、古冰岛语和盎格鲁语的朗文选集-诺曼文学”)

将整个对象输出为字符串的简单方法可能是使用 JSON.stringify()，但您可能希望通过输出各个属性来更好地格式化结果。请参阅下面的非格式化结果。

$('button').on('click', function(){
  //code below allows you to pick between buttons so that it gives you different results
  var x = $(this).data('search');
  console.log(x);
  //code below pulls the results from the google api key. 
  var queryURL = ' https://www.googleapis.com/books/v1/volumes?q=+genres'+x+'&api_key=AIzaSyAHjfwSHwLklSKp1lb38metYYW-gtt5tY4&limit=10';
  console.log(queryURL);
  //code below is acutual api call
  $.ajax({url:queryURL,method:'GET'})
    .done(function(response){
      console.log(response.items[0].volumeInfo);
      //to get the results on the page
      $('#body').append('<span>'+JSON.stringify(response.items[0].volumeInfo)+'</span>');
    })
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="body">
  <button>Click Me</button>
</div>

还有一些格式:

$('button').on('click', function(){
  //code below allows you to pick between buttons so that it gives you different results
  var x = $(this).data('search');
  console.log(x);
  //code below pulls the results from the google api key. 
  var queryURL = ' https://www.googleapis.com/books/v1/volumes?q=+genres'+x+'&api_key=AIzaSyAHjfwSHwLklSKp1lb38metYYW-gtt5tY4&limit=10';
  console.log(queryURL);
  //code below is acutual api call
  $.ajax({url:queryURL,method:'GET'})
    .done(function(response){
      console.log(response.items[0].volumeInfo);
      //to get the results on the page
      $('#body').append(
        '<p>Tilte: '+response.items[0].volumeInfo.title+'</p>' +        
        '<p>Authors: '+response.items[0].volumeInfo.authors.join(", ")+'</p>'
      );
    })
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="body">
  <button>Click Me</button>
</div>