无法使用 javascript 从 json 获取 url

Question

我正在尝试使用 last.fm 的 spotify scrobble api 将 url 设为我最近播放的歌曲的专辑图片。我能够获取歌曲名称和艺术家，但歌曲专辑图片的 link 文本返回 "object%20Object" 或 "object Object"。

var img = new Image();
    img.setAttribute("src", $.get("https://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user=plggs&api_key=MY_API_KEY&limit=1&format=json", function (data, status) {
        $("#album-art").html(data["recenttracks"]["track"][0]["image"][2]['#text']);
    }));
    img.setAttribute("class", "album-img");
    img.setAttribute("alt", "album");
    document.getElementById("album-art-div").appendChild(img);

这是 last.fm 返回的 json：

{"recenttracks":{"track":[{"artist":{"#text":"Jason Mraz","mbid":"82eb8936-7bf6-4577-8320-a2639465206d"},"name":"I Won't Give Up","streamable":"0","mbid":"7a49cb65-1f22-4334-b139-6500c2e79ee5","album":{"#text":"I Won't Give Up","mbid":"6e680b82-fa31-4342-87b6-1c306d4fb90c"},"url":"https://www.last.fm/music/Jason+Mraz/_/I+Won%27t+Give+Up","image":[{"#text":"https://lastfm-img2.akamaized.net/i/u/34s/6288819e941d491584fa6fa66b8e903f.png","size":"small"},{"#text":"https://lastfm-img2.akamaized.net/i/u/64s/6288819e941d491584fa6fa66b8e903f.png","size":"medium"},{"#text":"https://lastfm-img2.akamaized.net/i/u/174s/6288819e941d491584fa6fa66b8e903f.png","size":"large"},{"#text":"https://lastfm-img2.akamaized.net/i/u/300x300/6288819e941d491584fa6fa66b8e903f.png","size":"extralarge"}],"date":{"uts":"1517936832","#text":"06 Feb 2018, 17:07"}}],"@attr":{"user":"PlGGS","page":"1","perPage":"1","totalPages":"103","total":"103"}}}

有谁知道如何具体获取相册的 'extralarge' 图片 url？

Answer 1

仅设置一次 src get returns:

在这个例子中，我没有调用 API，因为我没有 API 键。

我的 setTimeout 函数模拟异步 API 调用。

直到 API returns。

之前，我也不会创建图像或设置其 src

// I don't have an API KEY so this is commented out
/*
$.get("https://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user=plggs&api_key=MY_API_KEY&limit=1&format=json", 
  function (data, status) {
    var img = new Image();
    img.setAttribute("class", "album-img");
    img.setAttribute("alt", "album");
    document.getElementById("album-art-div").appendChild(img);
    img.setAttribute("src", data.recenttracks.track[0].image[2]['#text']);
  }
);
*/

// This code emulates the API call.
setTimeout(
  function() {
    var data = {"recenttracks":{"track":[{"artist":{"#text":"Jason Mraz","mbid":"82eb8936-7bf6-4577-8320-a2639465206d"},"name":"I Won't Give Up","streamable":"0","mbid":"7a49cb65-1f22-4334-b139-6500c2e79ee5","album":{"#text":"I Won't Give Up","mbid":"6e680b82-fa31-4342-87b6-1c306d4fb90c"},"url":"https://www.last.fm/music/Jason+Mraz/_/I+Won%27t+Give+Up","image":[{"#text":"https://lastfm-img2.akamaized.net/i/u/34s/6288819e941d491584fa6fa66b8e903f.png","size":"small"},{"#text":"https://lastfm-img2.akamaized.net/i/u/64s/6288819e941d491584fa6fa66b8e903f.png","size":"medium"},{"#text":"https://lastfm-img2.akamaized.net/i/u/174s/6288819e941d491584fa6fa66b8e903f.png","size":"large"},{"#text":"https://lastfm-img2.akamaized.net/i/u/300x300/6288819e941d491584fa6fa66b8e903f.png","size":"extralarge"}],"date":{"uts":"1517936832","#text":"06 Feb 2018, 17:07"}}],"@attr":{"user":"PlGGS","page":"1","perPage":"1","totalPages":"103","total":"103"}}};
    var img = new Image();
    img.setAttribute("class", "album-img");
    img.setAttribute("alt", "album");
    document.getElementById("album-art-div").appendChild(img);
    img.setAttribute("src", data.recenttracks.track[0].image[2]['#text']);

  },500
);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="album-art-div"></div>

无法使用 javascript 从 json 获取 url

Can't get url from json using javascript

html

javascript

last.fm