为什么我的缩略图的ytdl信息是对象？

Question

我的信息缩略图是一个对象，如果是这样，那么我如何获得URL？因为我想用缩略图做一个嵌入，

let info = ytdl.getInfo(url);
let song = {
.
.
.
thumbnail: info.videoDetails.thumbnail
}

let embed = new Discord.MessageEmbed()
.setTitle('title')
.setThumbnail(*Place the url here*);

//But I can't because ytdl.videoDetails.thumbnail is an Object

我也尝试过ytdl.thumbnail_url，但总是返回未定义的结果。我该如何解决这个问题？

编辑:我找到了解决方案，我做了一个解析信息的函数，我做了resolve.videoDetails.thumbnail.thumbnails，但我的问题是所有缩略图数组之间的区别是什么？其输出如下所示：

2020-11-11T09:10:52.637829+00:00 app[Worker.1]: {
2020-11-11T09:10:52.637859+00:00 app[Worker.1]:   url: 'https://i.ytimg.com/vi/60ItHLz5WEA/hqdefault.jpg?sqp=-oaymwEiCKgBEF5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLAzsxKizpa2mZYBrOH005QuoyAdFg',
2020-11-11T09:10:52.637859+00:00 app[Worker.1]:   width: 168,
2020-11-11T09:10:52.637860+00:00 app[Worker.1]:   height: 94
2020-11-11T09:10:52.637860+00:00 app[Worker.1]: }
2020-11-11T09:10:52.638123+00:00 app[Worker.1]: {
2020-11-11T09:10:52.638124+00:00 app[Worker.1]:   url: 'https://i.ytimg.com/vi/60ItHLz5WEA/hqdefault.jpg?sqp=-oaymwEiCMQBEG5IWvKriqkDFQgBFQAAAAAYASUAAMhCPQCAokN4AQ==&rs=AOn4CLDQGF6CaUYDS1CTr7F-d4wHUwIbHQ',
2020-11-11T09:10:52.638124+00:00 app[Worker.1]:   width: 196,
2020-11-11T09:10:52.638125+00:00 app[Worker.1]:   height: 110
2020-11-11T09:10:52.638125+00:00 app[Worker.1]: }
2020-11-11T09:10:52.638351+00:00 app[Worker.1]: {
2020-11-11T09:10:52.638352+00:00 app[Worker.1]:   url: 'https://i.ytimg.com/vi/60ItHLz5WEA/hqdefault.jpg?sqp=-oaymwEjCPYBEIoBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLDAHBlU1s8kk2TDD-4QIPK5uWi82g',
2020-11-11T09:10:52.638353+00:00 app[Worker.1]:   width: 246,
2020-11-11T09:10:52.638353+00:00 app[Worker.1]:   height: 138
2020-11-11T09:10:52.638353+00:00 app[Worker.1]: }
2020-11-11T09:10:52.638512+00:00 app[Worker.1]: {
2020-11-11T09:10:52.638513+00:00 app[Worker.1]:   url: 'https://i.ytimg.com/vi/60ItHLz5WEA/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLAHEApS5HDlKsdjg0HSscTqdFZwxg',
2020-11-11T09:10:52.638514+00:00 app[Worker.1]:   width: 336,
2020-11-11T09:10:52.638514+00:00 app[Worker.1]:   height: 188
2020-11-11T09:10:52.638514+00:00 app[Worker.1]: }
2020-11-11T09:10:52.638681+00:00 app[Worker.1]: {
2020-11-11T09:10:52.638683+00:00 app[Worker.1]:   url: 'https://i.ytimg.com/vi/60ItHLz5WEA/maxresdefault.jpg',
2020-11-11T09:10:52.638684+00:00 app[Worker.1]:   width: 1920,
2020-11-11T09:10:52.638684+00:00 app[Worker.1]:   height: 1080
2020-11-11T09:10:52.638684+00:00 app[Worker.1]: }

Answer 1

如果想要从缩略图对象中获取缩略图url，可以使用JSON.stringify

如下所示：JSON.stringify(info.videoDetails.thumbnail.thumbnails[0]); [0]指定您想要第一个缩略图(有多个不同大小的缩略图)。在此之后，您可能会想出如何获取url。