获取前缀：来自 XML RSS 提要的项目值

Posted 2023-02-24

【中文标题】获取前缀：来自 XML RSS 提要的项目值

【英文标题】：Getting a prefix: item value from an XML RSS feed

【发布时间】：2020-11-26 21:50:14

【问题描述】：

我正在尝试在客户端使用 JQuery 解析 XML。这是a Youtube channel RSS feed 的 sn-p / 示例：

  <published>2020-08-05T19:00:01+00:00</published>
  <updated>2020-08-05T22:20:16+00:00</updated>
  <media:group>
   <media:title>Ethan Gruska &quot;On The Outside&quot; - Late Show #PlayAtHome</media:title>
   <media:content url="https://www.youtube.com/v/8YPCM511lWQ?version=3" type="application/x-shockwave-flash"  />
   <media:thumbnail url="https://i1.ytimg.com/vi/8YPCM511lWQ/hqdefault.jpg"  />
   <media:description>Singer, songwriter and producer Ethan Gruska treats us to this #PlayAtHome performance of &quot;On The Outside,&quot; from his new album &quot;EN GARDE&quot; which is available now on Warner Records. #EthanGruska #OnTheOutside #PlayAtHome

我正在遍历整个文件，将所有 <item> 放入 item 变量中。

$.each(data.feedItems, function(index, item) 

    console.log('(%s) %s', feedUrl, JSON.stringify(item) + '\n');

(...)

这是上面的输出，您可以在其中看到我所追求的“描述”值：

07:49:58.627 (https://www.youtube.com/feeds/videos.xml?channel_id=UC3I2GFN_F8WudD_2jUZbojA) "title":"Chicano Batman (Live on KEXP at Home)","description":null,"summary":null,"date":"2020-08-07T01:25:49.000Z","pubdate":"2020-08-06T23:10:23.000Z","pubDate":"2020-08-06T23:10:23.000Z","link":"https://www.youtube.com/watch?v=jZhylCfqc9E","guid":"yt:video:jZhylCfqc9E","author":"KEXP","comments":null,"origlink":null,"image":"url":"https://i3.ytimg.com/vi/jZhylCfqc9E/hqdefault.jpg","source":,"categories":[],"enclosures":[],"atom:@":,"atom:id":"@":,"#":"yt:video:jZhylCfqc9E","yt:videoid":"@":,"#":"jZhylCfqc9E","yt:channelid":"@":,"#":"UC3I2GFN_F8WudD_2jUZbojA","atom:title":"@":,"#":"Chicano Batman (Live on KEXP at Home)","atom:link":"@":"rel":"alternate","href":"https://www.youtube.com/watch?v=jZhylCfqc9E","atom:author":"@":,"name":"@":,"#":"KEXP","uri":"@":,"#":"https://www.youtube.com/channel/UC3I2GFN_F8WudD_2jUZbojA","atom:published":"@":,"#":"2020-08-06T23:10:23+00:00","atom:updated":"@":,"#":"2020-08-07T01:25:49+00:00","media:group":"@":,"media:title":"@":,"#":"Chicano Batman (Live on KEXP at Home)","media:content":"@":"url":"https://www.youtube.com/v/jZhylCfqc9E?version=3","type":"application/x-shockwave-flash","width":"640","height":"390","media:thumbnail":"@":"url":"https://i3.ytimg.com/vi/jZhylCfqc9E/hqdefault.jpg","width":"480","height":"360","media:description":"@":,"#":"LA's Chicano Batman share a set of songs recorded exclusively for KEXP and join Morgan to talk live on Thursday, August 6, at 3pm PT.","media:community":"@":,"media:starrating":"@":"count":"418","average":"4.82","min":"1","max":"5","media:statistics":"@":"views":"7909","meta":"#ns":["xmlns:yt":"http://www.youtube.com/xml/schemas/2015","xmlns:media":"http://search.yahoo.com/mrss/","xmlns":"http://www.w3.org/2005/Atom"],"@":["xmlns:yt":"http://www.youtube.com/xml/schemas/2015","xmlns:media":"http://search.yahoo.com/mrss/","xmlns":"http://www.w3.org/2005/Atom"],"#xml":"version":"1.0","encoding":"UTF-8","#type":"atom","#version":"1.0","title":"KEXP","description":null,"date":"2006-07-07T16:39:26.000Z","pubdate":"2006-07-07T16:39:26.000Z","pubDate":"2006-07-07T16:39:26.000Z","link":"https://www.youtube.com/channel/UC3I2GFN_F8WudD_2jUZbojA","xmlurl":"http://www.youtube.com/feeds/videos.xml?channel_id=UC3I2GFN_F8WudD_2jUZbojA","xmlUrl":"http://www.youtube.com/feeds/videos.xml?channel_id=UC3I2GFN_F8WudD_2jUZbojA","author":"KEXP","language":null,"favicon":null,"copyright":null,"generator":null,"cloud":,"image":,"categories":[],"atom:@":"xmlns:yt":"http://www.youtube.com/xml/schemas/2015","xmlns:media":"http://search.yahoo.com/mrss/","xmlns":"http://www.w3.org/2005/Atom","atom:link":["@":"rel":"self","href":"http://www.youtube.com/feeds/videos.xml?channel_id=UC3I2GFN_F8WudD_2jUZbojA","@":"rel":"alternate","href":"https://www.youtube.com/channel/UC3I2GFN_F8WudD_2jUZbojA"],"atom:id":"@":,"#":"yt:channel:UC3I2GFN_F8WudD_2jUZbojA","yt:channelid":"@":,"#":"UC3I2GFN_F8WudD_2jUZbojA","atom:title":"@":,"#":"KEXP","atom:author":"@":,"name":"@":,"#":"KEXP","uri":"@":,"#":"https://www.youtube.com/channel/UC3I2GFN_F8WudD_2jUZbojA","atom:published":"@":,"#":"2006-07-07T16:39:26+00:00"
PTL.feed.js:269:17

我正在尝试访问 media:group 元素；我可以得到***的，比如item.published，但不是item['media:group']['media:description']，因为它总是返回[object Object]：|

我可以用什么方法来读取这个值？

【问题讨论】：

阅读How to Ask。邮政编码作为minimal reproducible example 的一部分。

【参考方案1】：

在您的示例中，媒体：描述是这样的：

"media:description": 
            "@": ,
            "#": "LA's Chicano Batman share a set of songs recorded exclusively for KEXP and join Morgan to talk live on Thursday, August 6, at 3pm PT."
        

这是一个对象。 （因此你的结果） 如果您想要文字，请尝试

item['media:group']['media:description']['#']

【讨论】：

是的，我终于想通了，谢谢；不知道这个“#”是从哪里来的，因为它不在原始 RSS 文件中……很奇怪。

#是从xml到json的映射。 # 保存元素的文本值。