如何在名称中使用 $(美元)符号引用 javascript 对象

Question

我正在尝试从gdata json中提取数据。但是，对象的名称带有美元符号：

{
   "id":{
      "$t":"tag:youtube.com,2008:video:xedvi0LiZDA"
   },
   "media$group":{
      "media$category":[
         {
            "$t":"Shows",
            "label":"Shows",
            "scheme":"http://gdata.youtube.com/schemas/2007/categories.cat"
         },
         {
            "$t":"6",
            "scheme":"http://gdata.youtube.com/schemas/2007/releasemediums.cat"
         },
         {
            "$t":"3",
            "scheme":"http://gdata.youtube.com/schemas/2007/mediatypes.cat"
         }
      ],
      "media$content":[
         {
            "url":"http://www.youtube.com/v/xedvi0LiZDA?version=3&f=user_uploads&app=youtube_gdata",
            "type":"application/x-shockwave-flash",
            "medium":"video",
            "isDefault":"true",
            "expression":"full",
            "duration":204,
            "yt$format":5
         },
         {
            "url":"rtsp://v8.cache5.c.youtube.com/CigLENy73wIaHwkwZOJCi2_nxRMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp",
            "type":"video/3gpp",
            "medium":"video",
            "expression":"full",
            "duration":204,
            "yt$format":1
         },
         {
            "url":"rtsp://v6.cache7.c.youtube.com/CigLENy73wIaHwkwZOJCi2_nxRMYESARFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp",
            "type":"video/3gpp",
            "medium":"video",
            "expression":"full",
            "duration":204,
            "yt$format":6
         }
      ],
      "media$credit":[
         {
            "$t":"epicnetworkmusic",
            "role":"uploader",
            "scheme":"urn:youtube",
            "yt$display":"EpicNetworkMusic",
            "yt$type":"partner"
         }
      ],
      "media$description":{
         "$t":"Our Facebook: http://on.fb.me/oW4u8e & T-Shirts: http://bit.ly/JSJebon---------------------------------------------------------------------------------------------------------------nComing out on the 'Believe in Music Foundation' album on the 15th Octobernhttp://www.facebook.com/pages/Believe-in-Music-Foundation/130288053775923nnSystemnFacebook: https://www.facebook.com/systemdancenSoundcloud: http://soundcloud.com/systemdancenYouTube: http://www.youtube.com/user/officialsystemukn---------------------------------------------------------------------------------------------------------------nAll the artwork & design is owned by Mike NesbittnnDeviantArt: http://vashperado.deviantart.com/nTumblr: http://vashito.tumblr.com/nTwitter: https://twitter.com/vashperado nnWallpaper Download: nhttp://vashperado.deviantart.com/art/s-p-a-c-e-o-u-t-264782890n---------------------------------------------------------------------------------------------------------------nEpic Network:nFacebook FanPage: http://on.fb.me/h2ubeHnTwitter: http://bit.ly/i4iqZanGoogle+ http://goo.gl/uO7n1nSoundcloud: http://bit.ly/e1XukrnnTrack's title: System - Circlesn---------------------------------------------------------------------------------------------------------------nSend demos to [e-mail] a possible release or get your track featured on ENR!nnWe'll get back to you if we like what we hear!n---------------------------------------------------------------------------------------------------------------",
         "type":"plain"
      },
      "media$keywords":[
      ],
      "media$license":{
         "$t":"youtube",
         "type":"text/html",
         "href":"http://www.youtube.com/t/terms"
      },
      "media$player":{
         "url":"http://www.youtube.com/watch?v=xedvi0LiZDA&feature=youtube_gdata_player"
      },
      "media$thumbnail":[
         {
            "url":"http://i.ytimg.com/vi/xedvi0LiZDA/default.jpg",
            "height":90,
            "width":120,
            "time":"00:01:42",
            "yt$name":"default"
         },
         {
            "url":"http://i.ytimg.com/vi/xedvi0LiZDA/mqdefault.jpg",
            "height":180,
            "width":320,
            "yt$name":"mqdefault"
         },
         {
            "url":"http://i.ytimg.com/vi/xedvi0LiZDA/hqdefault.jpg",
            "height":360,
            "width":480,
            "yt$name":"hqdefault"
         },
         {
            "url":"http://i.ytimg.com/vi/xedvi0LiZDA/1.jpg",
            "height":90,
            "width":120,
            "time":"00:00:51",
            "yt$name":"start"
         },
         {
            "url":"http://i.ytimg.com/vi/xedvi0LiZDA/2.jpg",
            "height":90,
            "width":120,
            "time":"00:01:42",
            "yt$name":"middle"
         },
         {
            "url":"http://i.ytimg.com/vi/xedvi0LiZDA/3.jpg",
            "height":90,
            "width":120,
            "time":"00:02:33",
            "yt$name":"end"
         }
      ],
      "media$title":{
         "$t":"Drum & Bass - System - Circles",
         "type":"plain"
      },
      "yt$aspectRatio":{
         "$t":"widescreen"
      },
      "yt$duration":{
         "seconds":"204"
      },
      "yt$uploaded":{
         "$t":"2012-09-24T22:47:33.000Z"
      },
      "yt$uploaderId":{
         "$t":"UCvOGElQWhX8tyTxwzv1rKzg"
      },
      "yt$videoid":{
         "$t":"xedvi0LiZDA"
      }
   },
}

我正在使用的Javascript如下：

  $.ajax({
    url: 'api/video.php',
    success: function(data) {
      //$('.result').html(data);
      alert(data.media$group.yt$videoid.$t); 
    }
  });

我得到的错误是：未捕获的类型错误：无法读取未定义的属性"yt$videoid"

Answer 1

我需要将 json 响应解析为一个对象：

  var video = jQuery.parseJSON(data);
  alert(video['media$group']['yt$videoid']['$t']);  //media$group.yt$videoid.$t