subject.js

var isAlbumSoundtrack = function() {
  var result;

  $infos = $("#info").find('span.pl');
  $infos.each(function(index, info){
    if ($(info).text().indexOf("相关电影") != -1) {
      result = true;
    }
  });

  return result;
}

if (/^https?:\/\/music.douban.com\/subject\/\d+\/$/.test(location.href)) {
  var album = $('h1 span').text();
  // artist will be in first or 2nd span
  var artist = $('#info span:first a').text() || $('#info span:eq(2) a').text();

  var showAlbumsMenu = function (albums, isOpenSpotifyDirect) {
    $('<h2><span class="spotify-btn"></span>'.concat(album, ' on Spotify</h2><div id="spotify-items"></div>')).prependTo('.aside');
    var albumsMenu = $('#spotify-items');
    $.each(albums, function (idx, album) {
      var link = isOpenSpotifyDirect ? album.uri : 'http://open.spotify.com/album/'.concat(album.uri.split(':')[2]),
          target = isOpenSpotifyDirect ? '' : '_blank';
      $('<a class="spotify-item" href="'.concat(link, '" target="', target, '"><span>', album.name, ' - ', artist, '</span></a>'))
        .appendTo(albumsMenu).hover(
          function () {
            $(this).addClass('mover');
          }, function () {
            $(this).removeClass('mover');
          });
    });
    return albumsMenu;
  };

  if (!isAlbumSoundtrack()) {
    album = album.concat(' ', artist);
  }
  chrome.extension.sendRequest({method:"queryAlbums", title:album}, function (ret) {
    if (ret.albums.total && ret.albums.total > 0) {
      showAlbumsMenu(ret.albums.items, ret.isOpenSpotifyDirect);
    }    
  });
}