代码地址 app/helpers/likes_helper.rb

like_label = raw "#{icon} <span>#{label}</span>" 
link_to(like_label,"#",:title => title, :rel => "twipsy", 'data-count' => likeable.likes_count,
        'data-state' => state,'data-type' => likeable.class,'data-id' => likeable.id,
        :class => 'likeable', :onclick => "return App.likeable(this);")

代码地址 app/assets/javascripts/app.coffee

likeable : (el) ->           
    $el = $(el)                
    likeable_type = $el.data("type")
    likeable_id = $el.data("id")
    likes_count = parseInt($el.data("count"))
    if $el.data("state") != "liked"
      $.ajax
        url : "/likes"         
        type : "POST"          
        data :                 
          type : likeable_type 
          id : likeable_id     

      likes_count += 1         
      $el.data('count', likes_count)
      App.likeableAsLiked(el

不明白 likeable_type = $el.data("type") 这样的代码，在 HTML 中生成了明明是 data-type: xxxx，那 $el.data("type") 是怎么回事？？ data 和 type 怎么能够分开呢？？求解