<% if is_praise_homework User.current.id,@work.id  %>
    <%= link_to "赞(#{praise_homework_count @work.id})",praise_student_work_student_work_path(@work), :remote => true,:class => 'orange_btn', :style => 'font-size:12px;'%>
<% else %>
    <%= link_to "赞(#{praise_homework_count @work.id})","javascript:void(0)",:class => 'grey_btn', :style => 'font-size:12px;'%>
<% end %>