socialforge/app/views/layouts/_join_exit_project.html.erb

<div class="pr_info_join fl">
   <!--关注项目-->
  <% if ( !(User.current.member_of? @project) && User.current.login?) %>   <!--added by linchun-->
      <span><%= watcher_link_for_project(@project, User.current) %></span>
  <% end %>
  <!--加入项目 -->
  <% if ( !(User.current.member_of? @project) && User.current.login?) %>
      <%= join_in_project_link(@project, User.current) %>
  <% end %>
  <!--退出项目-->
  <% if ((User.current.member_of? @project) &&
          User.current.login? &&
          Member.where(:user_id => User.current.id, :project_id=>@project.id).first.roles.first.to_s != "Manager") %>
      <%= exit_project_link(@project) %>
  <% end %>
</div>