• <%= link_to '课程列表', {:action => 'syllabuses'}, class: "#{current_page?(all_syllabuses_path)? 'selected' : nil }" %>
• <%= link_to '全部班级列表', {:action => 'courses'}, class: "#{current_page?(all_courses_path)? 'selected' : nil }" %>
• <%= link_to '未配置班级列表', {:action => 'non_syllabus_courses'}, class: "#{current_page?(non_syllabus_courses_path)? 'selected' : nil }" %>