课程添加或者删除成员时，实时更新课程成员数量。

app/helpers/courses_helper.rb

@@ -36,7 +36,7 @@ module CoursesHelper
   #生成课程老师成员链接
   def course_teacher_link teacher_num
     if User.current.member_of_course?(@course) || User.current.admin?
-      link_to "#{teacher_num}", course_member_path(@course, :role => 1), :class => 'info_foot_num c_blue'
+      link_to "#{teacher_num}", course_member_path(@course, :role => 1), :class => 'info_foot_num c_blue', :id => 'teacher_number'
     else
       content_tag 'span',teacher_num, :class => 'info_foot_num c_blue'
     end
@@ -45,7 +45,7 @@ module CoursesHelper
   #生成课程学生列表连接
   def course_student_link student_num
     if (User.current.logged? && @course.open_student == 1) || (User.current.member_of_course?(@course)) || User.current.admin?
-      link_to "#{student_num}", course_member_path(@course, :role => 2), :class => 'info_foot_num c_blue'
+      link_to "#{student_num}", course_member_path(@course, :role => 2), :class => 'info_foot_num c_blue', :id => "student_number"
     else
       content_tag 'span',student_num, :class => 'info_foot_num c_blue'
     end

app/views/members/create.js.erb

@@ -12,6 +12,8 @@
         alert("<%= @create_member_error_messages%>");
     <% else%>
         $('#course_members_setting').html('<%= escape_javascript(render :partial => 'courses/course_members') %>');
+        $("#teacher_number").html("<%= searchTeacherAndAssistant(@course).count %>");
+        $("#student_number").html("<%= studentCount(@course) %>");
         alert("添加成功");
     <% end%>
     hideOnLoad();

app/views/members/destroy.js.erb

@@ -4,5 +4,7 @@
 //    $('#tab-content-members').html('<%#= escape_javascript(render :partial => 'projects/settings/members') %>');
   <%elsif @course%>
     $('#course_members_setting').html('<%= escape_javascript(render :partial => 'courses/course_members') %>');
+    $("#teacher_number").html("<%= searchTeacherAndAssistant(@course).count %>")
+    $("#student_number").html("<%= studentCount(@course) %>");
   <%end%>
 hideOnLoad();