fix bug

app/controllers/homework_commons_controller.rb

@@ -204,15 +204,17 @@ class HomeworkCommonsController < ApplicationController
           normal_status(-1,"暂无用户提交！")
         else
           respond_to do |format|
+            format.json{normal_status(0,"000000")}
             format.xlsx{
               student_work_to_xlsx(@work_excel,@homework)
               exercise_export_name = current_user.real_name + "_" + @course.name + "_" + @homework.name + "_" + Time.now.strftime('%Y%m%d_%H%M%S')
-
-              render xlsx: "#{exercise_export_name.encode(Encoding.default_external,"UTF-8", :invalid => :replace, :undef => :replace, :replace => " ").strip.first(30)}",template: "homework_commons/works_list.xlsx.axlsx",locals:
+              response.headers['Content-Disposition'] = "attachment; filename=\"#{exercise_export_name.strip.first(30)}\""
+              render xlsx: "#{exercise_export_name.strip.first(30)}",template: "homework_commons/works_list.xlsx.axlsx",locals:
                   {table_columns: @work_head_cells,task_users: @work_cells_column}
             }
+            # send_data data, :type => 'text/csv', :disposition => 'attachment; filename=my_file_name.csv'
 
-            # .encode(Encoding.default_external, 'gb2312')
+              # .encode(Encoding.default_external, 'gb2312')
           end
         end
       elsif params[:format] == "zip"