导出实训反馈编码格式修改

app/controllers/managements_controller.rb

@@ -812,7 +812,7 @@ class ManagementsController < ApplicationController
       format.xls{
         shixun_ids = @all_discusses.pluck(:dis_id).uniq
         filename = "#{Time.now.strftime("%Y%m%d")}-实训反馈.xls"
-        send_data(shixun_feedback_xls(shixun_ids), :type => 'application/octet-stream', :filename => filename_for_content_disposition(filename))
+        send_data(shixun_feedback_xls(shixun_ids), :type => "text/excel;charset=utf-8; header=present", :filename => filename_for_content_disposition(filename))
       }
     end
   end