
wb = xlsx_package.workbook
# wb.use_autowidth = false
wb.styles do |s|
  sz_all = s.add_style :border => { :style => :thin, :color =>"000000" },:alignment => {:horizontal => :center}
  blue_cell = s.add_style :bg_color => "FAEBDC", :sz => 10,:height => 20,:b => true, :border => { :style => :thin, :color =>"000000" },:alignment => {:horizontal => :center}
  wb.add_worksheet(:name => "学生成绩") do |sheet|
    sheet.sheet_view.show_grid_lines = false
    sheet.add_row table_columns, :style => blue_cell
    if task_users.count > 0
      task_users.each do |user|
        sheet.add_row user, :height => 20,:style => sz_all
      end  #each_widh_index
    end
    sheet.column_widths *([20]*sheet.column_info.count)
    sheet.column_info.first.width = 12
  end  #add_worksheet
end