消息闪现

def notice_message
   flash_messages = []
      flash.each do |type, message|
        type = :success if type.to_sym == :notice
        type = :danger  if type.to_sym == :alert
        text = content_tag(:div, link_to(raw('<button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button>'), '#', :class => 'close', 'data-dismi  ss' => 'alert') + message, class: "alert alert-#{type}")
        flash_messages << text if message
    end
    flah.clear
    flash_messages.join("\n").html_safe
    end

redirect_to root_url,notice:'hello'