判断用户离线在线隐身

<%if @user.online==1%>	
当前在线
<img src="invisible.small.gif" alt="隐身草" class="magicicon"><a id="a_magic_invisible" href="magic.php?mid=invisible" onclick="ajaxmenu(event,this.id,1)" class="gray">我要隐身</a>
<%elsif @user.online==2&&@user.id==session[:user].id%>
隐身状态
<%else%>
离线状态&nbsp; <%d=0%> 
 <%if obj.last_logout&&obj.last_login%>
      <%if obj.last_logout.strftime('%Y-%m-%d %H:%M') > obj.last_login.strftime('%Y-%m-%d %H:%M')%>
		 	<%=online_state "last_logout"%>
      <%else%>
		 	<%=online_state "last_login"%>
      <%end%>
 <%end%>

<%end%>



module UsersHelper
  def online_state (time)
    h =""
     d=0
     d=d+obj.send(time).strftime('%d').to_i*24*60
     d=d+obj.send(time).strftime('%H').to_i*60
     d=d+obj.send(time).strftime('%M').to_i
     z=Time.now.strftime('%d').to_i*24*60+Time.now.strftime('%H').to_i*60+Time.now.strftime('%M').to_i-d
         if z>24*60
          h  += (Time.now.strftime('%d').to_i-obj.send(time).strftime('%d').to_i).to_s+"天前"
         elsif 60<z
          h  += (Time.now.strftime('%H').to_i-obj.send(time).strftime('%H').to_i).to_s+"小时前"
         else
          h  += (Time.now.strftime('%M').to_i-obj.send(time).strftime('%M').to_i).to_s+"分钟前"
         end
      h
  end
end