今天在DEDE后台登陆时出现了问题,导致后台变成空白,再回头登陆时,登陆页面也是一片空白,查看源代码也是一片空白,在网上找了些资料解决了dedecms后台打开空白的解决方法: 
  找到:include/common.inc.php文件,打开,查找程序代码: 
  //error_reporting(E_ALL); 
  error_reporting(E_ALL || ~E_NOTICE); 
  替换为: 
  error_reporting(E_ALL); 
  //error_reporting(E_ALL || ~E_NOTICE); 
  这一步很重要,因为它会告诉你为什么变成空白的提示信息,保存之后再次进入管理后台,这个时候会发现后台会有错误提示了,根据错误提示来解决问题。
								
								
									原文提示是: 
Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\cwled\wwwroot\include\common.inc.php:1) in D:\wwwroot\junxiaowang\wwwroot\include\common.inc.php on line 290
Notice: A session had already been started - ignoring session_start() in D:\wwwroot\junxiaowang\wwwroot\include\userlogin.class.php on line 11
Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\cwled\wwwroot\include\common.inc.php:1) in D:\wwwroot\junxiaowang\wwwroot\cwled@guanli\config.php on line 14
Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\cwled\wwwroot\include\common.inc.php:1) in D:\wwwroot\junxiaownag\wwwroot\cwled@guanli\config.php on line 37 
								
								
									 
								
								
									 
								
								
									Notice: A session had already been started - ignoring session_start() in 的解决方法:
								
								
									在php.ini文件中查找session.auto_start ,将其值设为0:
								
								
									session.auto_start = 0
								
								
									 
								
								
									Warning: Cannot modify header information - headers already sent by (output started at 的解决方法:
								
								
									在php.ini文件中查找output_buffering = Off    把 Off修改成On
								
								
									重启Iis,根据以上错误把dedecms后台打开空白完美解决。