编辑 dvwa/config/config.inc.php这个配置文件
$_DVWA[ 'recaptcha_public_key' ] = '';
$_DVWA[ 'recaptcha_private_key' ] = '';
key可以自己生成，地址是
https://www.google.com/recaptcha/admin/create
下面这个是我自己生成的，随便用
Site key:
6LdJJlUUAAAAAH1Q6cTpZRQ2Ah8VpyzhnffD0mBb
Secret key:
6LdJJlUUAAAAAM2a3HrgzLczqdYp4g05EqDs-W4K
把key填上就行了
$_DVWA[ 'recaptcha_public_key' ] = '6LdJJlUUAAAAAH1Q6cTpZRQ2Ah8VpyzhnffD0mBb';
$_DVWA[ 'recaptcha_private_key' ] = '6LdJJlUUAAAAAM2a3HrgzLczqdYp4g05EqDs-W4K';