请阅读此方法的用户说明:
http://php.net/manual/en/mysqli-stmt.get-result.php
它需要mysqlnd驱动程序…如果它没有安装在您的web空间上,您将不得不使用bind_result&fetch!
https://secure.php.net/manual/en/mysqli-stmt.bind-result.php
https://secure.php.net/manual/en/mysqli-stmt.fetch.php