数据库执行：

alter table typecho_comments convert to character set utf8mb4 collate utf8mb4_general_ci;
alter table typecho_contents convert to character set utf8mb4 collate utf8mb4_general_ci;
alter table typecho_fields convert to character set utf8mb4 collate utf8mb4_general_ci;
alter table typecho_metas convert to character set utf8mb4 collate utf8mb4_general_ci;
alter table typecho_options convert to character set utf8mb4 collate utf8mb4_general_ci;
alter table typecho_meting convert to character set utf8mb4 collate utf8mb4_general_ci;
alter table typecho_relationships convert to character set utf8mb4 collate utf8mb4_general_ci;
alter table typecho_users convert to character set utf8mb4 collate utf8mb4_general_ci;

config.inc.php文件修改

$db = new Typecho_Db('Pdo_Mysql', 'typecho_');
$db->addServer(array (
'host' => 'localhost',
'user' => '这是你的数据库名',
'password' => '你数据的密码',
'charset' => 'utf8mb4', // 将原来的utf8修改为 utf8mb4
'port' => '这是你的数据库端口',
'database' => '这是你的数据库名',