Rap does not support Emoji symbol preservation（rap不支持emoji符号保存）

[yiniing]

If MySQL is used as storage, because of the special utf8 of MySQL, it is necessary to modify the configuration of the database, or to encode and store the Emoji symbol, and then to decode it after querying.（如果使用mysql作为存储，由于mysql特殊的utf8，需要修改数据库的配置，或者对emoji符号进行编码再存储，查询之后再解码回来）