1.bug appear
We normally use utf-8 type of field to give us a character encoding, for normal, no problems, such as name Yeah, gender and age, but encountered a problem is that if you can not store emoji expression into utf-8 encoding fields
2.mysql remaining issues
Through continuous inspection, I found that not the true meaning of utf8 the mysql utf8, and utf8 on utf8mb4 is the real meaning .. Therefore, we use mysql later time or to use a more appropriate coding utf8mb4.