backend.md

1. mysql8.0 Navicat连接报错 Client does not support authentication protocol requested by server; consider upgrading MySQL client。 解决方案：

USE mysql;
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '你的密码';
FLUSH PRIVILEGES;

mongodb

@5.2.8之后

1. 消除部分警告collection.ensureIndex is deprecated 解决方案

mongoose.set('useNewUrlParser', true);
mongoose.set('useFindAndModify', false);
mongoose.set('useCreateIndex', true);