MYSQL：ER_NOT_SUPPORTED_AUTH_MODE:Client does not support authentication protocol

Error: ER_BAD_DB_ERROR: Unknown database 'user'
    at Handshake.Sequence._packetToError (/Users/apple/Desktop/githubdoc/node/server/node_modules/mysql/lib/protocol/sequences/Sequence.js:47:14)
.....

node使用mysql报错。

原因：登录数据库的客户端跟mysql8.0不兼容了，mysql8.0密码认证采用了新的密码格式

解决办法：

　　在系统mysql终端输入下面命令

//password 是你的数据库账户密码，root和host也是
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';