1. error message:Client does not support authentication protocol requested by server; consider upgrading MySQL client
   
2. solution
   Open the dbeaver and run the following SQL
   Alter user 'root'@'localhost' identify with mysql_native_password by ';
3. Run node.js again, successfully connect to the database

const mySql = require('mysql')
const db = mySql.createConnection({
    
    host: "localhost",
    user: "root",
    password: "19980404",
    database: "sys"
})
db.connect()
db.query('select * from user', (err, data) => {
    
    if(err) {
    
        console.log(err);
        return console.log('query failed')
    }
    console.log(data);
})