npm install

1. 跨域cors

npm install cors

const cors = require('cors');
app.use(cors());//设置跨域访问

2. 加密crypto

crypto.createHash('sha256').update('password').digest('hex');

3.缓存redis

npm install redis

4 数据库mysql

npm install mysql

var mysql = require('mysql');
var pool  = mysql.createPool({
  connectionLimit : 10,
  host            : 'example.org',
  user            : 'bob',
  password        : 'secret',
  database        : 'my_db'
});

pool.query('SELECT 1 + 1 AS solution', function(err, rows, fields) {
  if (err) throw err;

  console.log('The solution is: ', rows[0].solution);
});