text: //引入mysql模块
  const mysql=require('mysql');
  //创建连接池对象,自动建立连接
  var pool=mysql.createPool({
    host:'127.0.0.1',
    port:'3306',
    user:'root',
    password:'',
    database:'msj',
    connectionLimit:20
  });
  module.exports=pool;
  