我正在用mysql事件创建一个节点应用程序进行测试，它在某种程度上可以正常工作，但是除非添加 console.log(event); 对剧本。。？
当我更改数据库时，此代码不输出任何内容：

var MySQLEvents = require('mysql-events');

var dsn = {
  host:     'localhost',
  user:     'root',
  password: ''
};
var myCon = MySQLEvents(dsn);

var event1 = myCon.add(
  'db.test.name.value',
  function (oldRow, newRow, event) {
    if (oldRow !== null && newRow !== null) {
      console.log("DB change")
    }
  }, 
  'Active'
);

var MySQLEvents = require('mysql-events');
var dsn = {
  host:     'localhost',
  user:     'root',
  password: '',
};
var mysqlEventWatcher = MySQLEvents(dsn);
var watcher =mysqlEventWatcher.add(
  'experimental.test',
  function (oldRow, newRow, event) {
     //row inserted 
    if (oldRow === null) {
      console.log("Row inserted");
    }

     //row deleted 
    if (newRow === null) {
      console.log("Row deleted");
    }

     //row updated 
    if (oldRow !== null && newRow !== null) {
      console.log("Row updated");
    }

    //detailed event information 
    //console.log(event);
  }, 

);

此代码输出适当的 console.log :

var MySQLEvents = require('mysql-events');

var dsn = {
  host:     'localhost',
  user:     'root',
  password: ''
};
var myCon = MySQLEvents(dsn);

var event1 = myCon.add(
  'db.test.name.value',
  function (oldRow, newRow, event) {
    if (oldRow !== null && newRow !== null) {
      console.log("DB change")
    }
  }, 
  'Active'
);

var MySQLEvents = require('mysql-events');
var dsn = {
  host:     'localhost',
  user:     'root',
  password: '',
};
var mysqlEventWatcher = MySQLEvents(dsn);
var watcher =mysqlEventWatcher.add(
  'experimental.test',
  function (oldRow, newRow, event) {
     //row inserted 
    if (oldRow === null) {
      console.log("Row inserted");
    }

     //row deleted 
    if (newRow === null) {
      console.log("Row deleted");
    }

     //row updated 
    if (oldRow !== null && newRow !== null) {
      console.log("Row updated");
    }

    //detailed event information 
    console.log(event);
  }, 

);

唯一的区别是在脚本的底部，在第一个代码块中 console.log(event); 已注解掉，但不在第二个中。为什么会这样？