javascript console.log 내용 저장하기

 

 

const fs = require('fs');
const readline = require('readline');


// date and time
function getToday(){
  let date_ob = new Date();
  let year = date_ob.getFullYear();
  let month = ('0'+(date_ob.getMonth() + 1)).slice(-2);
  let date = ('0'+date_ob.getDate()).slice(-2);
  return year + '-' + month  + '-' + date;
}
function getTime(){
  let date_ob = new Date();
  let hours = ('0'+date_ob.getHours()).slice(-2);
  let minutes = ('0'+date_ob.getMinutes()).slice(-2);
  let seconds = ('0'+date_ob.getSeconds()).slice(-2);
  return hours + ':' + minutes + ':' + seconds;
}
function getTimeMilli(){
  return getTime() + '.' + new Date().getMilliseconds();
}


// logger
function fntLogger(level, data, option, setText){
  let fd = fs.openSync('logs/js_'+getToday()+'.log', 'a');
  try{
    data = '['+getToday()+' '+getTimeMilli()+'] ['+level+'] ' + data;
    fs.appendFileSync(fd, data + (undefined != option && null != option ? ' '+option.getInnerHTML() : '') + '\n', 'utf8');
    if(null == setText) console.log(data, option);
    else console.log('%c' + data, setText, option);
  }catch(err){
  }finally{
    if(fd !== undefined) fs.closeSync(fd);
  }
}

var logger = {
  debug: function(data, option){
    if(true == isDev) fntLogger('debug', data, option);
  }
  , info: function(data, option){
    fntLogger('info', data, option);
  }
  , warn: function(data, option){
    fntLogger('warn', data, option, 'color:orange; font-weight:bold; font-size: 13px;');
  }
  , error: function(data, option){
    fntLogger('error', data, option, 'color:red; font-weight:bold; font-size: 15px;');
  }
  , fatal: function(data, option){
    fntLogger('fatal', data, option, 'color:red; font-weight:bold; font-size: 18px;');
  }
}

logger.debug('[debug]');
logger.info('[info]');
logger.warn('[warn]');
logger.error('[error]');
logger.fatal('[fatal]');

 

javascript 만 사용하여 구현하기는 어려워 node 를 사용하여 구현함