log4js 配置

const log4js = require('log4js');

log4js.configure({
  appenders: {
    file: { type: 'file', filename: 'application.log' }
  },
  categories: {
    default: { appenders: ['file'], level: 'debug' }
  }
});

const logger = log4js.getLogger();
logger.debug('This is a debug message');

const log4js = require('log4js');

log4js.configure({
  appenders: {
    console: { type: 'console' },
    file: { type: 'file', filename: 'application.log' }
  },
  categories: {
    default: { appenders: ['console', 'file'], level: 'debug' }
  }
});

const logger = log4js.getLogger();
logger.info('This is an info message');

const log4js = require('log4js');

log4js.configure({
  appenders: {
    console: {
      type: 'console',
      layout: {
        type: 'pattern',
        pattern: '%d{yyyy-MM-dd hh:mm:ss} %-5p %c - %m%n'
      }
    }
  },
  categories: {
    default: { appenders: ['console'], level: 'debug' }
  }
});

const logger = log4js.getLogger();
logger.warn('This is a warning message');