node.js用log4js实现日志

第一步先要安装 log4js

第二步需要创建logs文件夹

代码如下：

//npm install log4js 安装log4.js
const log4js = require('log4js');
log4js.configure({
  //appenders 配置的是文件存放的位置及log日志文件名称
  appenders: { cheese: { type: 'file','./logs/'+moment().format('YYYYMMDDHHmmss')+'LogFile.log' } },
  categories: { default: { appenders: ['cheese'], level: 'trace' } }
});

const logger = log4js.getLogger('cheese');
logger.trace('Entering cheese testing');
logger.debug('Got cheese.');
logger.info('Cheese is Gouda.');
logger.warn('Cheese is quite smelly.');
logger.error('Cheese is too ripe!');
logger.fatal('Cheese was breeding ground for listeria.');