log4js 日志管理

Github https://github.com/log4js-node/log4js-node
NPM https://www.npmjs.com/package/log4js

npm install log4js

日志类型

const log4js = require("log4js");
log4js.configure({
  appenders: { cheese: { type: "file", filename: "cheese.log" } },
  categories: { default: { appenders: ["cheese"], level: "error" } }
});
const logger = log4js.getLogger("cheese");
logger.trace("Entering cheese testing");
logger.debug("Got cheese.");
logger.info("Cheese is Comté.");
logger.warn("Cheese is quite smelly.");
logger.error("Cheese is too ripe!");
logger.fatal("Cheese was breeding ground for listeria.");

日志分级

从上到下，级别逐渐递增

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

参考 https://zhuanlan.zhihu.com/p/22110802

appenders 追加器

https://log4js-node.github.io/log4js-node/appenders.html

const log4js = require('log4js');
log4js.configure({
  appenders: {
    out: { type: 'stdout' },
    app: { type: 'file', filename: 'application.log' }
  },
  categories: {
    default: { appenders: [ 'out', 'app' ], level: 'debug' }
  }
});

log4 https://zhuanlan.zhihu.com/p/22110802

categories 日志类型