链接



简介
https://juejin.im/post/57b962af7db2a200542a0fb3

官方文档
https://log4js-node.github.io/log4js-node/terms.html

github
https://github.com/log4js-node/log4js-node

栗子

官方栗子
https://github.com/log4js-node/log4js-example

  1. {
  2.   "appenders": {
  3.     "access": {
  4.       "type": "dateFile",
  5.       "filename": "log/access.log",
  6.       "pattern": "-yyyy-MM-dd",
  7.       "category": "http"
  8.     },
  9.     "app": {
  10.       "type": "file",
  11.       "filename": "log/app.log",
  12.       "maxLogSize": 10485760,
  13.       "numBackups": 3
  14.     },
  15.     "errorFile": {
  16.       "type": "file",
  17.       "filename": "log/errors.log"
  18.     },
  19.     "errors": {
  20.       "type": "logLevelFilter",
  21.       "level": "ERROR",
  22.       "appender": "errorFile"
  23.     }
  24.   },
  25.   "categories": {
  26.     "default": {
  27.       "appenders": ["app", "errors"],
  28.       "level": "DEBUG"
  29.     },
  30.     "http": {
  31.       "appenders": ["access"],
  32.       "level": "DEBUG"
  33.     }
  34.   }
  35. }
  1. /**
  2.  * Initialise log4js first, so we don't miss any log messages
  3.  */
  4. var log4js = require('log4js');
  5. log4js.configure('./config/log4js.json');
  6. var log = log4js.getLogger("startup");
  7. var log = log4js.getLogger("app");



项目中使用的栗子
https://www.cnblogs.com/duhuo/p/5176154.html
注意, 这个栗子是旧版本的log4js

  1. {
  2.   "appenders": [{
  3.       "category": "console",
  4.       "type": "console"
  5.     },
  6.     {
  7.       "category": "log_info",
  8.       "type": "file",
  9.       "filename": "./logs/log_info/info.log",
  10.       "maxLogSize": 104857500,
  11.       "backups": 100
  12.     },
  13.     {
  14.       "category": "log_stat",
  15.       "type": "datefile",
  16.       "filename": "./logs/log_stat/stat"
  17.     },
  18.     {
  19.       "category": "log_trace",
  20.       "type": "datefile",
  21.       "filename": "./logs/log_trace/trace"
  22.     },
  23.     {
  24.       "category": "log_error",
  25.       "type": "datefile",
  26.       "filename": "./logs/log_error/error"
  28.     },
  29.     {
  30.       "category": "log_todo",
  31.       "type": "datefile",
  32.       "filename": "./logs/log_todo/todo"
  33.     }
  34.   ],
  35.   "replaceConsole": true,
  36.   "levels": {
  37.     "log_info": "ALL",
  38.     "log_stat": "ALL",
  39.     "log_trace": "ALL",
  40.     "log_error": "ALL",
  41.     "log_todo": "ALL"
  42.   }
  43. }

概念

总览


log4js - 图1
https://www.jianshu.com/p/9604d08db899

level

log4js - 图2

category

log4js.getLogger(‘somecategory’)

得到的结果:
[2016-08-21 01:16:00.212] [DEBUG] somecategory - Time: 2016-08-20T17:16:00.212Z

Appender


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



使用邮件

https://github.com/log4js-node/smtp

Annex