笔记

log4js的使用

Nodejs, 笔记

log4js的使用

安装：

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npm install log4js

定义：logger.js

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'use strict';

let moment = require('moment'); // 日期处理
let chalk = require('chalk'); // 字体颜色
let log4js = require('log4js');

log4js.configure({
    appenders: {
        console: {type: 'console'},
        debugFileJohn: {// 个人debug日志
            type: 'dateFile',
            filename: 'logs/john-',
            pattern: 'yyyy-MM-dd.log',
            maxLogSize: 10 * 1000 * 1000,
            numBackups: 3,
            alwaysIncludePattern: true
        },
        debugFile: {
            type: 'dateFile',
            filename: 'logs/debug-',
            pattern: 'yyyy-MM-dd.log',
            maxLogSize: 10 * 1000 * 1000,
            numBackups: 3,
            alwaysIncludePattern: true
        }
    },
    categories: {
        default: {appenders: ['console'], level: 'info'},
        john: {appenders: ['console', 'debugFileJohn'], level: 'debug'},
        debug: {appenders: ['console', 'debugFile'], level: 'debug'},
    }
});

let johnLogger = log4js.getLogger('john');

exports.OFF = -1;
exports.DEBUG = 1;
exports.INFO = 2;
exports.WARN = 3;
exports.ERROR = 4;

let log_level = require("../config.js").log_level || exports.DEBUG; // 默认日志级别 DEBUG

function now() {
    return '[' + moment().format('YYYY-MM-DD HH:mm:ss.SSS') + ']';
}

function john(msg, showLog = true) {
    if (log_level === exports.OFF || !showLog)
        return;

    if (log_level <= exports.DEBUG) {
        johnLogger.info(now() + ' [DEBUG] ' + msg);
        johnLogger.info(chalk.yellow("----------------------------------------------------------------------------------------------"));
    }
}
exports.john = john;

使用：

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/**
 * 全局变量定义
 */
let log = require('./utils/logger.js');
global.Log = log;//打印日志工具
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Log.john('a:' + a + ' b:' + b);