Nodejs 使用log4js日誌

1、建立log4.js文件，保存日誌到log文件，並在控制檯輸出，若是不控制檯輸出，把刪除紅色的代碼

const log4js = require('log4js'),
        path = require('path')
 
log4js.configure({
    replaceConsole: true,
    appenders: {
        stdout: {//控制檯輸出
             type: 'console' },
        trace: {
            type: 'dateFile',
            filename: 'logs/tracelog/',
            pattern: 'trace-yyyy-MM-dd.log',
            alwaysIncludePattern: true
        },
        debug: {
            type: 'dateFile',
            filename: 'logs/debuglog/',
            pattern: 'debug-yyyy-MM-dd.log',
            alwaysIncludePattern: true
        },
        info: {
            type: 'dateFile',
            filename: 'logs/infolog/',
            pattern: 'info-yyyy-MM-dd.log',
            alwaysIncludePattern: true
        },
        warn: {
            type: 'dateFile',
            filename: 'logs/warnlog/',
            pattern: 'warn-yyyy-MM-dd.log',
            alwaysIncludePattern: true
        },
        error: {
            type: 'dateFile',
            filename: 'logs/errorlog/',
            pattern: 'error-yyyy-MM-dd.log',
            alwaysIncludePattern: true
        },
        fatal: {
            type: 'dateFile',
            filename: 'logs/fatallog/',
            pattern: 'fatal-yyyy-MM-dd.log',
            alwaysIncludePattern: true
        },
    },
    categories: {
        trace: { appenders: ['stdout', 'trace'], level: 'trace' },//appenders:採用的appender,取appenders項,level:設置級別
        debug: { appenders: ['stdout', 'debug'], level: 'debug' },
        default: { appenders: ['stdout', 'info'], level: 'info' },
        warn: { appenders: ['stdout', 'warn'], level: 'warn' },
        error: { appenders: ['stdout', 'error'], level: 'error' },
        fatal: { appenders: ['stdout', 'fatal'], level: 'fatal' },
    }
})
 
exports.getLogger = function (name) {//name取categories項
    return log4js.getLogger(name || 'info')
}
 
exports.useLogger = function (app, logger) {//用來與express結合
    app.use(log4js.connectLogger(logger || log4js.getLogger('info'), {
        format: '[:remote-addr :method :url :status :response-timems][:referrer HTTP/:http-version :user-agent]'//自定義輸出格式
    }))
}

2、引用log4.js調用

const log4js  = require("../log4js/log4Builder"),
        logger  = log4js.getLogger("info")

        logger.info("如今時間：",new Date().toLocaleString())
        logger.trace("如今時間：",new Date().toLocaleString())
        logger.debug("如今時間：",new Date().toLocaleString())
        logger.info("如今時間：",new Date().toLocaleString())
        logger.warn("如今時間：",new Date().toLocaleString())
        logger.error("如今時間：",new Date().toLocaleString())
        logger.fatal("如今時間：",new Date().toLocaleString())