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        日志模块log4js的配置说明

        1:先安装log4js模块  

          npm install log4js 

              目前安装的版本信息:"log4js": "^3.0.5"

        2:引用及配置

        var log4js = require(log4js);
        // log4js的输出级别6个: trace, debug, info, warn, error, fatal
        
        log4js.configure({
            //输出位置的基本信息设置
            appenders: {
                //设置控制台输出 (默认日志级别是关闭的(即不会输出日志))
                out: { type: console },
                //设置每天:以日期为单位,数据文件类型,dataFiel   注意设置pattern,alwaysIncludePattern属性
                //allLog: { type: ‘dateFile‘, filename: ‘./log/all‘, pattern: ‘-yyyy-MM-dd.log‘, alwaysIncludePattern: true },
        
                //所有日志记录,文件类型file   文件最大值maxLogSize 单位byte (B->KB->M) backups:备份的文件个数最大值,最新数据覆盖旧数据
                allLog: { type: file, filename: ./log/all.log, keepFileExt: true, maxLogSize: 10485760, backups: 3 },
        
                //http请求日志  http请求日志需要app.use引用一下, 这样才会自动记录每次的请求信息 
                httpLog: { type: "dateFile", filename: "log/httpAccess.log", pattern: ".yyyy-MM-dd", keepFileExt: true },
        
                //错误日志 type:过滤类型logLevelFilter,将过滤error日志写进指定文件
                errorLog: { type: file, filename: ./log/error.log },
                error: { type: "logLevelFilter", level: "error", appender: errorLog }
            },
            //不同等级的日志追加到不同的输出位置:appenders: [‘out‘, ‘allLog‘]  categories 作为getLogger方法的键名对应
            categories: {
                //appenders:采用的appender,取上面appenders项,level:设置级别
                http: { appenders: [out, httpLog], level: "debug" },
                default: { appenders: [out, allLog, error], level: debug }, //error写入时是经过筛选后留下的
            }
        
        });
        
        //getLogger参数取categories项,为空或者其他值取default默认项
        // exports.getLogger = function (name) {
        //     return log4js.getLogger(name || ‘default‘)
        // }
        const logger = log4js.getLogger("liveMeeting");
        
        const httpLog = log4js.getLogger(http);
        const httpLogger = log4js.connectLogger(httpLog, { level: WARN });
        
        exports = module.exports = { logger, httpLogger };

        http请求日志 http请求日志需要app.use引用一下, 这样才会自动记录每次的请求信息 :
        global.logger = require(./config/log4js).logger;
        httpLogger = require(./config/log4js).httpLogger;
        
        //这样会自动记录每次请求信息,放在其他use上面
        app.use(httpLogger);

        logger用来记录所有手动输入的日志,如:

        logger.info(‘test info‘);
        logger.error(‘test error info ‘);
         
        httpLogger用来记录每次请求日志;
         
        参数参考文章: 文章1
                                  文章2
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