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    1. 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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