前言

• 实现进程层面文件日志的写入

封装的log4js日志类

function Logger(tag, alias) {
  const log4js = require("log4js");
  tag = tag || "cheese";
  const tagE = tag + ".";
  const config = {
    appenders: {}, 
    categories: {
      default: {
        appenders: [], //存放的位置
        level: "trace" //级别
      }
    }
  };
  config.appenders[tagE] = {
    type: "console",
    level: "trace"
  };
  config.appenders[tag] = {
    type: "file",
    filename: alias ? `./logs/${alias}.log` :'./logs/ser.log',
    maxLogSize: parseInt(5 * 1024 * 1024, 10),
    backups: 2,
    level: "info"
  };
  config.categories.default.appenders.push(tag);
  config.categories.default.appenders.push(tagE);
  log4js.configure(config);
  return log4js.getLogger(tag);
}

module.exports = function (tag, alias) {
  return new Logger(tag, alias);
};

示例demo

const logger = require(''./log.js)(tagName,fileName)