【node】log4js日志

官方文档

更多详细参数查看官方文档: https://log4js-node.github.io/log4js-node/

日志级别

级别 含义 适用场景
TRACE 追踪详细的运行信息 开发环境，调试代码
DEBUG 调试信息 开发环境，测试环境
INFO 状态信息或重要事件 生产环境，监控程序运行状态
WARN 警告信息，潜在问题 生产环境，提醒潜在问题
ERROR 错误信息，程序仍可运行 生产环境，记录需要关注的错误
FATAL 致命错误，程序可能无法运行 生产环境，记录致命错误
MARK 标记或特殊事件 根据需求使用

常用配置代码

@/utils/logger.js

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import path from "node:path";
import log4js from "log4js";

log4js.configure({
  appenders: {
    // 标准输出流
    out: { type: "stdout" },
    // 日期文件输出
    dateFile: {
      type: "dateFile",
      filename: path.resolve(import.meta.dirname, "../", "logs", "dateFile", "log-name.log"),
      pattern: "yyyy-MM-dd_hh-mm-ss",
      alwaysIncludePattern: true,
      fileNameSep: ".",
      keepFileExt: true,
      encoding: "utf-8",
      maxLogSize: "10M",
      numBackups: 5,
      mode: 0o666,
      layout: {
        type: "basic",
      },
    },
    // 文件输出
    file: {
      type: "file",
      filename: path.resolve(import.meta.dirname, "../", "logs", "file", "log-name.log"),
      maxLogSize: "10M",
      backups: 5,
      encoding: "utf-8",
      mode: 0o666,
      keepFileExt: true,
      layout: {
        type: "basic",
      },
    },
    // 文件输出（同步）
    fileSync: {
      type: "fileSync",
      filename: path.resolve(import.meta.dirname, "../", "logs", "fileSync", "log-name.log"),
      maxLogSize: "10M",
      backups: 5,
      encoding: "utf-8",
      mode: 0o666,
      keepFileExt: true,
      layout: {
        type: "basic",
      },
    },
  },
  // 日志等级 level 值，等级由低到高，假设日志等级为 info，那么小于 info 的日志不会输出
  // ALL < TRACE < DEBUG < INFO < WARN < ERROR < FATAL < MARK < OFF
  categories: {
    default: { appenders: ["out"], level: "all" },
    app1: { appenders: ["dateFile"], level: "all" },
    app2: { appenders: ["file"], level: "all" },
    app3: { appenders: ["fileSync"], level: "all" },
  },
});

export const logger = log4js.getLogger("default");
export const loggerDateFile = log4js.getLogger("app1");
export const loggerFile = log4js.getLogger("app2");
export const loggerFileSync = log4js.getLogger("app3");

使用

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import { logger } from "@/utils/logger.js";

logger.trace("trace");
logger.debug("debug");
logger.info("info");
logger.warn("warn");
logger.error("error");
logger.fatal("fatal");
logger.mark("mark");