文档
- github: https://github.com/log4js-node/log4js-node
- doc https://log4js-node.github.io/log4js-node/
- npmjs https://www.npmjs.com/package/log4js
安装
node -v
v16.14.0
pnpm install log4js
package.json
{
"type": "module",
"dependencies": {
"log4js": "^6.6.1"
}
}
示例
import log4js from "log4js";
const logger = log4js.getLogger();
logger.level = "debug";
logger.debug("Some debug messages");
运行输出
$ node app.js
[2022-08-14T17:28:38.108] [DEBUG] default - Some debug messages
自定义配置,输出到文件
// log4js.config.js
export default {
appenders: {
output: {
type: "file",
filename: "logger.log",
maxLogSize: "1K", // K, M, G
backups: 3,
compress: false,
layout: {
type: "pattern",
pattern: "[%d{yyyy-MM-dd hh:mm:ss}] [%p] %f{1} line-%l: %m",
},
},
},
categories: {
default: {
appenders: ["output"],
level: "debug",
enableCallStack: true
},
},
};
// app.js
import log4js from "log4js";
import log4jsConfig from "./log4js.config.js";
// 配置
log4js.configure(log4jsConfig);
const logger = log4js.getLogger();
logger.debug("Some debug messages");
输出格式如下
[2022-08-14 18:14:08] [DEBUG] app.js line-18: Some debug messages