将 log4js 移植到 Node.js
This is a conversion of the log4js framework to work with node. I started out just stripping out the browser-specific code and tidying up some of the javascript to work better in node. It grew from there. Although it's got a similar name to the Java library log4j, thinking that it will behave the same way will only bring you sorrow and confusion.
The full documentation is available here.
There have been a few changes between log4js 1.x and 2.x (and 0.x too). You should probably read this migration guide if things aren't working.
Out of the box it supports the following features:
Optional appenders are available:
npm install log4js
Minimalist version:
var log4js = require("log4js");
var logger = log4js.getLogger();
logger.level = "debug";
logger.debug("Some debug messages");
By default, log4js will not output any logs (so that it can safely be used in libraries). The level for the default category is set to OFF. To enable logs, set the level (as in the example). This will then output to stdout with the coloured layout (thanks to masylum), so for the above you would see:
[2010-01-17 11:43:37.987] [DEBUG] [default] - Some debug messages
See example.js for a full example, but here's a snippet (also in examples/fromreadme.js):
const log4js = require("log4js");
log4js.configure({
appenders: { cheese: { type: "file", filename: "cheese.log" } },
categories: { default: { appenders: ["cheese"], level: "error" } },
});
const logger = log4js.getLogger("cheese");
logger.trace("Entering cheese testing");
logger.debug("Got cheese.");
logger.info("Cheese is Comté.");
logger.warn("Cheese is quite smelly.");
logger.error("Cheese is too ripe!");
logger.fatal("Cheese was breeding ground for listeria.");
Output (in cheese.log):
[2010-01-17 11:43:37.987] [ERROR] cheese - Cheese is too ripe!
[2010-01-17 11:43:37.990] [FATAL] cheese - Cheese was breeding ground for listeria.
If you're writing a library and would like to include support for log4js, without introducing a dependency headache for your users, take a look at log4js-api.
Available here.
There's also an example application.
import * as log4js from "log4js";
log4js.configure({
appenders: { cheese: { type: "file", filename: "cheese.log" } },
categories: { default: { appenders: ["cheese"], level: "error" } },
});
const logger = log4js.getLogger();
logger.level = "debug";
logger.debug("Some debug messages");
We're always looking for people to help out. Take a look at the rules before submitting a pull request.
The original log4js was distributed under the Apache 2.0 License, and so is this. I've tried to keep the original copyright and author credits in place, except in sections that I have rewritten extensively.
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