【Express】创建输出日志中间件（log4js）

const log4js = require('log4js')
//日志输出 控制台输出，文件也要输出
log4js.configure({
    appenders: {
        // 控制台输出
        out: {
            type: 'stdout',
            layout: {
                type: 'colored'
            }
        },
        //文件输出
        file: {
            filename: 'logs/server.log',
            type: 'file'
        }
    },
    categories: {
        default: {
            appenders: ['out', 'file'],
            level: 'debug'
        }
    }
})
const logger = log4js.getLogger('default')
const LoggerMiddleware = (req, res, next) => {
    logger.debug(`[${req.method}] -- ${req.url}`)
    next()
}

module.exports = LoggerMiddleware

const LoggerMiddleware = require('./middleware/logger.js')
app.use(LoggerMiddleware)