node.js express使用log4js記錄日誌__js

建立log.js

var log4js = require('log4js');log4js.configure({    appenders: [        {            type: 'console',            category: "console"        }, //控制台輸出        {            type: "dateFile",            filename: 'logs/log.log',            pattern: "_yyyy-MM-dd",            alwaysIncludePattern: false,            category: 'dateFileLog'        }//日期檔案格式    ],    replaceConsole: true,   //替換console.log    levels:{        dateFileLog: 'INFO'    }});var dateFileLog = log4js.getLogger('dateFileLog');exports.logger = dateFileLog;exports.use = function(app) {    //頁面請求日誌,用auto的話,預設層級是WARN    //app.use(log4js.connectLogger(dateFileLog, {level:'auto', format:':method :url'}));    app.use(log4js.connectLogger(dateFileLog, {level:'debug', format:':method :url'}));}

在app.js中添加以下代碼，由於載入順序的原因，放在其他app.use前面

var log = require('./log');log.use(app);

功能中記錄日誌，require路徑根據自己項目修改：

var logger = require('../log').logger;logger.info("this is log");

需要注意的是，如果日誌使用的是日期（如本例子），即一天一個檔案，測試的話，直接修改日期測試，是不會生產新的日期日誌的，必須把時間調為晚上23點59分，然後等著過整點，這時候可以測試是否會產生新的檔案，官方例子說明如下（ https://github.com/nomiddlename/log4js-node/wiki/Date%20rolling%20file%20appender）：

Then initial logging would create a file called "blah.log".At midnight, the current "blah.log" file would be renamed to "blah.log-2012-09-26" (for example), and a new "blah.log" file created.