log4js的配置文件

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log4js有1.x和2.x不同版本，网络上搜到的很多文章介绍的配置文件格式都是1.x的，主要表现在appenders配置是一个数组，而2.x配置是一个对象，下面是一个2.x的配置文件示例。

{"appenders":{"console":{"type":"console"},"everything":{"type":"DateFile","filename":"./log/everything","pattern": "-yyyy-MM-dd.log","alwaysIncludePattern": true,"layout":{"type":"pattern", "pattern":"[%d{yyyy-MM-dd hh:mm:ss} %5.5p] %m"}},"db":{"type":"DateFile","filename":"./log/db","pattern": "-yyyy-MM-dd.log","alwaysIncludePattern": true,"layout":{"type":"pattern", "pattern":"[%d{yyyy-MM-dd hh:mm:ss} %5.5p] %m"}},"api":{"type":"DateFile","filename":"./log/api","pattern": "-yyyy-MM-dd.log","alwaysIncludePattern": true,"layout":{"type":"pattern", "pattern":"[%d{yyyy-MM-dd hh:mm:ss} %5.5p] %m"}}},"categories":{"default":{"appenders":["console"],"level":"all"},"everything":{"appenders":["console", "everything"],"level":"info"},"db":{"appenders":["console", "everything", "db"],"level":"info"},"api":{"appenders":["console", "everything", "api"],"level":"trace"}}}

简单的说，appenders配置是一个对象，对象的每一个k/v键值对都是一个appender，名称是key，value是具体的配置信息。categories指明了实例化logger对象时使用的具体配置，如以api为名的logger示例，将会接受trace以上的日志信息，并向console、everything、api三个appender中同时输出。

具体配置参见官网文档。

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