我的代码是:
log4js.loadAppender('file');
log4js.addAppender(log4js.appenders.file('logs/cheese.log'), 'cheese');
logger.setLevel('DEBUG');
logger.trace('Entering cheese testing');
logger.debug('Got cheese.');
logger.info('Cheese is Gouda.');
logger.warn('Cheese is quite smelly.');
logger.error('Cheese is too ripe!');
logger.fatal('Cheese was breeding ground for listeria.');
它正在创建一个名为'cheese'的文件,但其中没有任何内容.如何写内容呢？