错误日志只保存7天

@@ -51,7 +51,8 @@ module.exports = {
             name: 'error',
             name: 'error',
             level: 'error',
             level: 'error',
             filename: 'logs/error.log',
             filename: 'logs/error.log',
-            handleExceptions: true
+            handleExceptions: true,
+            maxFiles: 7
         },
         },
         udp: { // send by udp
         udp: { // send by udp
             level: 'debug', // logger level
             level: 'debug', // logger level