fix default logger

xlog/logger.go

@@ -22,7 +22,8 @@ func New(w io.Writer) *Logger {
 
 // DefaultLogger defult logger
 func DefaultLogger(w io.Writer) *Logger {
-	return New(w)
+	defLog = New(w)
+	return defLog
 }
 
 // Writer returns the output destination for the standard logger.