func Debug(v ...interface{}) {
	defaultLogger.logf(LevelDebug, nil, v...)
}
Debug calls the default logger's Debug method.
package klog
import (
	"fmt"
	"io"
	"log"
	"os"
)
var (
	_ Logger       = (*localLogger)(nil)
	_ FormatLogger = (*localLogger)(nil)
)
func SetOutput(w io.Writer) {
	defaultLogger.logger.SetOutput(w)
}
func DefaultLogger() FormatLogger {
	return defaultLogger
}
func Fatal(v ...interface{}) {
	defaultLogger.logf(LevelFatal, nil, v...)
}
func Error(v ...interface{}) {
	defaultLogger.logf(LevelError, nil, v...)
}
func Warn(v ...interface{}) {
	defaultLogger.logf(LevelWarn, nil, v...)
}
func Notice(v ...interface{}) {
	defaultLogger.logf(LevelNotice, nil, v...)
}
func Info(v ...interface{}) {
	defaultLogger.logf(LevelInfo, nil, v...)
}