Update console.go

使用json直接初始化系统变量，代码更简单，并且便于后期扩展

@@ -8,30 +8,26 @@ import (
 
 type ConsoleWriter struct {
 	lg    *log.Logger
-	level int
+	Level int `json:"level"`
 }
 
 func NewConsole() LoggerInterface {
 	cw := new(ConsoleWriter)
 	cw.lg = log.New(os.Stdout, "", log.Ldate|log.Ltime)
-	cw.level = LevelTrace
+	cw.Level = LevelTrace
 	return cw
 }
 
 func (c *ConsoleWriter) Init(jsonconfig string) error {
-	var m map[string]interface{}
-	err := json.Unmarshal([]byte(jsonconfig), &m)
+	err := json.Unmarshal([]byte(jsonconfig), c)
 	if err != nil {
 		return err
 	}
-	if lv, ok := m["level"]; ok {
-		c.level = int(lv.(float64))
-	}
 	return nil
 }
 
 func (c *ConsoleWriter) WriteMsg(msg string, level int) error {
-	if level < c.level {
+	if level < c.Level {
 		return nil
 	}
 	c.lg.Println(msg)