增加城市/ISP查询接口

internal/db/models/regions/region_city_model_ext.go

@@ -1 +1,18 @@
 package regions
+
+import (
+	"encoding/json"
+	"github.com/iwind/TeaGo/logs"
+)
+
+func (this *RegionCity) DecodeCodes() []string {
+	if len(this.Codes) == 0 {
+		return []string{}
+	}
+	result := []string{}
+	err := json.Unmarshal([]byte(this.Codes), &result)
+	if err != nil {
+		logs.Error(err)
+	}
+	return result
+}