update ddns-aliyun

ddns-aliyun/utils.go

@@ -16,6 +16,15 @@ var funcs = map[string]interface{}{
 	"reslove": cip.ResloveIPv4,
 }
 
+func contains(slice []string, item string) bool {
+	set := make(map[string]struct{}, len(slice))
+	for _, s := range slice {
+		set[s] = struct{}{}
+	}
+	_, ok := set[item]
+	return ok
+}
+
 func ip2locCN(ip string) (str string) {
 	if strings.Count(ip, `.`) < 3 {
 		return