1、toast，设置显示时间

lib/utils/toast_util.dart

@@ -3,13 +3,13 @@ import 'package:flutter_clx_base/common/extension.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 
 class ToastUtil {
-  static void showToast(String? txt) {
+  static void showToast(String? txt,{Toast toastLength = Toast.LENGTH_SHORT}) {
     if(txt.isNullOrEmpty()){
       txt = "信息异常";
     }
     Fluttertoast.showToast(
         msg: txt ?? "",
-        toastLength: Toast.LENGTH_SHORT,
+        toastLength: toastLength,
         gravity: ToastGravity.BOTTOM,
         // timeInSecForIos: 1,
         backgroundColor: Colors.grey,