1、toast，设置显示时间

lib/utils/toast_util.dart

@@ -4,13 +4,13 @@ import 'package:fluttertoast/fluttertoast.dart';
 
 class ToastUtil {
   static void showToast(String? txt,
-      {ToastDuration toastLength = ToastDuration.short}) {
+      {ToastDuration toastDuration = ToastDuration.short}) {
     if (txt.isNullOrEmpty()) {
       txt = "信息异常";
     }
     Fluttertoast.showToast(
         msg: txt ?? "",
-        toastLength: toastLength == ToastDuration.long
+        toastLength: toastDuration == ToastDuration.long
             ? Toast.LENGTH_LONG
             : Toast.LENGTH_SHORT,
         gravity: ToastGravity.BOTTOM,