qq_43000621的博客

import 'dart:io'; import 'package:flutter/material.dart'; class ScrollBarDemo extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('ScrollBarDemo'), elevation:

1、四边边框 decoration: BoxDecoration( border: Border.all( color: Color(0xaaff0000), width: 3.0, style: BorderStyle.solid ) ), 2、单边边框 decoration: BoxDecoration( border: Border( bottom: BottomSide( color: Color(0xaaff0000), wi