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WSL2 Docker释放磁盘空间

Docker使用久了，会残留很多中间生成的镜像，占用磁盘空间。

要清理Docker镜像，本来是挺简单的，一条命令就搞定了：

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void main() {
  print(DateTime.parse('2020-08-21T07:20:15-08:00'));
}

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BlocProvider(
  create: (context) => CounterCubit(),
  child: CounterPage(),
);

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BlocBuilder<CounterCubit, int>(
  builder: (context, count) {
    return Center(
      child: Text('$count'),
    );
  },
);

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import 'dart:async';
import 'dart:isolate';

import 'package:flutter/foundation.dart';

Isolate isolate;

start() async {
  ReceivePort receivePort = ReceivePort(); // 接收訊息的 port
  isolate = await Isolate.spawn(

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import 'dart:io'; // for exit();
import 'dart:async';
import 'dart:isolate';

Future<SendPort> initIsolate() async {
  Completer completer = new Completer<SendPort>();
  ReceivePort isolateToMainStream = ReceivePort();

  isolateToMainStream.listen((data) {
    if (data is SendPort) {

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import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override

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import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override

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void main() {
  perform();
}

void perform() async {
  t1();
  String b2 = await t2();
  t3(b2);
}

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import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';
import 'package:html_flutter/const.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {