FLutter 配置
FLutter 配置
IPHONEOS_DEPLOYMENT_TARGET
Set MinimumOSVersion to 9.0 in ios/Flutter/AppFrameworkInfo.plist
Ensure that you uncomment platform :ios, ‘9.0’ in ios/Podfile
Ensure that ios/Podfile contains the following post install script:
post_install do |installer|
installer.pods_project.targets.each do |target|
flutter_ad...
Security AES
Security AES
Dart AES
import 'package:encrypt/encrypt.dart';
final aesKey = Key.fromUtf8('wWKK335SKLDFJ146');
final iv = IV.fromLength(16);
final encrypter = Encrypter(AES(aesKey, mode: AESMode.cbc, padding: 'PKCS7'));
final encrypted = encrypter.encrypt(content, iv: iv);
final decrypted = encrypter.decrypt(encrypted, iv: iv);
print(d...
编译原理
编译原理
阶段
1. 词法分析阶段
2. 语法分析阶段
3. 语义分析阶段
4. 中间代码生成阶段
5. 代码优化阶段
6. 目标代码生成阶段
7. 符号表管理
8. 出错处理
文法和有限自动机
0型文法
1型文法
2型文法
3型文法, 也叫正规式
自动机
FSA: Finite state automaton, 有限状态自动机
DFA: Deterministic Finite Automaton, 确定有限自动机, 但不同于不确定的有限自动机，DFA中不会有从同一状态出发的两条边标志有相同的符号
NFA: Non-deterministic Finite Automaton, 不确定有限自动机
状态为一个有向图
DFA的一个状态是NFA的一...
Node HTTP
Node HTTP
http: 为http协议的库
https: 为https协议的库
http2: 为http2协议的库
添加超时时间
options中:
timeout: 5000
request.on('timeout', () => {})
req.on('socket', function (socket) {
socket.setTimeout(myTimeout);
socket.on('timeout', function() {
req.abort();
});
});
setTimeout(req.abort.bind(req), 3000);
问题
Uncaught Exception: Error: sock...
Electron
Electron
npm install -g npm
npm install -g npm@6
"electronDownload":{
"mirror":"https://npm.taobao.org/mirrors/electron/"
},
源
npm config set registry https://npm.taobao.org/mirrors/node
npm config set disturl https://npm.taobao.org/mirrors/node
npm config set ELECTRON_MIRROR http://npm.taobao.org/mirrors/electron/
API使用
Webview
...
Regular Expression
Regular Expression
\b 单词边界, 单词就是\w组成的
Flag
i: With this flag the search is case-insensitive: no difference between A and a (see the example below).
g: With this flag the search looks for all matches, without it – only the first match is returned.
m: Multiline mode (covered in the chapter Multiline mode of anchors ^ $, flag “m”).
s: Enables “do...
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