Kerwen Blog

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File read write in web

Reference How to read and save files in JavaScript starting with Chrome 86 showDirectoryPicker showOpenFilePicker showSaveFilePicker Angular File Upload: Complete Guide Save and upload file...

Posted by Kerwen Blog on March 6, 2025

Typescript + express

创建一个express工程 1 2 3 mkdir server cd server npm init 安装必要的依赖 1 npm install express typescript ts-node @types/node @types/express --save-dev Express：适用于 Node.js 的极简且灵活的 Web 应用程序框架。 TypeScr...

Posted by Kerwen Blog on March 4, 2025

Define JSON type in Typescript

Reference How to create a type for complex JSON object in TypeScript? https://stackoverflow.com/a/65121152/7352168

Posted by Kerwen Blog on February 21, 2025

Using async/await in Express.js

Reference Using async/await in Express.js

Posted by Kerwen Blog on February 18, 2025

await Promise all vs multiple await

Reference Any difference between await Promise.all() and multiple await? Explain Promise.all with async-await in JavaScript

Posted by Kerwen Blog on February 13, 2025

1 2 3 4 5 6 7 function bad() { return new Promise(function(resolve) { getOtherPromise().then(function(result) { resolve(result.property.example); }); }) } If t...

Posted by Kerwen Blog on August 28, 2025

JavaScript异步编程

异步编程是一种编程方式，它允许程序在等待某些操作完成的同时，继续执行其他任务。这种编程方式可以显著提高程序的执行效率，特别是在处理 I/O 密集型任务（如网络请求、文件读写等）时表现出色。在 JavaScript 中，异步编程的实现主要依赖于事件循环（Event Loop）、回调函数（Callback Functions）、Promise 对象以及 async/await 语法糖等机制。...

Posted by Kerwen Blog on January 15, 2025

xsd

XML Schema 描述XML文档的结构。 XML模式的目的是定义XML文档的合法构建块: 可以出现在文档中的元素和属性子元素的数量（和顺序）元素和属性的数据类型元素和属性的默认值和固定值下面是一个名为”note.xml”的简单XML文档: 1 2 3 4 5 6 7 <?xml version="1.0"?> <note> ...

Posted by Kerwen Blog on December 26, 2024

Use pkg to package 32 bit node project and enable /SafeSEH

PKG Build Process pkg has so called “base binaries” - they are actually same node executables but with some patches applied. They are used as a base for every executable pkg creates. pkg downloads...

Posted by Kerwen Blog on December 11, 2024

Dynamic import ESModules in CommonJS

今天在升级第三方module到最新,升完就发现问题了。我们的project用的是CommonJs，但一些第三方的module最新版本用了ESModule。比如del。 del 6.0还是用的CommonJs，之前的调用是这么写的： 1 2 del = require('del') del('path') 从7.0开始，del开始用ESModule。官方例子变成了这样 1 2 impo...

Posted by Kerwen Blog on November 26, 2024