JavaScript on Commentary of Takao

React 19 新功能：開發人員需要了解的內容

Wed, 08 Jul 2026 10:00:00 +0900

React 19 發生了什麼變化

React 19 不是一個小更新，而是一個範式轉移。穩定的伺服器元件、新的鉤子和 React 編譯器從根本上改變了開發人員編寫應用程式的方式。

穩定的伺服器元件

React 伺服器元件 (RSC) 現已投入生產。透過在伺服器上渲染並將 HTML 發送到客戶端，它們可以顯著減小包的大小。

Replacing 地方Storage: Dynamic IndexedDB wrapper localForage

Fri, 20 Feb 2026 00:00:00 +0900

Introduction

Client-side storage is a fundamental requirement for modern web applications — offline caches, user preferences, draft data, and session state all need to persist in the browser. For years, localStorage has been the simplest go-to solution, but its limitations become painful as applications grow. This article compares localStorage, raw IndexedDB, and the localForage wrapper library, providing practical guidance for choosing the right storage engine.

The Limits of localStorage

localStorage offers a straightforward synchronous key-value API — setItem(key, value) and getItem(key) — but it comes with hard constraints:

使用 v 標誌解鎖 JavaScript RegExp 功能

Wed, 15 Oct 2025 00:00:00 +0900

介紹

JavaScript 中的正規表示式已經有了顯著的發展。 ES2024 引入了 v 標誌 — u 標誌的超集，可解鎖強大的集合表示法、字符類減法、交集和正確的 Unicode 表情符號匹配。如果您一直在努力應對複雜的字元類邏輯或表情符號正規表示式模式，那麼 v 標誌將改變遊戲規則。

設計乾淨的 React 自訂 Hook 以實現可重複使用性

Sun, 10 Aug 2025 00:00:00 +0900

介紹

當您開發 React 元件時，您可能會發現檔案成長到數百行。當 useState、useEffect、API 查詢和驗證邏輯與渲染標記混合時，就會發生這種情況，使元件難以讀取和維護。

Node.js 中的 ESM 與 CommonJS 互通挑戰

Fri, 25 Jul 2025 00:00:00 +0900

介紹

Node.js 自 v12 起就支援 ECMAScript 模組 (ESM)，但生態系仍深植於 CommonJS (CJS)。將兩個模組系統混合在一個專案中——或從 ESM 程式碼中使用 CJS 套件——會引入圍繞導出、預設導入和全局的微妙陷阱。本文繪製了互通邊界並提供了平滑遷移的具體策略。

使用 requestIdleCallback 執行非阻塞腳本

Fri, 25 Jul 2025 00:00:00 +0900

介紹

在建立複雜的 Web 應用程式時，保持流暢的動畫和響應式使用者輸入（理想情況下匹配 60+ FPS 幀速率）對於良好的使用者體驗至關重要。

然而，現代應用程式通常需要執行低優先順序的後台操作，例如發送分析資料、同步快取、解析遙測日誌或預取資產。

ECMAScript 2025 (ES16) 中令人興奮的功能

Thu, 15 May 2025 00:00:00 +0900

介紹

每年，TC39 委員會都會更新 ECMAScript 規範，為 JavaScript 生態系引進新的語言功能和 API。

對於即將推出的 ECMAScript 2025 (ES16) 標準，一些提案已達到第 3 階段或第 4 階段，表明它們正處於瀏覽器實施和採用的最後階段。

React 19 Official Release and Practical Features 指南

Wed, 05 Mar 2025 00:00:00 +0900

Introduction

React 19 represents a major paradigm shift for frontend development.

Features that were previously restricted to meta-frameworks like Next.js—such as React Server Components (RSC) and the Actions API for form handling—are now officially integrated into the stable core React library.

This guide highlights the most important features in React 19, offering practical code examples and upgrading tips to clean up your codebase.

JavaScript 非同步/等待應避免的模式

Sat, 15 Feb 2025 00:00:00 +0900

介紹

自從 ES2017 中引入 async/await 以來，編寫非同步 JavaScript 變得更加直觀。它允許開發人員以看起來同步的結構表達非同步邏輯，與嵌套的 Promise 鏈 (.then().catch()) 相比，大大提高了程式碼庫的可讀性。

File System Access API: Powerful 地方 File Operations

Sat, 28 Dec 2024 00:00:00 +0900

Introduction

For decades, web applications were limited to reading files through a clunky <input type="file"> element and had no reliable way to save changes back to the original file. The File System Access API changes this entirely. It enables web applications to read, write, and manage files and directories directly on the user’s 本地 file system — with user permission, of course. This opens the door to building text editors, image editors, IDEs, and productivity tools that feel native.

JavaScript Array Methods: From 基礎 to 進階 Patterns

Thu, 12 Dec 2024 00:00:00 +0900

JavaScript arrays are the backbone of data manipulation in modern web development. With the ES2023 specification introducing immutable alternatives to long-standing mutating methods, now is the perfect time to revisit how we work with arrays. This article covers the full landscape of array methods, from the familiar map, filter, and reduce to cutting-edge additions, with practical examples and performance insights.

The Array Method Landscape

Array methods 秋季 into two broad categories: mutating and non-mutating. Methods like push, pop, splice, sort, and reverse modify the array in place, while map, filter, slice, and the ES2023 additions create new arrays. The industry trend is shifting toward immutability, which reduces bugs caused by unintended side effects.

JavaScript 類型數組：瀏覽器中的二進位資料處理

Tue, 10 Sep 2024 00:00:00 +0900

JavaScript 的原生 Number 類型（IEEE 754 雙精度浮點數）對於二進位資料來說效率低。早期的解決方案涉及在普通數組中手動打包字節，這種方法速度慢且容易出錯。 ECMAScript 2015 正式化了型別數組，為 JavaScript 帶來了類似 C 的記憶體管理。這種三層架構 — ArrayBuffer、TypedArray 視圖和 DataView — 支援在瀏覽器和 Node.js 中進行高效能二進位資料處理。

JavaScript 模組聯盟：微前端實踐

Tue, 09 Jul 2024 00:00:00 +0900

介紹

Webpack 5 中引入的模組聯合提供了用於建構微前端架構的運行時整合機制。與建置時整合方法不同，它使獨立部署的應用程式能夠在運行時共享程式碼，從而促進團隊自治和增量遷移，而無需協調發布。

JavaScript 代理程式與 Reflect API：元程式模式

Tue, 04 Jun 2024 00:00:00 +0900

JavaScript 的 Proxy 和 Reflect API 是該語言中最強大的元程式設計工具之一。它們允許開發人員攔截和自訂物件的基本操作——屬性存取、賦值、枚舉、函數調用，甚至建構函數調用。本文探討了所有 13 個代理陷阱、互補的 Reflect API 以及 Vue 3、MobX 和 Immer 等生產框架中使用的真實模式。

WebSocket for Real-Time 使用法s: Complete 指南

Tue, 14 May 2024 00:00:00 +0900

Real-time functionality has become a baseline expectation for modern web applications. WebSocket provides full-duplex communication channels over a single TCP connection, enabling low-latency data exchange between client and server. This guide covers the WebSocket protocol, implementation patterns, scaling strategies, and practical considerations for building production-grade real-time applications.

WebSocket Protocol Overview

WebSocket begins with an HTTP upgrade handshake. The client sends an HTTP request with an Upgrade: websocket header, and the server responds with 101 Switching Protocols to establish the connection. Once established, the connection transitions from HTTP to the WebSocket protocol on the same underlying TCP socket.

Node.js 工作執行緒：平行處理實踐

Tue, 23 Apr 2024 00:00:00 +0900

Node.js 傳統上是單線程的，並依賴非同步 I/O 來實現並發。雖然此模型擅長處理 I/O 密集型工作負載，但 CPU 密集型操作會阻止事件循環並降低應用程式回應能力。在 Node.js 12 中穩定的工作執行緒透過在單獨的 V8 隔離中執行 JavaScript 來在單一進程中提供真正的平行執行。本文介紹了在生產中使用工作執行緒的實用模式。

ES2024 新功能：JavaScript 的新功能

Tue, 12 Mar 2024 00:00:00 +0900

ECMAScript 2024 (ES15) 為 JavaScript 引進了幾個期待已久的功能。本文透過實際範例和採用時間表指南介紹了新功能。

陣列分組：Object.groupBy 和 Map.groupBy

最受歡迎的 JavaScript 功能之一終於到來了。 Object.groupBy 和 Map.groupBy 根據回呼將陣列元素分割為群組：

ESLint Flat Config: 移居指南 from Legacy .eslintrc

Mon, 26 Feb 2024 00:00:00 +0900

ESLint v9.0, released in 2024, made the flat config system (eslint.config.js) the default, replacing the legacy .eslintrc format that had been in use for over a decade. This migration guide covers the complete transition process, new concepts, and practical examples.

Why Flat Config?

The legacy .eslintrc system had several problems: configuration cascading made behavior unpredictable, directory-based resolution was complex, JSON/YAML lacked 支援 for functions and comments, and shareable configs were difficult to compose. Flat config addresses these with a single configuration file, explicit composition via JavaScript arrays, simplified plugin resolution, and full JavaScript-native syntax.

JavaScript 事件循環深入探討：微任務、巨集任務及其他

Mon, 19 Feb 2024 00:00:00 +0900

JavaScript 事件循環是該語言中最重要但又被誤解的概念之一。儘管 JavaScript 是單線程的，但它的事件循環通過複雜的隊列系統實現了非阻塞並發。本文建構了 JavaScript 如何處理非同步執行的完整心智模型，從呼叫堆疊到微任務佇列以及其間的所有內容。

Vite外掛開發：從零到量產

Mon, 05 Feb 2024 00:00:00 +0900

Vite 的插件系統是其最強大的功能之一，可讓開發人員擴展和自訂建置管道。無論您需要轉換文件類型、注入建置時常數或與其他工具集成，Vite 外掛程式 API 都可以讓您完全掌控。

Node.js Streams: Practical 指南 for Data Processing

Wed, 20 Dec 2023 00:00:00 +0900

Node.js streams are one of the most powerful yet underutilized features of the platform. They enable processing data piece by piece as it arrives, rather than loading entire datasets into memory. This makes them essential for working with large files, network communication, and real-time data transformation. This guide covers stream fundamentals and practical patterns for building robust data pipelines.

Understanding Stream Types

Node.js provides four fundamental stream types, each serving a distinct role in data processing pipelines.

進階 JavaScript Promise Patterns: Async Control 流程 Mastery

Tue, 05 Dec 2023 00:00:00 +0900

Promises are fundamental to modern JavaScript, but mastering asynchronous control flow requires going beyond basic .then() chains. This article explores advanced Promise patterns that intermediate to senior developers need for production applications, from concurrency control to error handling and cancellation.

The Promise Landscape Beyond Basics

JavaScript provides four static methods on Promise for composing async operations, each suited to different scenarios:

Method	Resolves When	Rejects When	Use Case
`Promise.all`	All promises resolve	Any promise rejects	Parallel API calls, all required
`Promise.allSettled`	All promises settle	Never	Mixed results, log all outcomes
`Promise.race`	First promise settles	First promise rejects	Timeout race conditions
`Promise.any`	First promise resolves	All promises reject	First-successful-response pattern

const results = await Promise.allSettled([
 fetch("/api/users").then(r => r.json()),
 fetch("/api/posts").then(r => r.json()),
 fetch("/api/comments").then(r => r.json()),
]);
const successful = results.filter(r => r.status === "fulfilled").map(r => r.value);

Promise.allSettled is particularly useful when you need to process partial results even if some operations fail, such as batch data synchronization where individual record failures should not abort the entire batch.

JavaScript on Commentary of Takao

React 19 新功能：開發人員需要了解的內容

React 19 發生了什麼變化

穩定的伺服器元件

Replacing 地方Storage: Dynamic IndexedDB wrapper localForage

Introduction

The Limits of localStorage

使用 v 標誌解鎖 JavaScript RegExp 功能

介紹

設計乾淨的 React 自訂 Hook 以實現可重複使用性

介紹

Node.js 中的 ESM 與 CommonJS 互通挑戰

介紹

使用 requestIdleCallback 執行非阻塞腳本

介紹

ECMAScript 2025 (ES16) 中令人興奮的功能

介紹

React 19 Official Release and Practical Features 指南

Introduction

JavaScript 非同步/等待應避免的模式

介紹

File System Access API: Powerful 地方 File Operations

Introduction

JavaScript Array Methods: From 基礎 to 進階 Patterns

The Array Method Landscape

JavaScript 類型數組：瀏覽器中的二進位資料處理

JavaScript 模組聯盟：微前端實踐

介紹

JavaScript 代理程式與 Reflect API：元程式模式

WebSocket for Real-Time 使用法s: Complete 指南

WebSocket Protocol Overview

Node.js 工作執行緒：平行處理實踐

ES2024 新功能：JavaScript 的新功能

陣列分組：Object.groupBy 和 Map.groupBy

ESLint Flat Config: 移居 指南 from Legacy .eslintrc

Why Flat Config?

JavaScript 事件循環深入探討：微任務、巨集任務及其他

Vite外掛開發：從零到量產

Node.js Streams: Practical 指南 for Data Processing

Understanding Stream Types

進階 JavaScript Promise Patterns: Async Control 流程 Mastery

The Promise Landscape Beyond Basics

ESLint Flat Config: 移居指南 from Legacy .eslintrc