WecTeam (维C团) is the front‑end technology team of JD.com’s Jingxi business unit, focusing on front‑end engineering, web performance optimization, mini‑program and app development, serverless, multi‑platform reuse, and visual building.
This tutorial explains how to implement common image filters such as red, grayscale, and inverse effects using the Canvas API, then introduces convolution fundamentals to achieve advanced effects like edge detection and sharpening, complete with code samples and visual results.
This article explains how JD’s self‑built Mart Page Maker (MPM) enables large‑scale e‑commerce teams to create complex marketplace pages instantly without coding, by leveraging rich component templates, a three‑layer configuration model, unified data sources, and a high‑performance Node rendering layer.
This tutorial walks through creating a lightweight web Gomoku game using JavaScript, detailing both a plain‑DOM renderer and a Canvas renderer, their interchangeable architecture, and core features like move handling, undo/redo, win detection, and board resetting.
Learn how to write comprehensive tests for Vue applications—including unit, integration, and end-to-end tests—using Vue CLI, Mocha, Chai, Vue Test Utils, Vuex, Vue Router, Sinon, and Cypress, with practical code examples that demonstrate test setup, mocking, and browser verification.
This article explains why WeChat Mini Programs need a custom cookie solution, details the browser cookie model, and provides a step‑by‑step implementation using the Mini Program Storage and Network APIs, including code samples, performance tips, testing, and security considerations.
This article chronicles a developer's transition from plain JavaScript to TypeScript, illustrating how static typing improves code robustness, debugging, and documentation while also discussing migration steps, common pitfalls, and practical examples across frontend projects.
This article walks through creating a JSON parser in JavaScript, covering the JSON grammar, railroad and BNF diagrams, step‑by‑step implementation of object, array and value parsing, robust error handling, and suggestions for meaningful error messages.
This tutorial explains how to bring TypeScript‑style type checking and autocomplete into regular JavaScript files using VSCode, JSDoc comments, and declaration files, allowing developers to enjoy static‑type benefits without converting the whole project to .ts files.
This article shares practical experiences and techniques for migrating a medium‑size Koa2 project to TypeScript with Midway, covering tsconfig settings, the dangers of any, strategies using unknown, strict compiler options, type guards, assertion functions, and how to construct a concise, reusable type system for backend models.
By combining server‑side rendering, critical‑render‑path tuning, resource minification, image format upgrades, and RAIL‑based multi‑dimensional monitoring, JD dramatically reduced its WeChat shopping homepage’s first‑screen load time, offering a practical roadmap for front‑end performance optimization.
