The Xueersi Online School Tech Team, dedicated to innovating and promoting internet education technology.
This article introduces GDI and DXGI screen‑capture techniques, shows how to implement them in Qt with complete code examples, compares their performance and visual results, and discusses practical considerations for teacher‑side applications such as multi‑screen and live‑streaming environments.
This article explains how to unify error handling between gRPC and traditional HTTP services by defining shared protobuf messages, mapping gRPC status codes to HTTP responses, and customizing response structures with additional fields like stat and msg for consistent business‑level error reporting.
This article explains the design, mathematical foundation, and performance‑oriented optimization of a lasso tool that enables batch selection, rotation, scaling, and translation of graphics on an HTML Canvas‑based online whiteboard, including matrix‑based transformation, state recording, undo/redo, and experimental results.
This article details the design, architecture, key technologies, and deployment of Xiaosi, an AI‑powered intelligent customer service chatbot built on the internal IM platform, highlighting its problem‑diagnosis accuracy, manpower savings, adapter mechanism, high‑availability backend, and practical use cases.
This article details the background, analysis, and step‑by‑step solutions for reducing package size, improving cold‑start time, and establishing a comprehensive mobile performance testing framework for both Android and iOS versions of the Xueersi Online School app.
The article introduces xeasy-ml, a Python machine‑learning framework, explains its installation requirements, demonstrates how to initialize a project, run training, view result artifacts, and provides detailed instructions for online prediction using configuration files and code examples.
The article explains the concept of white‑screen time, its impact on user experience, and presents multiple detection methods—including Navigation Timing API, MutationObserver, element‑point analysis, and headless‑browser simulation—along with implementation code and a monitoring‑alert architecture for front‑end performance optimization.
This article introduces the ZRender canvas rendering engine, explains its underlying Canvas2D API, demonstrates how to integrate ZRender into projects, and provides detailed code examples for creating shapes, handling events, adding animations, and extending the library with custom elements such as video support.
The article explains how the V8 engine parses source code into an AST, compiles it to bytecode and optimized machine code, describes JavaScript execution concepts such as scopes, call stacks, and the event loop, and provides practical performance‑tuning tips with code examples.
This article explains how Go's garbage collection has progressed from the simple stop‑the‑world mark‑and‑sweep algorithm in Go 1.3, through the tri‑color concurrent marking with insert and delete write barriers in Go 1.5, to the hybrid write‑barrier approach introduced in Go 1.8 that dramatically reduces pause times while preserving memory safety.
