Course Introduction：How to implement client-side verification of uploaded file size in html5. How to implement client-side verification of the size of uploaded files in html5? In HTML 5, file uploading can now be verified on the client side. For example, after the user selects a file, it can be verified immediately.
2016-07-12 comment 0 954
Course Introduction：This article explains the HTML5 WebSockets API for real-time, bidirectional client-server communication. It details client-side (JavaScript) and server-side (Python/Flask) implementations, addressing challenges like scalability, state management, an
2025-03-12 comment 0 987
Course Introduction：WebSocket is a full-duplex communication protocol provided by HTML5, suitable for real-time interactive scenarios. 1. The client establishes a connection through newWebSocket(url) and listens to events such as onopen and onmessage, and uses send() to send data; 2. The server can be built with Node.js' WS library to listen to connections and message events and handle them; 3. When using it, pay attention to cross-domain issues, connection maintenance, message format uniformity and security. It is recommended that the client implement an automatic reconnection mechanism. Mastering these key points can build powerful real-time communication applications.
2025-07-04 comment 0 779
Course Introduction：HTML5's localStorage and sessionStorage enable client-side data storage, differing in scope and persistence. Key issues include security risks and effective data management.
2025-03-18 comment 0 347
Course Introduction：The article discusses using IndexedDB for client-side storage in HTML5, covering setup, data operations, and benefits like offline functionality and high storage capacity. It also addresses data persistence, security, and common implementation pitfal
2025-03-14 comment 0 733
Course Elementary 13747
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82260
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13131
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24578
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27436
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
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