Node.js

Node's package management and loading mechanisms: npm search xxx, npm view xxx, npm install xxx. Node.js file system operation APIs: Node.js's `fs` module provides synchronous (Sync) and callback/Promise-based asynchronous APIs for operating on local files and directories. Commonly used capabilities in daily development include reading, writing, appending, deleting, traversing directories, listening for changes, and so on. The following examples are based on C...

WebSocket and SSE Overview WebSocket Basics Definition: WebSocket is a full-duplex connection upgraded after an HTTP handshake, allowing clients and servers to push data bidirectionally over the same TCP channel, eliminating the need for repeated polling. Handshake Process: The client initiates an HTTP request with the Upgrade: websocket header; The server responds with 101 Switching Protocols, and both parties agree...

Node.js: Understanding it from an Asynchronous Programming Paradigm
Node.js's Positioning and Core Philosophy
Based on the V8 engine + libuv event-driven library, it brings JavaScript from the browser to the server side. It uses a single-threaded event loop to handle I/O, maximizing CPU time slices while waiting for I/O, making it particularly suitable for high-concurrency, I/O-intensive scenarios. "Don't block the main thread" is its design philosophy: try to offload time-consuming operations to the kernel or a thread pool, and callback results...