Web Workers là gì? Khi nào nên dùng?

Web Workers chạy JavaScript trong background thread riêng biệt, không block main thread. Giao tiếp qua postMessage. Không truy cập được DOM.

Dùng cho: heavy computation (image processing, encryption, data parsing), keeping UI responsive. SharedArrayBuffer cho phép share memory giữa workers.

Web Workers run JavaScript in a separate background thread, not blocking the main thread. Communication is via postMessage. They cannot access the DOM.

Use for: heavy computation (image processing, encryption, data parsing), keeping the UI responsive. SharedArrayBuffer allows sharing memory between workers.