Master AJAX, JSONP, SSE & WebSocket: Complete Front‑End Communication Guide
This article walks through the evolution of front‑end communication techniques—from classic AJAX to JSONP, Server‑Sent Events, and WebSocket—explaining their principles, differences, and providing concise code demos for each method.
AJAX
AJAX dramatically improves web performance by eliminating full‑page refreshes. The basic workflow consists of six steps: create an XHR object, listen for the request, set the callback, configure parameters, send the XHR, and handle the response.
Create XHR object
Listen for request
Set callback
Set parameters
Send XHR
Execute callback with received data
Below is a simple code illustration.
jQuery’s $.ajax function offers additional compatibility and features.
JSONP
JSONP (JSON with Padding) solves cross‑domain requests by leveraging the src attribute of a
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Tencent IMWeb Frontend Team
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