WebSocket

最新推荐文章于 2024-11-13 23:29:03 发布

tlx111132

最新推荐文章于 2024-11-13 23:29:03 发布

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本文链接：https://blog.youkuaiyun.com/tlx111132/article/details/26962799

WebSocket API是客户端到服务器的下一代异步通信方法，通过单一TCP套接字使用（不安全）或（安全）协议进行通信。它允许服务器和客户端在任意时间推送消息给对方，不受AJAX（或XHR）的请求限制，支持跨域消息传递，不受域名限制。

What is the WebSocket API?

The WebSocket API is the next generation method of asynchronous communication from client to server. Communication takes place over single TCP socket using the (unsecure) or (secure) protocol and can be used by any client or server application. WebSocket is currently being standardized by the W3C. WebSocket is currently implemented in Firefox 4, Chrome 4, Opera 10.70, and Safari 5.

What's great about the WebSocket API that server and client can push messages to each other at any given time. WebSocket is not limited in its nature the way that AJAX (or XHR) is; AJAX technologies require a request to be made by the client, whereas WebSocket servers and clients can push each other messages. XHR is also limited by domain; the WebSocket API allows cross-domain messaging with no fuss.

AJAX technology was a clever usage of a feature not designed to be used the way it is today. WebSocket was created for the specific purpose of bi-direction message pushing.

WebSocket API Usage

Focusing on the client side API only (because each server side language will have its own API), the following snippet opens a connection, creates event listeners for connect, disconnect, and message events, sends a message back to the server, and closes the connection.

// Create a socket instance
var socket = new WebSocket('ws://localhost:…………………………………………………………………………详细页面：http://www.verydemo.com/demo_c134_i11390.html