WebSocket的优势AJAX与PHP的简单应用 [英] Websocket advantages over AJAX for simple applications with PHP
问题描述
我用了一下AJAX与PHP对于像提交表单和我最近开始寻找到的WebSockets。我跟着本教程，以了解的基础知识。从我收集，的WebSockets保持连接打开，而AJAX打开和关闭的请求。
I've used a bit of AJAX with PHP for things like submitting forms and I've recently started looking into websockets. I followed this tutorial to understand the basics. From what I gather, websockets keep the connection open whereas AJAX opens and closes a request.
我的问题是这样做的WebSockets提供任何优势AJAX如果你只是提交表单或类似auto_complete简单的任务（其中有一个jQuery插件呢）？也许本教程是不是最大的，但它好像有一个更多的code参与让WebSockets的工作（至少在PHP）赫克不仅仅是一个简单的AJAX调用（或使用jQuery捆绑了它） 。我读过的一些地方，这是一个有点快，但如果我工作的东西，是不是收到请求吨，将它真正发挥作用？纠正我，如果我错了，但不是所有的浏览器都支持WebSockets的两种，对吧？
My question is do websockets provide any advantage over AJAX if you're just submitting forms or simple tasks like auto_complete (which there's a jQuery plugin for anyway)? Maybe the tutorial isn't the greatest, but it seems like there's a heck of a lot more code involved to get websockets to work(at least with PHP) than just a simple AJAX call (or using jQuery which bundles it). I've read in a few places that it's a bit quicker, but if I'm working on something that isn't receiving tons of requests, will it really make a difference? Correct me if I'm wrong, but not all browsers support websockets either, right?
推荐答案
的WebSockets有两方面的优势。
Websockets have two advantages.
-
它们具有少得多的开销，这导致了更好的网络性能
they have much less overhead, which results in a better network performance
他们让服务器发送该客户端还没有明确地请求的数据。
they allow the server to send data which the client hasn't explicitely requested.
第二个是最重要的优势。
The second one is the most important advantage.
在AJAX，一切服务器发送必须响应客户端一个previous请求，每次请求只能使用一次回答。但在许多应用中，尤其是多用户应用，事件发生在服务器上与这些事件必须立即推送到客户端。有在AJAX变通办法，如延迟回答一个请求，直到有一些报道（长轮询），但这些都是非常脏。这就是为什么有WebSockets的。用的websocket连接时，服务器可以发送消息给当它要和它希望作为经常的客户端，而无需等待来自客户端的请求。
In AJAX, everything the server sends must be the response to a previous request by the client, and every request can only be answered once. But in many applications, especially multi-user applications, events happen on the server and these events must be pushed to the clients immediately. There are workarounds for that in AJAX, like delaying the answer to a request until there is something to report (long-polling), but these are quite dirty. That's why there are Websockets. With a websocket connection, the server can send messages to the clients when it wants and as often as it wants, without having to wait for a request from the client.
不过遗憾的是WebSockets的也有缺点：
But unfortunately WebSockets also have disadvantages:
- 在他们没有很好地支持Web开发框架（尚未！）
- 不是所有的浏览器都支持它（但大多数桌面浏览器已经做）
- 许多代理和反向代理服务器不能中继的WebSocket流量（尚未！）
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