问题描述
我在Ubuntu 11.04中运行Firefox 7，我注意到socket.io从web套接字回退到xhr-polling，所以我在Firefox的控制台中输入了 WebSocket ，并得到了pre $参考错误：WebSocket没有定义
在Google Chrome 14中，我得到了
WebSocket
函数WebSocket（）{[native code]}
根据，自从Firefox 4以来，WebSockets得到了部分支持，并且自从Firefox 6以来得到了全面支持。
$ b $在Firefox 4/5中，WebSockets支持存在，但是禁用了（通过about：config激活）。在Firefox 6中，Mozilla默认启用了WebSockets，但添加了Moz前缀。另外请注意，Firefox 6使用较新的HyBi协议和W3C API。 Chrome在Chrome 14中增加了HyBi协议，尽管Chrome从未使用过前缀。
该协议已经完成，官方第一个版本预计将在6周内发布（电线格式在几个月内没有明显改变）。这个API也已经相当稳定了好几个月，Chrome 14+和Firefox 6+基本上都有相同的API实现。出于某种原因，Mozilla选择比WebSocket前缀更加谨慎。也许这是谷歌对前缀不稳定的API不够谨慎的反应。除非您对二进制消息支持，特定的错误和关闭条件处理或子协议感兴趣选择，那么自从Chrome几年前推出以来，WebSockets API基本上是相同的。如果你正在实现一个WebSocket服务器，那么你需要知道在过去的两年中发生了重大变化的协议的各种版本。
I'm running Firefox 7 in Ubuntu 11.04, and I noticed socket.io was falling back from web sockets to xhr-polling, so I typed WebSocket in Firefox's console, and got
[00:48:21.224] ReferenceError: WebSocket is not defined
On Google Chrome 14 I got
WebSocket
function WebSocket() { [native code] }
According to this, WebSockets is partly supported since firefox 4 and fully supported since firefox 6.
Is it only different in firefox on linux ?
In Firefox 4/5, WebSockets support is present but disabled (activated via about:config). In Firefox 6, Mozilla enabled WebSockets by default but added the "Moz" prefix. Also, note that Firefox 6 uses the newer HyBi protocol and W3C API. Chrome added the HyBi protocol in Chrome 14 although Chrome has never used a prefix.
The protocol is effectively complete and the official first version is expected to be published in about 6 weeks (the wire format has not changed significantly in months). The API has also been quite stable for months and Chrome 14+ and Firefox 6+ basically have the same implementation of the API. For some reason Mozilla has chosen to be even more cautious than normal with WebSockets prefixing. Perhaps it is a reaction to Google not being careful enough about prefixing unstable APIs.
Unless you are interested in binary message support, specific error and close condition handling or sub-protocol selection, then the WebSockets API has been essentially the same since Chrome introduced it a couple of years ago. If you are implementing a WebSockets server then you will need to know about the various versions of the protocol which has seen significant changes in the past 2 years.
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