什么是使用JavaScript来检测的WebSocket支持的最佳方法是什么？ [英] What is the best way to detect websocket support using Javascript?

问题描述

我想使用JavaScript如果Web浏览器支持WebSockets的检测，但只使用基于特征的检测，我越来越误报，所以我增加了一个用户代理测试抛出了Android设备，而不是，这是我又不是高兴的事情。我有一个三星Galaxy Tab 2，这是我的检测code：

I'm trying to use Javascript to detect if a web browser supports websockets, but using only feature-based detection, I'm getting false positives, so I added a user agent test to throw out Android devices instead, which I'm not happy about. I have a Samsung Galaxy Tab 2, and here's my detection code:

var isSupported = (("WebSocket" in window && window.WebSocket != undefined) ||
                   ("MozWebSocket" in window));

/* This line exists because my Galaxy Tab 2 would otherwise appear to have support. */
if (isSupported && navigator.userAgent.indexOf("Android") > 0)
  isSupported = false;

if (isSupported)
  document.write("Your browser supports websockets");
else
  document.write("Your browser does not support websockets");

这code似乎与IE浏览器，火狐，Safari浏览器（包括iPhone / iPad的）和Chrome的工作。然而，基于特征的检查，返回true，当我用我的三星Galaxy Tab 2，这是不正确，因为该浏览器实际上并不支持的WebSockets的默认浏览器。此外，我不知道有多少其他Android设备如何有这个同样的问题，所以在目前，这是最好的解决方案，我所知道的检测。

This code seems to work with IE, Firefox, Safari (including iPhone/iPad), and Chrome. However, the feature-based check is returning true when I use the default browser of my Samsung Galaxy Tab 2, which is incorrect because that browser does not actually support websockets. Furthermore, I don't know how many other Android devices have this same issue, so at the moment, this is the best solution I'm aware of for detection.

有没有更好的方法来检测WebSocket的支持，比我在做什么其他的？我也认识到，解决方法Android的存在，如使用不同的浏览器，这意味着我的用户代理检测code原样不会是一件好事。我的目标是不是还得靠摆在首位的用户代理。

Is there a better way to detect websocket support other than what I'm doing? I do realize that workarounds exist for Android, such as using a different browser, which means my user agent detection code as-is would not be a good thing. My goal is to not have to rely on the user agent in the first place.

有什么建议？

推荐答案

我觉得Modernizr的图书馆是你在找什么： HTTP ：//modernizr.com/

I think the Modernizr library is what you are looking for: http://modernizr.com/

一旦你有你的页面上的图书馆，你可以使用一个简单的检查，如：

Once you include the library on your page, you can use a simple check like:

if(Modernizr.websockets){
    // socket to me baby
}

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