如何捕获WebSocket连接中断？

在Firefox（至少）中，如果你按下ESC，它将关闭所有打开的WebSockets连接。
我需要捕获断开连接并再次尝试重新连接。

In Firefox (at least), if you hit ESC, then it will close all open WebSockets connections. I need to capture that disconnection and try to re-connect once it's available again.

这是我试图实现的代码示例，但是没有什么我能弄清楚会抓住错误并允许我优雅地处理它。

Here's an example of the code I've tried to implement, but nothing I can figure out will catch the error and allow me to handle it gracefully.

看看代码： http://jsfiddle.net/w5aAK/

var url = "ws://echo.websocket.org";
    try {
        socket = window['MozWebSocket'] ? new MozWebSocket(url) : new WebSocket(url);
        socket.onopen = function(){
            console.log('Socket is now open.');
        };
        socket.onerror = function (error) {
            console.error('There was an un-identified Web Socket error');
        };
        socket.onmessage = function (message) {
            console.info("Message: %o", message.data);
        };
    } catch (e) {
        console.error('Sorry, the web socket at "%s" is un-available', url);
    }

setTimeout(function(){
    socket.send("Hello World");
}, 1000);

打开控制台并观看输出。

Turn on your console and watch the output.

我在这里做错了，还是因为连接在JS脚本范围之外运行而不可能？

Am I doing something wrong here, or is it just not possible because the connection is running outside of the scope of the JS script?

任何输入都会有帮助。

谢谢！