javascript Socket.io 离线连接服务器
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Socket.io connect with server offline
提问by Adam
How do I detect if the server is offline, or for some other reason cannot connect. My code looks something like this.
如何检测服务器是否脱机，或由于其他原因无法连接。我的代码看起来像这样。
this.socket = io.connect(connectionInfo, {
reconnect:false
});
It does not throw any error, so a try/catch clause is not working.
它不会抛出任何错误，因此 try/catch 子句不起作用。
回答by Kurt Pattyn
Use
利用
this.socket.on("connect", callback)to catch connection eventsthis.socket.on("disconnect", callback)to catch disconnection eventsthis.socket.on("connect_failed", callback)to catch failed connection attemptsthis.socket.io.on("connect_error", callback)to catch if the server is offline
this.socket.on("connect", callback)捕捉连接事件this.socket.on("disconnect", callback)捕捉断线事件this.socket.on("connect_failed", callback)捕获失败的连接尝试this.socket.io.on("connect_error", callback)捕捉服务器是否离线
You can find all events, at https://github.com/LearnBoost/socket.io/wiki/Exposed-events
您可以在https://github.com/LearnBoost/socket.io/wiki/Exposed-events找到所有事件
回答by onok
Since the 1.0 update, connection events are different. read this page for more info: http://socket.io/docs/migrating-from-0-9/
自 1.0 更新以来，连接事件有所不同。阅读此页面了解更多信息：http: //socket.io/docs/migrating-from-0-9/
In my case, i could detect a connection error like so:
就我而言，我可以检测到这样的连接错误：
var manager = io.Manager('http://'+window.location.hostname+':3000', { /* options */ });
manager.socket('/namespace');
manager.on('connect_error', function() {
console.log("Connection error!");
});
this.socket = io.connect('http://'+window.location.hostname+':3000');
回答by Zombi
If your server is offline and Client tries to connect use:
如果您的服务器离线并且客户端尝试连接，请使用：
socket.on('error', function (err) {
console.log(err);
});
So Client knows he can not reach the server.
所以客户端知道他无法访问服务器。
