node.js 在 Socket.io 客户端获取连接状态
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Get connection status on Socket.io client
提问by franzlorenzon
I'm using Socket.io, and I'd like to know the status of connection to the server from the client-side.
我正在使用Socket.io，我想知道从客户端到服务器的连接状态。
Something like this:
像这样的东西：
socket.status // return true if connected, false otherwise
I need this information to give a visual feedback to the user if the connection has dropped or it has disconnected for any reason.
如果连接断开或由于任何原因断开连接，我需要此信息向用户提供视觉反馈。
回答by robertklep
You can check the socket.connectedproperty:
您可以检查socket.connected属性：
var socket = io.connect();
console.log('check 1', socket.connected);
socket.on('connect', function() {
console.log('check 2', socket.connected);
});
It's updated dynamically, if the connection is lost it'll be set to falseuntil the client picks up the connection again. So easy to check for with setIntervalor something like that.
它是动态更新的，如果连接丢失，它将被设置为false直到客户端再次连接。很容易检查setInterval或类似的东西。
Another solution would be to catch disconnectevents and track the status yourself.
另一种解决方案是捕获disconnect事件并自己跟踪状态。
回答by Ansari Abdullah
You can check whether the connection was lost or not by using this function:-
您可以使用此功能检查连接是否丢失：-
var socket = io( /**connection**/ );
socket.on('disconnect', function(){
//Your Code Here
});
Hope it will help you.
希望它会帮助你。
回答by Ilan
Track the state of the connection yourself. With a boolean. Set it to falseat declaration. Use the various events (connect, disconnect, reconnect, etc.) to reassign the current boolean value. Note: Using undocumented API features (e.g., socket.connected), is not a good idea; the feature could get removed in a subsequent version without the removal being mentioned.
自己跟踪连接状态。带有布尔值。将其设置为falseat 声明。使用各种事件（连接、断开连接、重新连接等）重新分配当前布尔值。注意：使用未记录的 API 功能（例如socket.connected）不是一个好主意；该功能可能会在后续版本中删除，而不会提及删除。
回答by Na Nonthasen
These days, socket.on('connect', ...) is not working for me. I use the below code to check at 1st connecting.
这些天，socket.on('connect', ...) 对我不起作用。我使用以下代码在第一次连接时进行检查。
if (socket.connected)
console.log('socket.io is connected.')
and use this code when reconnected.
并在重新连接时使用此代码。
socket.on('reconnect', ()=>{
//Your Code Here
});
回答by Qiulang
@robertklep's answer to check socket.connected is correct except for reconnect event, https://socket.io/docs/client-api/#event-reconnectAs the document said it is "Fired upon a successful reconnection." but when you check socket.connectedthen it is false.
@robertklep 检查 socket.connected 的答案是正确的，除了重新连接事件，https://socket.io/docs/client-api/#event-reconnect
正如文档所说，它是“成功重新连接时触发”。但是当您检查时，socket.connected它是错误的。
Not sure it is a bug or intentional.
不确定这是一个错误还是故意的。
