Javascript 如何在客户端获取连接的socket.id？
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how to get socket.id of a connection on client side?
提问by Black Heart
Im using the following code in index.js
我在 index.js 中使用以下代码
io.on('connection', function(socket){
console.log('a user connected');
console.log(socket.id);
});
the above code lets me print the socket.id in console.
上面的代码让我在控制台中打印 socket.id。
But when i try to print the socket.id on client side using the following code
但是当我尝试使用以下代码在客户端打印 socket.id 时
<script>
var socket = io();
var id = socket.io.engine.id;
document.write(id);
</script>
it gives 'null' as output in the browser.
它在浏览器中给出“null”作为输出。
回答by Sayuri Mizuguchi
You should wait for the event connectbefore accessing the idfield:
您应该connect在访问该id字段之前等待事件：
With this parameter, you will access the sessionID
使用此参数，您将访问 sessionID
socket.id
Edit with:
编辑：
Client-side:
客户端：
var socketConnection = io.connect();
socketConnection.on('connect', function() {
const sessionID = socketConnection.socket.sessionid; //
...
});
Server-side:
服务器端：
io.sockets.on('connect', function(socket) {
const sessionID = socket.id;
...
});
回答by Sandeep Joel
For Socket 2.0.4 users
对于 Socket 2.0.4 用户
Client Side
客户端
let socket = io.connect('http://localhost:<portNumber>');
console.log(socket.id); // undefined
socket.on('connect', () => {
console.log(socket.id); // an alphanumeric id...
});
Server Side
服务器端
const io = require('socket.io')().listen(portNumber);
io.on('connection', function(socket){
console.log(socket.id); // same respective alphanumeric id...
}
回答by Black Heart
The following code gives socket.id on client side.
以下代码在客户端提供 socket.id。
<script>
var socket = io();
socket.on('connect', function(){
var id = socket.io.engine.id;
alert(id);
})
</script>
回答by rohit
To get client side socket id for Latest socket.io 2.0 use the code below
要获取最新 socket.io 2.0 的客户端套接字 ID，请使用以下代码
let socket = io();
//on connect Event
socket.on('connect', () => {
//get the id from socket
console.log(socket.id);
});
