如何解决socket.io 房间字典中的房间是“未定义”吗? 检查房间是否已经存在加入房间
所以我从我的客户端发出一个事件,该事件发送一个包含我试图连接到的套接字/房间 ID 的字符串。收到数据后,由服务器端的这段代码进行处理:
const express = require('express');
const app = express();
const http = require('http').Server(app);
const io = require('socket.io')(http);
const port = process.env.PORT || 3000;
app.use(express.static(__dirname + '/public'));
//runs when the user connects to the server
function onConnection(socket){
console.log('a user connected');
// socket.join('some room');
console.log('Created Room: ' + socket.id);
socket.emit("RoomID",socket.id);
socket.on("location",(receivedString) => {
// socket.emit("RoomID",socket.id);
socket.to(socket.id).emit("redirectLocation",receivedString);
console.log('\nReceived the following data from socket "' + socket.id + '": ' + receivedString);
console.log('The amount of people in this room is ' + io.sockets.adapter.rooms.get(socket.id).size + '.');
});
//runs when the user is trying to join a specific room
socket.on("joinRoom",(roomIdentifier) => {
console.log('The room identifier is: ' + roomIdentifier);
console.log('The room is already in the rooms array: ' + io.sockets.adapter.rooms[String(roomIdentifier)]);
if (io.sockets.adapter.rooms[roomIdentifier]) {
socket.join(roomIdentifier);
} else {
console.log(socket.id + 'tried to join ' + roomIdentifier + 'but the room does not exist.');
};
});
socket.on('disconnect',onDisconnection);
}
//runs when the user disconnects from the server
function onDisconnection(socket){
console.log('a user disconnected');
}
//runs when the socket manager registers a connection
io.on('connection',onConnection);
//Runs when a new room was created
io.of("/").adapter.on("create-room",(room) => {
console.log(`room ${room} was created`);
});
io.of("/").adapter.on("join-room",(room,id) => {
console.log(`socket ${id} has joined room ${room}`);
});
http.listen(port,() => console.log('listening on port ' + port));
我不知道为什么它显示为未定义——我想可能是因为房间字典不应该有一个字符串或其他东西作为键,但我真的不确定。
解决方法
分享的代码有两个问题:
检查房间是否已经存在
以下命令显示 io.sockets.adapter.rooms
是 JavaScript Map
object。
console.log(io.sockets.adapter.rooms)
// returns [object Map]
要检查 Map 是否包含房间名称,则应使用 Map.has(key)
而不是 Map[key]
:
io.sockets.adapter.rooms.has(roomIdentifier)
一旦房间存在检查如上修改,代码仍然无法让用户加入房间,如下所述。
加入房间
if
语句允许用户仅在房间已经存在时加入房间,否则不执行任何操作。因此,永远不会创建房间,因此任何用户都无法加入其中任何一个。
if (io.sockets.adapter.rooms.has(roomIdentifier]) {
socket.join(roomIdentifier);
} else {
console.log(socket.id + 'tried to join ' + roomIdentifier + 'but the room does not exist.');
// Socket.join is not executed,hence the room not created.
};
socket.join
应该在 if
语句之外执行。 if
语句可能可以从代码中删除,除非需要根据它采取某些特定操作。
if (io.sockets.adapter.rooms.has(roomIdentifier]) {
// action when room already exists
} else {
console.log(socket.id + 'tried to join ' + roomIdentifier + 'but the room does not exist.');
// action when room is new
};
// join the room in any case
socket.join(roomIdentifier);
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。