所以我从客户端发出一个事件，该事件发送一个包含我试图连接到其中的套接字/roomID的字符串。当接收到数据时，它由服务器端的以下代码处理:
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rooms字典不应该有字符串或其他东西作为键，但我真的不确定。
共享的代码有两个问题:
检查房间是否已经存在
下面的命令显示io.sockets.adapter.rooms是一个JavaScriptMap对象。
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)
一旦像上面那样调整了房间存在检查，代码仍然不能让用户加入房间，如下所述。
加入房间
if语句只允许用户加入一个已经存在的房间，否则不执行任何操作。因此，永远不会创建房间，因此没有用户可以加入任何房间。
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语句可以从代码中删除，除非需要根据它采取一些特定的操作。
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);
尝试使用io.sockets.adapter.rooms.get(roomId)io.sockets.adapter.rooms返回Map Object所以使用io.sockets.adapter.rooms[roomId]返回undefined.