socket.io常见用法
io.on('connect', onConnect);
function onConnect(socket){
// 只发给sender。 sending to the client
socket.emit('hello', 'can you hear me?', 1, 2, 'abc');// 发给所有人,除了sender。 sending to all clients except sender
socket.broadcast.emit('broadcast', 'hello friends!');// 发给game房间所有人,除了sender。 sending to all clients in 'game' room except sender
socket.to('game').emit('nice game', "let's play a game");// 发给game1和/或game2所有人,除了sender。 sending to all clients in 'game1' and/or in 'game2' room, except sender
socket.to('game1').to('game2').emit('nice game', "let's play a game (too)");// 发给game房间所有人,包含sender。 sending to all clients in 'game' room, including sender
io.in('game').emit('big-announcement', 'the game will start soon');// 发给域名myNamespacs所有人,包含sender。 sending to all clients in namespace 'myNamespace', including sender
io.of('myNamespace').emit('bigger-announcement', 'the tournament will start soon');// 发给域名myNamespace里room房间的所有人,包含sender。 sending to a specific room in a specific namespace, including sender
io.of('myNamespace').to('room').emit('event', 'message');// 发给某一个人 sending to individual socketid (private message)
io.to(`${socketId}`).emit('hey', 'I just met you');// WARNING: `socket.to(socket.id).emit()` will NOT work, as it will send to everyone in the room
// named `socket.id` but the sender. Please use the classic `socket.emit()` instead.// sending with acknowledgement
socket.emit('question', 'do you think so?', function (answer) {});// sending without compression
socket.compress(false).emit('uncompressed', "that's rough");// sending a message that might be dropped if the client is not ready to receive messages
socket.volatile.emit('maybe', 'do you really need it?');// specifying whether the data to send has binary data
socket.binary(false).emit('what', 'I have no binaries!');// sending to all clients on this node (when using multiple nodes)
io.local.emit('hi', 'my lovely babies');// sending to all connected clients
io.emit('an event sent to all connected clients');};