如何在socket.io中的disconnect事件上获取断开连接的客户端的套接字ID

Question

我已经开始为othello开发一个Web应用程序....在其中我使用node.js和socket.io来处理服务器端代码。它在云中运行server.js文件。

此文件处理一些主要客户端事件，其中一个是disconnect事件。

这是断开连接事件的代码：

io.sockets.on('connection', function(socket) {
    log('Client connection by '+socket.id);
    function log(){
        var array = ['*** Server log Message'];
        for(var i=0; i< arguments.length; i++) {
            array.push(arguments[i]);
            console.log(arguments[i]);
        }
        socket.emit('log', array);
        socket.broadcast.emit('log', array);
    }
    /* disconnect command */
    socket.on('disconnect', function(socket) {
    log(socket);
    log('Client disconnected '+ JSON.stringify(players[socket.id]));
    if('undefined' !== typeof players[socket.id] && players[socket.id]) {
        var username = players[socket.id].username;
        var room = players[socket.id].room;
        var payload = {
            username: username,
            socket_id: socket.id
        };
        delete players[socket.id];
        io.in(room).emit('player_disconnected', payload);
    }
    });
});

此disconnect命令应通知所有其他客户端有关已断开连接的播放器并删除有关它的数据。

这是用于保存活动玩家的临时数据的代码：

/* join_room command */
socket.on('join_room', function(payload) {
    log('\'join_room\' command '+ JSON.stringify(payload));
    if(('undefined' === typeof payload) || !payload) {
        var error_message = 'join_room had no payload, command aborted';
        log(error_message);
        socket.emit('join_room_response', {
            result: 'fail',
            message: error_message
        });
        return;
    }
    var room = payload.room;
    if(('undefined' === typeof room) || !room) {
        var error_message = 'join_room didn\'t specify a room, command aborted';
        log(error_message);
        socket.emit('join_room_response', {
            result: 'fail',
            message: error_message
        });
        return;
    }
    var username = payload.username;
    if(('undefined' === typeof username) || !username) {
        var error_message = 'join_room didn\'t specify a username, command aborted';
        log(error_message);
        socket.emit('join_room_response', {
            result: 'fail',
            message: error_message
        });
        return;
    }

    /* store information about new player */
    players[socket.id] = {};
    players[socket.id].username = username;
    players[socket.id].room = room;
    log(players);

    socket.join(room);

    var roomObject = io.sockets.adapter.rooms[room];

    /* notify others about new player */


    var sumCleints = roomObject.length;
    var data = {
        result: 'success',
        room: room,
        username: username,
        socket_id: socket.id,
        membership: sumCleints
    };
    io.in(room).emit('join_room_response', data);

    for(var socket_in_room in roomObject.sockets) {
        var data = {
            result: 'success',
            room: room,
            username: players[socket_in_room].username,
            socket_id: socket_in_room,
            membership: sumCleints
        };
        socket.emit('join_room_response', data);
    }
    log('join_room success');

    log('Room: '+ room + ' was just joined by '+ username)
});

但问题是它没有。当我记录socket.id时，它返回undefined，我不知道为什么......当我记录套接字本身时，它说：传输关闭。

我的问题是如何获取刚断开连接的播放器的套接字ID。

以下是处理player_disconnected事件的客户端代码：

/* when someone leaves a room */
socket.on('player_disconnected', function(payload) {
    if (payload.result == 'fail') {
        alert(payload.message);
        return;
    }

    if(payload.socket_id == socket_id) {
        return;
    }

    /* Delete all rows for new players that leave */
    var dom_elements = $('.socket_'+payload.socket_id);

    if(dom_elements.length != 0) {
        dom_elements.slideUp(1000);
    }

    var newHTML = '<p>'+payload.username+' has left the lobby</p>';
    var newNode = $(newHTML);
    newNode.hide();
    $('#messages').append(newNode);
    newNode.slideDown(1000);
});

如果有人能解决问题，请告诉我，请告诉我断开连接事件以及其他事件是如何工作的以及它们的参数是什么，因为我在文档中找不到任何有用的信息...提前致谢。

Answer 1

断开连接时，您将使用不同的回调参数覆盖socket变量。试试这个：

/* disconnect command */
socket.on('disconnect', function() {
  console.log(socket.id);
});