如何在socket.io中的断开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。

这个文件处理一些主要的客户端事件，其中之一是断开事件。

断开连接事件的代码如下：

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);
    }
    });
});

此断开连接命令应该通知所有其他客户端有关断开连接的播放器并删除有关它的数据。

这里是保存活跃玩家临时数据的代码：

/* 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刚断开连接的玩家的套接字 ID。

这是处理 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);
});

如果有人能找出问题，请告诉我，请告诉我断开连接事件和其他事件的实际工作原理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);
});