js节点-socket.io聊天修改

Posted 2023-03-08

【中文标题】js节点-socket.io聊天修改

【英文标题】：Js node - socket.io chat modificaion

【发布时间】：2012-05-22 09:33:11

【问题描述】：

这是一个简单的聊天示例。如何修改脚本以便：

前5s，第一个用户可以发消息，接下来的5s，用户不能发消息 在接下来的 5s 内（当第一个用户无法发送消息时），第二个用户可以发送消息，第一个用户得到一个 div (apIdv1) 来显示 index.html：

<script src="/socket.io/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script>
    var socket = io.connect('http://localhost:8080');

    // on connection to server, ask for user's name with an anonymous callback
    socket.on('connect', function()
        // call the server-side function 'adduser' and send one parameter (value of prompt)
        socket.emit('adduser', prompt("What's your name?"));
    );

    // listener, whenever the server emits 'updatechat', this updates the chat body
    socket.on('updatechat', function (username, data) 

        $('#conversation').append('<b>'+username + ':</b> ' + data + '<br>');
    );

    // listener, whenever the server emits 'updaterooms', this updates the room the client is in
    socket.on('updaterooms', function(rooms, current_room) 
        $('#rooms').empty();
        $.each(rooms, function(key, value) 
            if(value == current_room)
                $('#rooms').append('<div>' + value + '</div>');
            
            else 
                $('#rooms').append('<div><a href="#" onclick="switchRoom(\''+value+'\')">' + value + '</a></div>');
            
        );
    );

    function switchRoom(room)
        socket.emit('switchRoom', room);
    

    // on load of page
    $(function()
        // when the client clicks SEND
        $('#datasend').click( function() 
            var message = $('#data').val();
            $('#data').val('');
            // tell server to execute 'sendchat' and send along one parameter
            socket.emit('sendchat', message);
        );

        // when the client hits ENTER on their keyboard
        $('#data').keypress(function(e) 
            if(e.which == 13) 
                $(this).blur();
                $('#datasend').focus().click();
            
        );
    );

</script>

<style type="text/css">
#apDiv1 
    position:absolute;
    width:200px;
    height:115px;
    z-index:1;
    left: 150px;
    top: 20px;
    background-color: #FF9900;
    display:none;

</style>

<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;">
    <b>ROOMS</b>
    <div id="rooms"></div>
</div>
<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;">
    <div id="conversation"></div>
    <input id="data" style="width:200px;" />
    <input type="button" id="datasend" value="send" />
</div>
<div id="apDiv1"></div>

app.js

var app = require('express').createServer()
var io = require('socket.io').listen(app);

app.listen(8080);

// routing
app.get('/', function (req, res) 
  res.sendfile(__dirname + '/index.html');
);

// usernames which are currently connected to the chat
var usernames = ;

// rooms which are currently available in chat
var rooms = ['room1','room2','room3'];

io.sockets.on('connection', function (socket) 

    // when the client emits 'adduser', this listens and executes
    socket.on('adduser', function(username)
        // store the username in the socket session for this client
        socket.username = username;
        // store the room name in the socket session for this client
        socket.room = 'room1';
        // add the client's username to the global list
        usernames[username] = username;
        // send client to room 1
        socket.join('room1');
        // echo to client they've connected
        socket.emit('updatechat', 'SERVER', 'you have connected to room1');
        // echo to room 1 that a person has connected to their room
        socket.broadcast.to('room1').emit('updatechat', 'SERVER', username + ' has connected to this room');
        socket.emit('updaterooms', rooms, 'room1');
    );

    // when the client emits 'sendchat', this listens and executes
    socket.on('sendchat', function (data) 
        // we tell the client to execute 'updatechat' with 2 parameters
        io.sockets.in(socket.room).emit('updatechat', socket.username, data);
    );

    socket.on('switchRoom', function(newroom)
        // leave the current room (stored in session)
        socket.leave(socket.room);
        // join new room, received as function parameter
        socket.join(newroom);
        socket.emit('updatechat', 'SERVER', 'you have connected to '+ newroom);
        // sent message to OLD room
        socket.broadcast.to(socket.room).emit('updatechat', 'SERVER', socket.username+' has left this room');
        // update socket session room title
        socket.room = newroom;
        socket.broadcast.to(newroom).emit('updatechat', 'SERVER', socket.username+' has joined this room');
        socket.emit('updaterooms', rooms, newroom);
    );

    // when the user disconnects.. perform this
    socket.on('disconnect', function()
        // remove the username from global usernames list
        delete usernames[socket.username];
        // update list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
        // echo globally that this client has left
        socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
        socket.leave(socket.room);
    );
);

如何将前 5 秒的 apDiv1 显示给一个用户，然后让它消失，反之亦然给第二个用户？

更新答案：

为什么这现在不起作用？

app.js

var app = require('express').createServer()
var io = require('socket.io').listen(app);

app.listen(8080);

// routing
app.get('/', function (req, res) 
  res.sendfile(__dirname + '/index.html');
);

// usernames which are currently connected to the chat
var usernames = ;

// rooms which are currently available in chat
var rooms = ['room1','room2','room3'];

io.sockets.on('connection', function (socket) 

    // when the client emits 'adduser', this listens and executes
    socket.on('adduser', function(username)
        // store the username in the socket session for this client
        socket.username = username;
        // store the room name in the socket session for this client
        socket.room = 'room1';
        // add the client's username to the global list
        usernames[username] = username;
        // send client to room 1
        socket.join('room1');
        // echo to client they've connected
        socket.emit('updatechat', 'SERVER', 'you have connected to room1');
        // echo to room 1 that a person has connected to their room
        socket.broadcast.to('room1').emit('updatechat', 'SERVER', username + ' has connected to this room');
        socket.emit('updaterooms', rooms, 'room1');
    );

    // when the client emits 'sendchat', this listens and executes
    socket.on('sendchat', function (data) 
        // we tell the client to execute 'updatechat' with 2 parameters
        io.sockets.in(socket.room).emit('updatechat', socket.username, data);
    );

    socket.on('switchRoom', function(newroom)
        // leave the current room (stored in session)
        socket.leave(socket.room);
        // join new room, received as function parameter
        socket.join(newroom);
        socket.emit('updatechat', 'SERVER', 'you have connected to '+ newroom);
        // sent message to OLD room
        socket.broadcast.to(socket.room).emit('updatechat', 'SERVER', socket.username+' has left this room');
        // update socket session room title
        socket.room = newroom;
        socket.broadcast.to(newroom).emit('updatechat', 'SERVER', socket.username+' has joined this room');
        socket.emit('updaterooms', rooms, newroom);
    );
    function redLightGreenLight() 
   socket1.emit('redLight');
   socket2.emit('greenLight');


setTimer('redLightGreenLight()', 5000);
    // when the user disconnects.. perform this
    socket.on('disconnect', function()
        // remove the username from global usernames list
        delete usernames[socket.username];
        // update list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
        // echo globally that this client has left
        socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
        socket.leave(socket.room);
    );
);

index.html

<script src="/socket.io/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script>
    var socket = io.connect('http://localhost:8080');

    // on connection to server, ask for user's name with an anonymous callback
    socket.on('connect', function()
        // call the server-side function 'adduser' and send one parameter (value of prompt)
        socket.emit('adduser', prompt("What's your name?"));
    );

    // listener, whenever the server emits 'updatechat', this updates the chat body
    socket.on('updatechat', function (username, data) 
        $('#conversation').append('<b>'+username + ':</b> ' + data + '<br>');
    );

    // listener, whenever the server emits 'updaterooms', this updates the room the client is in
    socket.on('updaterooms', function(rooms, current_room) 
        $('#rooms').empty();
        $.each(rooms, function(key, value) 
            if(value == current_room)
                $('#rooms').append('<div>' + value + '</div>');
            
            else 
                $('#rooms').append('<div><a href="#" onclick="switchRoom(\''+value+'\')">' + value + '</a></div>');
            
        );
    );

    function switchRoom(room)
        socket.emit('switchRoom', room);
    
*socket.on('greenLight', function (data) 
    // change div to enable sending a message
);
socket.on('redLight', function (data) 
    // change div to index.html*
);
    // on load of page
    $(function()
        // when the client clicks SEND
        $('#datasend').click( function() 
            var message = $('#data').val();
            $('#data').val('');
            // tell server to execute 'sendchat' and send along one parameter
            socket.emit('sendchat', message);
        );

        // when the client hits ENTER on their keyboard
        $('#data').keypress(function(e) 
            if(e.which == 13) 
                $(this).blur();
                $('#datasend').focus().click();
            
        );
    );

</script>
<style type="text/css">
#greenLight 
    position:absolute;
    width:200px;
    height:115px;
    z-index:1;
    left: 150px;
    top: 20px;
    background-color: #FF9900;
    display:none;

</style>

<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;">
    <b>ROOMS</b>
    <div id="rooms"></div>
</div>
<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;">
    <div id="conversation"></div>
    <input id="data" style="width:200px;" />
    <input type="button" id="datasend" value="send" />
</div>
***<div id="greenLight"></div>***

【问题讨论】：

那么当计数器 > 0 时我如何阻止用户

【参考方案1】：

Quoth beginerplus，“也许让服务器更好地完成工作......如何更改我的脚本来做到这一点？请在答案上写作为示例”：

在服务器上：

function redLightGreenLight() 
   socket1.emit('redLight');
   socket2.emit('greenLight');


setTimer('redLightGreenLight()', 5000);

在客户端：

socket.on('greenLight', function (data) 
    // change div to enable sending a message
);
socket.on('redLight', function (data) 
    // change div to index.html
);

【讨论】：

我用你建议的代码更新了我的问题，但错误在哪里？

我正在添加您为我编写的代码，但问题出在哪里？

只是连接丢失，没有消息在按钮单击时从客户端发送到服务器...尝试使用我发布为更新问题的代码

更好的是：我需要把你写的代码放在哪里？也许我把那个代码放在了错误的地方？

我无法为您调试代码，但我可以给您一个提示：您需要将 socket1 和 socket2 设置为客户端连接到服务器时获得的实际套接字。

【参考方案2】：

有两种方式：

服务器在 5 秒后向每个客户端发送一条消息，使用 setTimer（或 setInterval，以防您需要重复）：客户端 #1 不能再发送消息，而客户端 #2 可以。然后每个客户端通过更改 div 内容来处理消息。 每个客户端都单独使用 setTimer 或 setInterval；根据您的用例，这可能具有一些优点，但可能具有计时器不会在完全相同的时间启动的缺点。

【讨论】：

由于网络延迟的差异，这两个事件可能无论如何都不会完美同步。

没错，但对于 #1 来说，时机通常不会那么错误，而且我猜这对于我假设他正在尝试做的事情来说已经足够接近了。学校里没有人告诉我作为一名工程师我会做多少假设和猜测。

#1 可能是一个足够好的解决方案。但如果不是，您的实时要求是什么？不同的时钟需要多接近？

排名第一的解决方案可能更好

我需要最好的同步