websocket实现简单聊天程序

程序的流程图：

主要代码：

服务端 app.js

先加载所需要的通信模块：

var express = require('express');

var app = express();

var http = require('http').createServer(app);

var io = require('socket.io').listen(http);

var fs = require('fs');

创建用户列表和消息列表：

var person = [];

var history = [];

绑定并监听80端口：

app.get('/',function (req,res) {

    res.sendFile(__dirname + '/login.html');

});

http.listen(80,function () {

    console.log('listening on *:80');

});

客户端连接成功后，触发响应事件connection，完成要绑定的事件并实现客户端出发的事件：

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

    var user = '';

    socket.emit('history', history);

    io.sockets.emit('updatePerson', person); 

    socket.on('sendMsg', function (data) {

        var obj = {};

        obj.content = data;

        obj.time = now();

        obj.name = user;

        if (history.length === history_num) {

            history.shift();

        }

        history.push(obj);

        io.sockets.emit('news', obj);

    });

    socket.on('setUserName', function (data) {

        user = data;

        person.push(user);

        io.sockets.emit('loginsucess');

        io.sockets.emit('updatePerson', person);

        io.sockets.emit('news', {content: user + '进入房间', time: now(), name: '系统消息'});

    });

    socket.on('disconnect', function () {

        if (user !== '') {

            person.forEach(function (value, index) {

                if (value === user) {

                    person.splice(index, 1);

                }

            });

            io.sockets.emit('news', {content: user + '离开房间', time: now(), name: '系统消息'});

            io.sockets.emit('updatePerson', person);

        }

    });

});

客户端 index.js：

先初始化用户信息：

 $scope.data = [];     //消息队列

 $scope.name = '';    //用户名

 $scope.content = '';  //用户输入的消息

 $scope.personlist = []; //用户队列

然后连接服务器端：

const  socket_url = 'http://localhost';

var socket = io.connect(socket_url);

连接成功后，对用户昵称输入的验证：

$scope.checkName = function () {

    if($scope.name!==''){

        if($scope.personlist.length!==0){

            if($scope.personlist.indexOf($scope.name)>-1) {

                document.getElementById("info").textContent = "该昵称已被占用，请重新输入";

            }

            else{

                socket.emit('setUserName', $scope.name);

            }

        }

        else{

            socket.emit('setUserName', $scope.name);

        }

    }

    else{

        document.getElementById('name').focus();

    }

};

验证成功后，对用户输入消息要触发的事件：

$scope.sendMsg = function(data){

    var date = new Date();

    data = $scope.content;

    if($scope.content !== ''){

        socket.emit('sendMsg',data);

    }

    $scope.content = '';

};