程序的流程圖:

主要代碼:
服務端 app.js
先加載所需要的通信模塊:
var express = require('express'); var app = express(); var http = require('http').createServer(app); var io = require('socket.io').listen(http); var fs = require('fs');
創建用戶列表和消息列表:
var person = []; var history = [];
綁定並監聽80端口:
app.get('/',function (req,res) {
res.sendFile(__dirname + '/login.html');
});
http.listen(80,function () {
console.log('listening on *:80');
});
客戶端連接成功后,觸發響應事件connection,完成要綁定的事件並實現客戶端出發的事件:
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 + '進入房間', time: now(), name: '系統消息'});
});
socket.on('disconnect', function () {
if (user !== '') {
person.forEach(function (value, index) {
if (value === user) {
person.splice(index, 1);
}
});
io.sockets.emit('news', {content: user + '離開房間', time: now(), name: '系統消息'});
io.sockets.emit('updatePerson', person);
}
});
});
客戶端 index.js:
先初始化用戶信息:
$scope.data = []; //消息隊列 $scope.name = ''; //用戶名 $scope.content = ''; //用戶輸入的消息 $scope.personlist = []; //用戶隊列
然后連接服務器端:
const socket_url = 'http://localhost'; var socket = io.connect(socket_url);
連接成功后,對用戶昵稱輸入的驗證:
$scope.checkName = function () { if($scope.name!==''){ if($scope.personlist.length!==0){ if($scope.personlist.indexOf($scope.name)>-1) { document.getElementById("info").textContent = "該昵稱已被占用,請重新輸入"; } else{ socket.emit('setUserName', $scope.name); } } else{ socket.emit('setUserName', $scope.name); } } else{ document.getElementById('name').focus(); } };
驗證成功后,對用戶輸入消息要觸發的事件:
$scope.sendMsg = function(data){ var date = new Date(); data = $scope.content; if($scope.content !== ''){ socket.emit('sendMsg',data); } $scope.content = ''; };
程序的部分運行測試結果:
瀏覽器輸入localhost后展示的用戶登錄界面:

昵稱重復后的提示:

昵稱輸入成功后進入當前用戶的聊天界面:

源碼地址:github
