標籤：article date gets osi deb expr UI padding tracking
一直想做一個即時聊天的應用，前幾天看到了socket.io,感覺還不錯。自己略加改動，感覺挺不錯的。官網上給的範例非常easy，以下改進了一點，實現了曆史訊息的推送。
demo地址:chat.codeboy.me
當中server端代碼:
var app = require(‘express‘)();var http = require(‘http‘).Server(app);var io = require(‘socket.io‘)(http);var history = new Array();app.get(‘/‘, function(req, res){ res.sendfile(‘chat.html‘);});io.on(‘connection‘, function(socket){ socket.on(‘chat message‘, function(msg){ io.emit(‘chat message‘, msg); addMsg(msg); }); socket.on(‘login message‘, function(msg){ socket.join(‘history room‘); for(var i=0;i<history.length;i++){ io.in(‘history room‘).emit(‘chat message‘, history[i]); } io.in(‘history room‘).emit(‘chat message‘, ‘lyd__上面是近期的一些資訊‘); socket.leave(‘history room‘); socket.join(‘chat room‘); io.emit(‘chat message‘,msg); addMsg(msg); });});http.listen(3000, function(){ console.log(‘listening on *:3000‘);});function addMsg(msg){ history.push(msg); if(history.length>100) history.shift();};
聊天頁面代碼：
<!doctype html><html> <head> <title>聊天室</title> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { font: 20px Helvetica, Arial; } form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; } form input { border: 0; padding: 10px; width: 90%; } form button { width: 10%; background: rgb(130, 224, 255); border: none; padding: 10px; } #messages { list-style-type: none; margin: 0; padding: 0; } #messages li { padding: 5px 10px 5px 10px; } </style> </head> <body> <ul id="messages"></ul> <form action=""> <input id="m" autocomplete="off" /><button id="btn">登入</button> </form> <script src="/socket.io/socket.io.js"></script> <script src="http://code.jquery.com/jquery-1.11.1.js"></script> <script> var socket = io(); var login =true; var username = "" ; var myDate = new Date(); $(‘form‘).submit(function(){ if(login){ username = $(‘#m‘).val(); if(username.length==0){ alert("請輸入使用者名稱"); return false; } login = false ; socket.emit(‘login message‘, "lyd__<font color=blue>"+username + ‘</font>增加了聊天室 ‘+myDate.getMonth()+"-"+myDate.getDate()+" "+myDate.getHours()+":"+myDate.getMinutes()+":"+myDate.getSeconds()); $(‘#btn‘).html("發送"); }else { socket.emit(‘chat message‘, username +"##"+ $(‘#m‘).val()); } $(‘#m‘).val(‘‘); return false; }); socket.on(‘chat message‘, function(msg){ var item = msg.split("##",2); if(msg.indexOf(‘lyd__‘)==0) $(‘#messages‘).append(‘<li style="text-align:center; font-size:12px;margin-top:1px; color:red; background-color:#eee;">‘ +msg.substr(5)+‘</li>‘); else if(msg.indexOf(username)==0){ $(‘#messages‘).append(‘<li style="text-align:right; font-size:12px; color:red;">‘+item[0]+‘:</li>‘); $(‘#messages‘).append(‘<li style="text-align:right;padding-top:0px; padding-left:30%;color:purple;">‘+item[1]+‘</li>‘); }else { $(‘#messages‘).append(‘<li style="text-align:left;font-size:12px; color:red;">‘+item[0]+‘:</li>‘); $(‘#messages‘).append(‘<li style="text-align:left;padding-top:0px; padding-right:30%; color:purple;">‘+item[1]+‘</li>‘); } }); </script> </body></html>
nodejs即時聊天
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