diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..123ae94
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,27 @@
+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
+node_modules
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8f71f43
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
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+
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diff --git a/README.md b/README.md
index 68ba467..8207a30 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,16 @@
-# 10195501421-finalproject_of_cloud-computing-course
+# whiteboard_by_socket_io
+在线白板，基于socket.io的多人在线协作工具
 
+此项目用于socket.io技术的使用演示
+
+* 1.安装node.js
+* 2.在某个文件夹下执行npm install socket.io
+* 3.将源码拷贝到该文件夹下
+* 4.执行node main.js
+* 5.开两个浏览器访问http://localhost/
+
+目前支持画直线、添加文字、橡皮擦、清空画布功能，可以参考源码自行添加其他功能。
+
+可用于多人在线交流，起到白板的作用。
+
+演示地址：[演示地址](http://zidafone.com/)
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..c9533a3
--- /dev/null
+++ b/index.html
@@ -0,0 +1,167 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <style type="text/css">
+        #c{
+            border: 1px solid red;
+        }
+    </style>
+</head>
+<body>
+    <input type="checkbox" id="er" >橡皮
+    <br>
+    颜色：黑<input type="radio" name="color" value="black" checked>红<input type="radio" name="color" value="red">蓝<input type="radio" name="color" value="blue">
+    <br>
+    <canvas id="c" width="400" height="400"></canvas>
+    <br>
+    <button id="clear">清空画布</button>
+
+    <script src="http://cdn.bootcss.com/jquery/3.0.0-alpha1/jquery.min.js"></script>
+    <script type="text/javascript" src="/socket.io/socket.io.js"></script>
+
+    <script type="text/javascript">
+        var socket = io.connect();
+        //从服务器获得消息
+        socket.on("message", function(msg){
+            dealMsg(msg);
+        });
+        socket.on("load", function(data){
+            for(var i = 0; i < data.msgs.length; i++){
+                var m = data.msgs[i];
+                dealMsg(m);
+            }
+        });
+
+        function dealMsg(msg){
+            if(msg.name == "line"){
+                line(msg.x1, msg.y1, msg.x2, msg.y2, msg.color);
+            }else if(msg.name == "text"){
+                text(msg.x, msg.y, msg.text, msg.color);
+            }else if(msg.name == "eraser"){
+                eraser(msg.x1, msg.y1, msg.x2, msg.y2);
+            }else if(msg.name == "clear"){
+                clear();
+            }
+        }
+        
+        var er = $("#er");
+        var c = $("#c");
+        var cxt = c[0].getContext("2d");
+
+        var drawing = false;
+        var drawStartX = 0;
+        var drawStartY = 0;
+        var drawEndX = 0;
+        var drawEndY = 0;
+
+        var ering = false;
+        var erStartX = 0;
+        var erStartY = 0;
+        var erEndX = 0;
+        var erEndY = 0;
+
+        c.mousedown(function(e){
+            if(!er.is(":checked")){
+                drawStartX = e.pageX - this.offsetLeft;
+                drawStartY = e.pageY - this.offsetTop;
+                drawing = true;
+            }else{
+                erStartX = e.pageX - this.offsetLeft;
+                erStartY = e.pageY - this.offsetTop;
+                ering = true;
+            }
+        });
+
+        c.mouseup(function(e){
+            if(!er.is(":checked")){
+                drawEndX = e.pageX - this.offsetLeft;
+                drawEndY = e.pageY - this.offsetTop;
+                drawing = false;
+                socket.emit("line", {
+                    x1 : drawStartX,
+                    y1 : drawStartY,
+                    x2 : drawEndX,
+                    y2 : drawEndY,
+                    color : color()
+                });
+            }else{
+                erEndX = e.pageX - this.offsetLeft;
+                erEndY = e.pageY - this.offsetTop;
+                ering = false;
+                socket.emit("eraser", {
+                    x1 : erStartX,
+                    y1 : erStartY,
+                    x2 : erEndX,
+                    y2 : erEndY
+                });
+            }
+        });
+
+        c.dblclick(function(e){
+            var tx = e.pageX - this.offsetLeft;
+            var ty = e.pageY - this.offsetTop;
+            var txt = prompt("输入文字");
+            socket.emit("text", {
+                x : tx,
+                y : ty,
+                text : txt,
+                color : color()
+            });
+        });
+
+        $("#clear").click(function(){
+            if(confirm("确定要清空画布？")){
+                socket.emit("clear", {
+
+                });
+            }
+        });
+
+
+        //绘制....
+        //绘制直线
+        function line(x1, y1, x2, y2, c){
+            cxt.strokeStyle = c;
+            cxt.beginPath();
+            cxt.moveTo(x1, y1);
+            cxt.lineTo(x2, y2);
+            cxt.closePath();
+            cxt.stroke();
+        }
+
+        //绘制文字
+        function text(x, y, t, c){
+            cxt.fillStyle = c;
+            cxt.fillText(t, x, y);
+        }
+
+        //橡皮擦（实际是绘制白色的矩形）
+        function eraser(x1, y1, x2, y2){
+            cxt.fillStyle = "#FFFFFF";
+            cxt.fillRect(x1, y1, x2 - x1, y2 - y1);
+        }
+
+        //清空画布
+        function clear(){
+            cxt.clearRect(0, 0, 400, 400);
+        }
+
+
+
+
+        function color(){
+            return $("[name=color]:checked").val();
+        }
+
+
+
+        //网页加载后读取已画图进度
+        $(function(){
+            socket.emit("load",{
+
+            });
+        });
+    </script>
+</body>
+</html>
diff --git a/main.js b/main.js
new file mode 100644
index 0000000..dc78b13
--- /dev/null
+++ b/main.js
@@ -0,0 +1,45 @@
+var app = require("http").createServer(handler);
+var io = require("socket.io")(app);
+var fs = require("fs");
+
+function handler(req, res){
+    var html = fs.readFileSync("index.html", "utf8");
+    res.setHeader("Content-Type", "text/html");
+    res.setHeader("Content-Length", Buffer.byteLength(html, "utf8"));
+    res.end(html);
+}
+
+app.listen(80);
+
+io.on("connection", function(socket){
+    socket.on("line", function(msg){//画线
+        //向客户端发命令
+        msg.name = "line";
+        msgs.push(msg);
+        io.sockets.emit("message", msg);
+    });
+    socket.on("text", function(msg){//文字
+        msg.name = "text";
+        msgs.push(msg);
+        io.sockets.emit("message", msg);
+    });
+    socket.on("eraser", function(msg){//橡皮
+        msg.name = "eraser";
+        msgs.push(msg);
+        io.sockets.emit("message", msg);
+    });
+    socket.on("load", function(msg){//从头画
+        socket.emit("load", {
+            name : "load",
+            msgs : msgs
+        });
+    });
+    socket.on("clear", function(msg){
+        msgs.length = 0;
+        io.sockets.emit("message", {
+            name : "clear"
+        });
+    });
+});
+
+var msgs = [];