修改注释

ussocket.htm

@@ -13,8 +13,8 @@
         var socket = io.connect('http://127.0.0.1:888');
         //var socket = io.connect('http://lt.1473.cn');
         // TODO 这里负责接收服务端信息的代码
-        socket.on('bcast', function (msg) {
-            document.getElementById("box").innerHTML+=msg;
+        socket.on('bcast', function (r) {
+            document.getElementById("box").innerHTML+=r.msg+'<br>';
         });
         function sendMsg() {
             var input = document.getElementById('txtInput');

uswebsocket.js

@@ -1,14 +1,25 @@
 //引用http和socket.io模块
 var us = {}
+//包含http模块
 us.http = require('http');
+//包含socket.io模块
 var socketio = require('socket.io');
+//创建httpserver
 us.app = us.http.createServer(function (req, res) {});
-//服务开始监听
-us.app.listen(888);
+//开启888端口，服务开始监听
+//us.app.listen(888);
+const hostname="127.0.0.1";
+const port=888;
+us.app.listen(port, hostname);
+console.log(`Server running at http://${hostname}:${port}/`);
+//也可以采用下面的写法,但代码更多
+/*us.app.listen(port, hostname, function() {
+    console.log(`Server running at http://${hostname}:${port}/`);
+});*/
 //输出调试信息
 //console.log("Http Server start at 888");
 
-//socketio开始监听
+//socketio开始监听http请求
 us.socketio = socketio.listen(us.app);
 
 //webSocket协议握手成功
@@ -20,7 +31,7 @@ us.socketio.sockets.on('connection', function (socket) {
         console.log('Get a msg from client ...');
         //console.log(data);
         //向客户端javascript发送广播,注意：这里广播消息为bcast，
-        //则前端javascript用socket.on('bcast', function (msg) {alert(msg); });接收消息
+        //则前端javascript用socket.on('bcast', function (r) {alert(r); });接收消息
         socket.broadcast.emit('bcast', data);
     });
     //console.log("WebSocket connect ok....");