[example] Add disconnection/reconnection logs to the chat example (so…

…cketio#2675)

examples/chat/README.md

@@ -10,7 +10,7 @@ $ cd socket.io
 $ npm install
 $ cd examples/chat
 $ npm install
-$ node .
+$ npm start
 ```
 
 And point your browser to `http://localhost:3000`. Optionally, specify

examples/chat/package.json

@@ -8,5 +8,8 @@
   "license": "BSD",
   "dependencies": {
     "express": "4.13.4"
+  },
+  "scripts": {
+    "start": "node index.js"
   }
 }

examples/chat/public/main.js

@@ -263,4 +263,20 @@ $(function() {
   socket.on('stop typing', function (data) {
     removeChatTyping(data);
   });
+
+  socket.on('disconnect', function () {
+    log('you have been disconnected');
+  });
+
+  socket.on('reconnect', function () {
+    log('you have been reconnected');
+    if (username) {
+      socket.emit('add user', username);
+    }
+  });
+
+  socket.on('reconnect_error', function () {
+    log('attempt to reconnect has failed');
+  });
+
 });