8.html

 <!DOCTYPE html>
 <html>
<head>
<title>8.html</title>
</head>
<body>
<h1>8.html</h1>

<p id="hello"> </p>

<script src="/socket.io/socket.io.js"></script>

<script>

var socket =io.connect("/");

socket.on("connected", function(){
  console.log("connected");
});

socket.on("disconnect", function(){
  console.log("disconnected");
});

socket.on("hello",function(num){
    document.getElementById("hello").innerHTML= "Hello World: "+num;
});

</script>

</body>
 </html>