blog_websocket_client.js

var WebSocketClient = function(address) {
  var socket = new WebSocket(address);

  socket.onopen = function() {
    console.log("Connection established with " + address);
  };

  socket.onclose = function(event) {
    console.log(event);
  };

  socket.onmessage = function(event) {
    console.log("Received message: " + event.data);
  };

  socket.onerror = function(event) {
    console.log(event);
  };

  socket.isOpen = function() {
    return socket.readyState === WebSocket.OPEN;
  };

  socket.isConnecting = function() {
    return socket.readyState === WebSocket.CONNECTING;
  };

  return socket;
};