WebsocketClient.js

var url = 'http://sample.com'
var ws = new WebSocket(url);
var msg = "hi, this is simple message.";
ws.onopen = function(evt) {
  ws.send(msg);
};
ws.onmessage = function(evt) {
  // handle this message
  console.log(evt.data);
};
ws.onclose = function(evt) {
  // this channel is closed
};
ws.onerror = function(evt) {
  // handle this error
};