// test if the browser supports web sockets
if ("WebSocket" in window) {
        debug("Browser supports web sockets!", 'success');
        connect($('#host').val());
        $('#console_send').removeAttr('disabled');
} else {
            debug("Browser does not support web sockets", 'error');
};

<script>
  var wSocket = new WebSocket("ws:yourdomain/demo");
  
  wSocket.onmessage = function(e){  alert(e.data);  }  

  wSocket.onopen = function(e){ alert("서버 연결 완료"); } 
  wSocket.onclose = function(e){ alert("서버 연결 종료"); }  

  function send(){ //서버로 데이터를 전송하는 메서드
    wSocket.send("Hello");
  }
</script>