1

(function(){

     2

    var relative_URI = window.location.href.replace(/^http(s?:\/\/[^\/]*)\/.*$/, 'ws$1/ws');

     3

    var ws = new WebSocket(relative_URI);

     4

    ws.onmessage = function (evt) {

     5

        var received_msg = evt.data;

     6

        alert("Message is received..."+received_msg); 

     7

    };

     8

    ws.onopen = function (evt) {

     9

        ws.send("test");

    10

    };

    11

})();