var ws = new WebSocket("ws://localhost:8080");

ws.onopen = function() {
    ws.send("hello");
};

ws.onmessage = function (e) {
    console.log(e.data);
};

ws.onclose = function() {
    console.log("closed...");
};

ws.onerror = function () {
    console.log(this.readyState);
}