var ws = new WebSocket('ws://127.0.0.1:8000/ws');
ws.onopen = function() {
alert("open");
ws.send("WebSocket");
};
ws.onmessage = function(ev) {
alert(ev.data);
};
ws.onclose = function(ev) {
alert("close");
};
ws.onerror = function(ev) {
alert("error");
};
