var onOpen = function() { console.log("Socket opened."); socket.send("Hi, Server!"); }, onClose = function() { console.log("Socket closed."); }, onMessage = function(data) { console.log("We get signal:"); console.log(data); }, onError = function() { console.log("We got an error."); }, socket = new WebSocket("ws://echo.websocket.org/"); socket.onopen = onOpen; socket.onclose = onClose; socket.onerror = onError; socket.onmessage = onMessage;