WebSocket traffic sniffer

gistfile1.js

(function () {
	WebSocket.prototype._send = WebSocket.prototype.send;
	WebSocket.prototype.send = function (data) {
		this._send(data);
		this.addEventListener('message', function (msg) {
			console.log('>> ' + msg.data);
		}, false);
		this.send = function (data) {
			this._send(data);
			console.log("<< " + data);
		};
		console.log("<< " + data);
	}
})()

How I send a custom data from this code?
Example:
var data = {"name": "subscribeEvent", "msg": {"name": "custom", "data": ""}}; this.send(data);