You should start by setting up a server to serve requests. I use expressjs for this - http://expressjs.com/
This will allow you to run nodejs as a web application.
Setup a route in express JS to serve your data - http://expressjs.com/api.html#express
var express = require('express');var app = express();app.get('/data', function(req, res){ res.send('hello world'); //replace with your data here});app.listen(3000);
Open up a browser, and type in http://MY_SERVER_ADDR:3000/data
and you should see your output there.
Next, you'll need to attach an event handler to your HTML file that will trigger a $.get() request when it is triggered. Add the previous url to your data in your $.get call and do something with it.
$('.my_selector').click(function(){ $.get('http://MY_SERVER_ADDR:3000/data', {}, function(data){ console.log(data) });});
That should get you going.