PhantomJS example

test.js

// ----------------------------------------------------------------------------
// Page object setup
// ----------------------------------------------------------------------------

var page = new WebPage();

page.onConsoleMessage = function(msg) {
    console.log(msg);
};

page.open(encodeURI("http://jquery.com/"), function (status) {
    page.evaluate(test);
    phantom.exit();
});

// ----------------------------------------------------------------------------
// Test section
// ----------------------------------------------------------------------------

function test() {
    console.log($("div").length);
}